platform/kernel/linux-rpi.git
8 years agonvmet-rdma: Fix possible NULL deref when handling rdma cm events
Bart Van Assche [Tue, 1 Nov 2016 16:36:46 +0000 (18:36 +0200)]
nvmet-rdma: Fix possible NULL deref when handling rdma cm events

When we initiate queue teardown sequence we call rdma_destroy_qp
which clears cm_id->qp, afterwards we call rdma_destroy_id, but
we might see a rdma_cm event in between with a cleared cm_id->qp
so watch out for that and silently ignore the event because this
means that the queue teardown sequence is in progress.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
8 years agontb_perf: potential info leak in debugfs
Dan Carpenter [Fri, 14 Oct 2016 07:34:18 +0000 (10:34 +0300)]
ntb_perf: potential info leak in debugfs

This is a static checker warning, not something I'm desperately
concerned about.  But snprintf() returns the number of bytes that
would have been copied if there were space.  We really care about the
number of bytes that actually were copied so we should use scnprintf()
instead.

It probably won't overrun, and in that case we may as well just use
sprintf() but these sorts of things make static checkers and code
reviewers happier.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
8 years agontb: ntb_hw_intel: init peer_addr in struct intel_ntb_dev
Dave Jiang [Thu, 27 Oct 2016 18:06:44 +0000 (11:06 -0700)]
ntb: ntb_hw_intel: init peer_addr in struct intel_ntb_dev

The peer_addr member of intel_ntb_dev is not set, therefore when
acquiring ntb_peer_db and ntb_peer_spad we only get the offset rather
than the actual physical address. Adding fix to correct that.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Allen Hubbe <Allen.Hubbe@emc.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
8 years agontb: make DMA_OUT_RESOURCE_TO HZ independent
Nicholas Mc Guire [Mon, 22 Aug 2016 16:51:36 +0000 (18:51 +0200)]
ntb: make DMA_OUT_RESOURCE_TO HZ independent

schedule_timeout_* takes a timeout in jiffies but the code currently is
passing in a constant which makes this timeout HZ dependent, so pass it
through msecs_to_jiffies() to fix this up.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
8 years agontb_transport: make DMA_OUT_RESOURCE_TO HZ independent
Nicholas Mc Guire [Mon, 22 Aug 2016 16:51:35 +0000 (18:51 +0200)]
ntb_transport: make DMA_OUT_RESOURCE_TO HZ independent

schedule_timeout_* takes a timeout in jiffies but the code currently is
passing in a constant which makes this timeout HZ dependent, so pass it
through msecs_to_jiffies() to fix this up.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
8 years agoNTB: ntb_hw_intel: Fix typo in module parameter descriptions
Wei Yongjun [Mon, 8 Aug 2016 09:48:42 +0000 (09:48 +0000)]
NTB: ntb_hw_intel: Fix typo in module parameter descriptions

Fix typo in module parameter descriptions.

Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Acked-by: Allen Hubbe <Allen.Hubbe@emc.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
8 years agontb_pingpong: Fix db_init parameter description
Wei Yongjun [Mon, 8 Aug 2016 09:48:00 +0000 (09:48 +0000)]
ntb_pingpong: Fix db_init parameter description

Fix 'db_init' parameter description.

Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Acked-by: Allen Hubbe <Allen.Hubbe@emc.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
8 years agonet: ethernet: ixp4xx_eth: fix spelling mistake in debug message
Colin Ian King [Sat, 12 Nov 2016 17:44:06 +0000 (17:44 +0000)]
net: ethernet: ixp4xx_eth: fix spelling mistake in debug message

Trivial fix to spelling mistake "successed" to "succeeded"
in debug message.  Also unwrap multi-line literal string.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoibmvnic: Fix size of debugfs name buffer
Thomas Falcon [Fri, 11 Nov 2016 17:00:46 +0000 (11:00 -0600)]
ibmvnic: Fix size of debugfs name buffer

This mistake was causing debugfs directory creation
failures when multiple ibmvnic devices were probed.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoibmvnic: Unmap ibmvnic_statistics structure
Thomas Falcon [Fri, 11 Nov 2016 17:00:45 +0000 (11:00 -0600)]
ibmvnic: Unmap ibmvnic_statistics structure

This structure was mapped but never subsequently unmapped.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agosfc: clear napi_hash state when copying channels
Bert Kenward [Fri, 11 Nov 2016 15:56:51 +0000 (15:56 +0000)]
sfc: clear napi_hash state when copying channels

efx_copy_channel() doesn't correctly clear the napi_hash related state.
This means that when napi_hash_add is called for that channel nothing is
done, and we are left with a copy of the napi_hash_node from the old
channel. When we later call napi_hash_del() on this channel we have a
stale napi_hash_node.

Corruption is only seen when there are multiple entries in one of the
napi_hash lists. This is made more likely by having a very large number
of channels. Testing was carried out with 512 channels - 32 channels on
each of 16 ports.

This failure typically appears as protection faults within napi_by_id()
or napi_hash_add(). efx_copy_channel() is only used when tx or rx ring
sizes are changed (ethtool -G).

Fixes: 36763266bbe8 ("sfc: Add support for busy polling")
Signed-off-by: Bert Kenward <bkenward@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoLinux 4.9-rc5
Linus Torvalds [Sun, 13 Nov 2016 18:32:32 +0000 (10:32 -0800)]
Linux 4.9-rc5

8 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Sun, 13 Nov 2016 18:28:53 +0000 (10:28 -0800)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull KVM fixes from Paolo Bonzini:
 "ARM fixes.  There are a couple pending x86 patches but they'll have to
  wait for next week"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: arm/arm64: vgic: Kick VCPUs when queueing already pending IRQs
  KVM: arm/arm64: vgic: Prevent access to invalid SPIs
  arm/arm64: KVM: Perform local TLB invalidation when multiplexing vcpus on a single CPU

8 years agoMerge branch 'media-fixes' (patches from Mauro)
Linus Torvalds [Sun, 13 Nov 2016 18:26:05 +0000 (10:26 -0800)]
Merge branch 'media-fixes' (patches from Mauro)

Merge media fixes from Mauro Carvalho Chehab:
 "This contains two patches fixing problems with my patch series meant
  to make USB drivers to work again after the DMA on stack changes.

  The last patch on this series is actually not related to DMA on stack.
  It solves a longstanding bug affecting module unload, causing
  module_put() to be called twice. It was reported by the user who
  reported and tested the issues with the gp8psk driver with the DMA
  fixup patches. As we're late at -rc cycle, maybe you prefer to not
  apply it right now. If this is the case, I'll add to the pile of
  patches for 4.10.

  Exceptionally this time, I'm sending the patches via e-mail, because
  I'm on another trip, and won't be able to use the usual procedure
  until Monday. Also, it is only three patches, and you followed already
  the discussions about the first one"

* emailed patches from Mauro Carvalho Chehab <mchehab@osg.samsung.com>:
  gp8psk: Fix DVB frontend attach
  gp8psk: fix gp8psk_usb_in_op() logic
  dvb-usb: move data_mutex to struct dvb_usb_device

8 years agoMerge tag 'char-misc-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sun, 13 Nov 2016 18:24:08 +0000 (10:24 -0800)]
Merge tag 'char-misc-4.9-rc5' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc fixes from Greg KH:
 "Here are three small driver fixes for some reported issues for
  4.9-rc5.

  One for the hyper-v subsystem, fixing up a naming issue that showed up
  in 4.9-rc1, one mei driver fix, and one fix for parallel ports,
  resolving a reported regression.

  All have been in linux-next with no reported issues"

* tag 'char-misc-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  ppdev: fix double-free of pp->pdev->name
  vmbus: make sysfs names consistent with PCI
  mei: bus: fix received data size check in NFC fixup

8 years agoMerge tag 'driver-core-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 13 Nov 2016 18:22:07 +0000 (10:22 -0800)]
Merge tag 'driver-core-4.9-rc5' of git://git./linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here are two driver core fixes for 4.9-rc5.

  The first resolves an issue with some drivers not liking to be unbound
  and bound again (if CONFIG_DEBUG_TEST_DRIVER_REMOVE is enabled), which
  solves some reported problems with graphics and storage drivers. The
  other resolves a smatch error with the 4.9-rc1 driver core changes
  around this feature.

  Both have been in linux-next with no reported issues"

* tag 'driver-core-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  driver core: fix smatch warning on dev->bus check
  driver core: skip removal test for non-removable drivers

8 years agoMerge tag 'staging-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sun, 13 Nov 2016 18:13:33 +0000 (10:13 -0800)]
Merge tag 'staging-4.9-rc5' of git://git./linux/kernel/git/gregkh/staging

Pull staging/IIO fixes from Grek KH:
 "Here are a few small staging and iio driver fixes for reported issues.

  The last one was cherry-picked from my -next branch to resolve a build
  warning that Arnd fixed, in his quest to be able to turn
  -Wmaybe-uninitialized back on again. That patch, and all of the
  others, have been in linux-next for a while with no reported issues"

* tag 'staging-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  iio: maxim_thermocouple: detect invalid storage size in read()
  staging: nvec: remove managed resource from PS2 driver
  Revert "staging: nvec: ps2: change serio type to passthrough"
  drivers: staging: nvec: remove bogus reset command for PS/2 interface
  staging: greybus: arche-platform: fix device reference leak
  staging: comedi: ni_tio: fix buggy ni_tio_clock_period_ps() return value
  staging: sm750fb: Fix bugs introduced by early commits
  iio: hid-sensors: Increase the precision of scale to fix wrong reading interpretation.
  iio: orientation: hid-sensor-rotation: Add PM function (fix non working driver)
  iio: st_sensors: fix scale configuration for h3lis331dl
  staging: iio: ad5933: avoid uninitialized variable in error case

8 years agoMerge tag 'usb-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Sun, 13 Nov 2016 18:10:46 +0000 (10:10 -0800)]
Merge tag 'usb-4.9-rc5' of git://git./linux/kernel/git/gregkh/usb

Pull USB / PHY fixes from Greg KH:
 "Here are a number of small USB and PHY driver fixes for 4.9-rc5

  Nothing major, just small fixes for reported issues, all of these have
  been in linux-next for a while with no reported issues"

* tag 'usb-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  USB: cdc-acm: fix TIOCMIWAIT
  cdc-acm: fix uninitialized variable
  drivers/usb: Skip auto handoff for TI and RENESAS usb controllers
  usb: musb: remove duplicated actions
  usb: musb: da8xx: Don't print phy error on -EPROBE_DEFER
  phy: sun4i: check PMU presence when poking unknown bit of pmu
  phy-rockchip-pcie: remove deassert of phy_rst from exit callback
  phy: da8xx-usb: rename the ohci device to ohci-da8xx
  phy: Add reset callback for not generic phy
  uwb: fix device reference leaks
  usb: gadget: u_ether: remove interrupt throttling
  usb: dwc3: st: add missing <linux/pinctrl/consumer.h> include
  usb: dwc3: Fix error handling for core init

8 years agoMerge branch 'for-linus' of git://git.kernel.dk/linux-block
Linus Torvalds [Sun, 13 Nov 2016 18:09:04 +0000 (10:09 -0800)]
Merge branch 'for-linus' of git://git.kernel.dk/linux-block

Pull more block fixes from Jens Axboe:
 "Since I mistakenly left out the lightnvm regression fix yesterday and
  the aoeblk seems adequately tested at this point, might as well send
  out another pull to make -rc5"

* 'for-linus' of git://git.kernel.dk/linux-block:
  aoe: fix crash in page count manipulation
  lightnvm: invalid offset calculation for lba_shift

8 years agoMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Sun, 13 Nov 2016 18:07:08 +0000 (10:07 -0800)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "The megaraid_sas patch in here fixes a major regression in the last
  fix set that made all megaraid_sas cards unusable. It turns out no-one
  had actually tested such an "obvious" fix, sigh. The fix for the fix
  has been tested ...

  The next most serious is the vmw_pvscsi abort problem which basically
  means that aborts don't work on the vmware paravirt devices and error
  handling always escalates to reset.

  The rest are an assortment of missed reference counting in certain
  paths and corner case bugs that show up on some architectures"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: megaraid_sas: fix macro MEGASAS_IS_LOGICAL to avoid regression
  scsi: qla2xxx: fix invalid DMA access after command aborts in PCI device remove
  scsi: qla2xxx: do not queue commands when unloading
  scsi: libcxgbi: fix incorrect DDP resource cleanup
  scsi: qla2xxx: Fix scsi scan hang triggered if adapter fails during init
  scsi: scsi_dh_alua: Fix a reference counting bug
  scsi: vmw_pvscsi: return SUCCESS for successful command aborts
  scsi: mpt3sas: Fix for block device of raid exists even after deleting raid disk
  scsi: scsi_dh_alua: fix missing kref_put() in alua_rtpg_work()

8 years agoMerge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 13 Nov 2016 18:04:55 +0000 (10:04 -0800)]
Merge tag 'clk-fixes-for-linus' of git://git./linux/kernel/git/clk/linux

Pull clk fixes from Stephen Boyd:
 "The typical collection of minor bug fixes in clk drivers. We don't
  have anything in the core framework here, just driver fixes.

  There's a boot fix for Samsung devices and a safety measure for qoriq
  to prevent CPUs from running too fast. There's also a fix for i.MX6Q
  to properly handle audio clock rates. We also have some "that's
  obviously wrong" fixes like bad NULL pointer checks in the MPP driver
  and a poor usage of __pa in the xgene clk driver that are fixed here"

* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
  clk: mmp: pxa910: fix return value check in pxa910_clk_init()
  clk: mmp: pxa168: fix return value check in pxa168_clk_init()
  clk: mmp: mmp2: fix return value check in mmp2_clk_init()
  clk: qoriq: Don't allow CPU clocks higher than starting value
  clk: imx: fix integer overflow in AV PLL round rate
  clk: xgene: Don't call __pa on ioremaped address
  clk/samsung: Use CLK_OF_DECLARE_DRIVER initialization method for CLKOUT
  clk: rockchip: don't return NULL when failing to register ddrclk branch

8 years agogp8psk: Fix DVB frontend attach
Mauro Carvalho Chehab [Sat, 12 Nov 2016 14:46:28 +0000 (12:46 -0200)]
gp8psk: Fix DVB frontend attach

The DVB binding schema at the DVB core assumes that the frontend is a
separate driver.  Faling to do that causes OOPS when the module is
removed, as it tries to do a symbol_put_addr on an internal symbol,
causing craches like:

    WARNING: CPU: 1 PID: 28102 at kernel/module.c:1108 module_put+0x57/0x70
    Modules linked in: dvb_usb_gp8psk(-) dvb_usb dvb_core nvidia_drm(PO) nvidia_modeset(PO) snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_timer snd soundcore nvidia(PO) [last unloaded: rc_core]
    CPU: 1 PID: 28102 Comm: rmmod Tainted: P        WC O 4.8.4-build.1 #1
    Hardware name: MSI MS-7309/MS-7309, BIOS V1.12 02/23/2009
    Call Trace:
       dump_stack+0x44/0x64
       __warn+0xfa/0x120
       module_put+0x57/0x70
       module_put+0x57/0x70
       warn_slowpath_null+0x23/0x30
       module_put+0x57/0x70
       gp8psk_fe_set_frontend+0x460/0x460 [dvb_usb_gp8psk]
       symbol_put_addr+0x27/0x50
       dvb_usb_adapter_frontend_exit+0x3a/0x70 [dvb_usb]

From Derek's tests:
    "Attach bug is fixed, tuning works, module unloads without
     crashing. Everything seems ok!"

Reported-by: Derek <user.vdr@gmail.com>
Tested-by: Derek <user.vdr@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agogp8psk: fix gp8psk_usb_in_op() logic
Mauro Carvalho Chehab [Sat, 12 Nov 2016 14:46:27 +0000 (12:46 -0200)]
gp8psk: fix gp8psk_usb_in_op() logic

Commit bc29131ecb10 ("[media] gp8psk: don't do DMA on stack") fixed the
usage of DMA on stack, but the memcpy was wrong for gp8psk_usb_in_op().
Fix it.

From Derek's email:
    "Fix confirmed using 2 different Skywalker models with
     HD mpeg4, SD mpeg2."

Suggested-by: Johannes Stezenbach <js@linuxtv.org>
Fixes: bc29131ecb10 ("[media] gp8psk: don't do DMA on stack")
Tested-by: Derek <user.vdr@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agodvb-usb: move data_mutex to struct dvb_usb_device
Mauro Carvalho Chehab [Sat, 12 Nov 2016 14:46:26 +0000 (12:46 -0200)]
dvb-usb: move data_mutex to struct dvb_usb_device

The data_mutex is initialized too late, as it is needed for
each device driver's power control, causing an OOPS:

    dvb-usb: found a 'TerraTec/qanu USB2.0 Highspeed DVB-T Receiver' in warm state.
    BUG: unable to handle kernel NULL pointer dereference at           (null)
    IP: [<ffffffff846617af>] __mutex_lock_slowpath+0x6f/0x100 PGD 0
    Oops: 0002 [#1] SMP
    Modules linked in: dvb_usb_cinergyT2(+) dvb_usb
    CPU: 0 PID: 2029 Comm: modprobe Not tainted 4.9.0-rc4-dvbmod #24
    Hardware name: FUJITSU LIFEBOOK A544/FJNBB35 , BIOS Version 1.17 05/09/2014
    task: ffff88020e943840 task.stack: ffff8801f36ec000
    RIP: 0010:[<ffffffff846617af>]  [<ffffffff846617af>] __mutex_lock_slowpath+0x6f/0x100
    RSP: 0018:ffff8801f36efb10  EFLAGS: 00010282
    RAX: 0000000000000000 RBX: ffff88021509bdc8 RCX: 00000000c0000100
    RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88021509bdcc
    RBP: ffff8801f36efb58 R08: ffff88021f216320 R09: 0000000000100000
    R10: ffff88021f216320 R11: 00000023fee6c5a1 R12: ffff88020e943840
    R13: ffff88021509bdcc R14: 00000000ffffffff R15: ffff88021509bdd0
    FS:  00007f21adb86740(0000) GS:ffff88021f200000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000000 CR3: 0000000215bce000 CR4: 00000000001406f0
    Call Trace:
       mutex_lock+0x16/0x25
       cinergyt2_power_ctrl+0x1f/0x60 [dvb_usb_cinergyT2]
       dvb_usb_device_init+0x21e/0x5d0 [dvb_usb]
       cinergyt2_usb_probe+0x21/0x50 [dvb_usb_cinergyT2]
       usb_probe_interface+0xf3/0x2a0
       driver_probe_device+0x208/0x2b0
       __driver_attach+0x87/0x90
       driver_probe_device+0x2b0/0x2b0
       bus_for_each_dev+0x52/0x80
       bus_add_driver+0x1a3/0x220
       driver_register+0x56/0xd0
       usb_register_driver+0x77/0x130
       do_one_initcall+0x46/0x180
       free_vmap_area_noflush+0x38/0x70
       kmem_cache_alloc+0x84/0xc0
       do_init_module+0x50/0x1be
       load_module+0x1d8b/0x2100
       find_symbol_in_section+0xa0/0xa0
       SyS_finit_module+0x89/0x90
       entry_SYSCALL_64_fastpath+0x13/0x94
    Code: e8 a7 1d 00 00 8b 03 83 f8 01 0f 84 97 00 00 00 48 8b 43 10 4c 8d 7b 08 48 89 63 10 4c 89 3c 24 41 be ff ff ff ff 48 89 44 24 08 <48> 89 20 4c 89 64 24 10 eb 1a 49 c7 44 24 08 02 00 00 00 c6 43 RIP  [<ffffffff846617af>] __mutex_lock_slowpath+0x6f/0x100 RSP <ffff8801f36efb10>
    CR2: 0000000000000000

So, move it to the struct dvb_usb_device and initialize it
before calling the driver's callbacks.

Reported-by: Jörg Otte <jrg.otte@gmail.com>
Tested-by: Jörg Otte <jrg.otte@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoMerge branch 'mlxsw-fixes'
David S. Miller [Sun, 13 Nov 2016 17:51:01 +0000 (12:51 -0500)]
Merge branch 'mlxsw-fixes'

Jiri Pirko says:

====================
mlxsw: Couple of fixes

Please, queue-up both for stable. Thanks!
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agomlxsw: spectrum_router: Correctly dump neighbour activity
Arkadi Sharshevsky [Fri, 11 Nov 2016 15:34:26 +0000 (16:34 +0100)]
mlxsw: spectrum_router: Correctly dump neighbour activity

The device's neighbour table is periodically dumped in order to update
the kernel about active neighbours. A single dump session may span
multiple queries, until the response carries less records than requested
or when a record (can contain up to four neighbour entries) is not full.
Current code stops the session when the number of returned records is
zero, which can result in infinite loop in case of high packet rate.

Fix this by stopping the session according to the above logic.

Fixes: c723c735fa6b ("mlxsw: spectrum_router: Periodically update the kernel's neigh table")
Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agomlxsw: spectrum: Fix refcount bug on span entries
Yotam Gigi [Fri, 11 Nov 2016 15:34:25 +0000 (16:34 +0100)]
mlxsw: spectrum: Fix refcount bug on span entries

When binding port to a newly created span entry, its refcount is
initialized to zero even though it has a bound port. That leads
to unexpected behaviour when the user tries to delete that port
from the span entry.

Fix this by initializing the reference count to 1.

Also add a warning to put function.

Fixes: 763b4b70afcd ("mlxsw: spectrum: Add support in matchall mirror TC offloading")
Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge branch 'bnxt_en-fixes'
David S. Miller [Sun, 13 Nov 2016 17:37:32 +0000 (12:37 -0500)]
Merge branch 'bnxt_en-fixes'

Michael Chan says:

====================
bnxt_en: 2 bug fixes.

Bug fixes in bnxt_setup_tc() and VF vitual link state.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agobnxt_en: Fix VF virtual link state.
Michael Chan [Fri, 11 Nov 2016 05:11:43 +0000 (00:11 -0500)]
bnxt_en: Fix VF virtual link state.

If the physical link is down and the VF virtual link is set to "enable",
the current code does not always work.  If the link is down but the
cable is attached, the firmware returns LINK_SIGNAL instead of
NO_LINK.  The current code is treating LINK_SIGNAL as link up.
The fix is to treat link as down when the link_status != LINK.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agobnxt_en: Fix ring arithmetic in bnxt_setup_tc().
Michael Chan [Fri, 11 Nov 2016 05:11:42 +0000 (00:11 -0500)]
bnxt_en: Fix ring arithmetic in bnxt_setup_tc().

The logic is missing the check on whether the tx and rx rings are sharing
completion rings or not.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoRevert "include/uapi/linux/atm_zatm.h: include linux/time.h"
Mike Frysinger [Fri, 11 Nov 2016 00:08:39 +0000 (19:08 -0500)]
Revert "include/uapi/linux/atm_zatm.h: include linux/time.h"

This reverts commit cf00713a655d ("include/uapi/linux/atm_zatm.h: include
linux/time.h").

This attempted to fix userspace breakage that no longer existed when
the patch was merged.  Almost one year earlier, commit 70ba07b675b5
("atm: remove 'struct zatm_t_hist'") deleted the struct in question.

After this patch was merged, we now have to deal with people being
unable to include this header in conjunction with standard C library
headers like stdlib.h (which linux-atm does).  Example breakage:
x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I../.. -I./../q2931 -I./../saal \
-I.  -DCPPFLAGS_TEST  -I../../src/include -O2 -march=native -pipe -g \
-frecord-gcc-switches -freport-bug -Wimplicit-function-declaration \
-Wnonnull -Wstrict-aliasing -Wparentheses -Warray-bounds \
-Wfree-nonheap-object -Wreturn-local-addr -fno-strict-aliasing -Wall \
-Wshadow -Wpointer-arith -Wwrite-strings -Wstrict-prototypes -c zntune.c
In file included from /usr/include/linux/atm_zatm.h:17:0,
                 from zntune.c:17:
/usr/include/linux/time.h:9:8: error: redefinition of ‘struct timespec’
 struct timespec {
        ^
In file included from /usr/include/sys/select.h:43:0,
                 from /usr/include/sys/types.h:219,
                 from /usr/include/stdlib.h:314,
                 from zntune.c:9:
/usr/include/time.h:120:8: note: originally defined here
 struct timespec
        ^

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Mikko Rapeli <mikko.rapeli@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agotcp: take care of truncations done by sk_filter()
Eric Dumazet [Thu, 10 Nov 2016 21:12:35 +0000 (13:12 -0800)]
tcp: take care of truncations done by sk_filter()

With syzkaller help, Marco Grassi found a bug in TCP stack,
crashing in tcp_collapse()

Root cause is that sk_filter() can truncate the incoming skb,
but TCP stack was not really expecting this to happen.
It probably was expecting a simple DROP or ACCEPT behavior.

We first need to make sure no part of TCP header could be removed.
Then we need to adjust TCP_SKB_CB(skb)->end_seq

Many thanks to syzkaller team and Marco for giving us a reproducer.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Marco Grassi <marco.gra@gmail.com>
Reported-by: Vladis Dronov <vdronov@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoipv4: use new_gw for redirect neigh lookup
Stephen Suryaputra Lin [Thu, 10 Nov 2016 16:16:15 +0000 (11:16 -0500)]
ipv4: use new_gw for redirect neigh lookup

In v2.6, ip_rt_redirect() calls arp_bind_neighbour() which returns 0
and then the state of the neigh for the new_gw is checked. If the state
isn't valid then the redirected route is deleted. This behavior is
maintained up to v3.5.7 by check_peer_redirect() because rt->rt_gateway
is assigned to peer->redirect_learned.a4 before calling
ipv4_neigh_lookup().

After commit 5943634fc559 ("ipv4: Maintain redirect and PMTU info in
struct rtable again."), ipv4_neigh_lookup() is performed without the
rt_gateway assigned to the new_gw. In the case when rt_gateway (old_gw)
isn't zero, the function uses it as the key. The neigh is most likely
valid since the old_gw is the one that sends the ICMP redirect message.
Then the new_gw is assigned to fib_nh_exception. The problem is: the
new_gw ARP may never gets resolved and the traffic is blackholed.

So, use the new_gw for neigh lookup.

Changes from v1:
 - use __ipv4_neigh_lookup instead (per Eric Dumazet).

Fixes: 5943634fc559 ("ipv4: Maintain redirect and PMTU info in struct rtable again.")
Signed-off-by: Stephen Suryaputra Lin <ssurya@ieee.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agor8152: Fix error path in open function
Guenter Roeck [Thu, 10 Nov 2016 03:51:25 +0000 (19:51 -0800)]
r8152: Fix error path in open function

If usb_submit_urb() called from the open function fails, the following
crash may be observed.

r8152 8-1:1.0 eth0: intr_urb submit failed: -19
...
r8152 8-1:1.0 eth0: v1.08.3
Unable to handle kernel paging request at virtual address 6b6b6b6b6b6b6b7b
pgd = ffffffc0e7305000
[6b6b6b6b6b6b6b7b] *pgd=0000000000000000, *pud=0000000000000000
Internal error: Oops: 96000004 [#1] PREEMPT SMP
...
PC is at notifier_chain_register+0x2c/0x58
LR is at blocking_notifier_chain_register+0x54/0x70
...
Call trace:
[<ffffffc0002407f8>] notifier_chain_register+0x2c/0x58
[<ffffffc000240bdc>] blocking_notifier_chain_register+0x54/0x70
[<ffffffc00026991c>] register_pm_notifier+0x24/0x2c
[<ffffffbffc183200>] rtl8152_open+0x3dc/0x3f8 [r8152]
[<ffffffc000808000>] __dev_open+0xac/0x104
[<ffffffc0008082f8>] __dev_change_flags+0xb0/0x148
[<ffffffc0008083c4>] dev_change_flags+0x34/0x70
[<ffffffc000818344>] do_setlink+0x2c8/0x888
[<ffffffc0008199d4>] rtnl_newlink+0x328/0x644
[<ffffffc000819e98>] rtnetlink_rcv_msg+0x1a8/0x1d4
[<ffffffc0008373c8>] netlink_rcv_skb+0x68/0xd0
[<ffffffc000817990>] rtnetlink_rcv+0x2c/0x3c
[<ffffffc000836d1c>] netlink_unicast+0x16c/0x234
[<ffffffc00083720c>] netlink_sendmsg+0x340/0x364
[<ffffffc0007e85d0>] sock_sendmsg+0x48/0x60
[<ffffffc0007e9c30>] SyS_sendto+0xe0/0x120
[<ffffffc0007e9cb0>] SyS_send+0x40/0x4c
[<ffffffc000203e34>] el0_svc_naked+0x24/0x28

Clean up error handling to avoid registering the notifier if the open
function is going to fail.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoiio: maxim_thermocouple: detect invalid storage size in read()
Arnd Bergmann [Tue, 25 Oct 2016 15:55:04 +0000 (17:55 +0200)]
iio: maxim_thermocouple: detect invalid storage size in read()

As found by gcc -Wmaybe-uninitialized, having a storage_bytes value other
than 2 or 4 will result in undefined behavior:

drivers/iio/temperature/maxim_thermocouple.c: In function 'maxim_thermocouple_read':
drivers/iio/temperature/maxim_thermocouple.c:141:5: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This probably cannot happen, but returning -EINVAL here is appropriate
and makes gcc happy and the code more robust.

Fixes: 231147ee77f3 ("iio: maxim_thermocouple: Align 16 bit big endian value of raw reads")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
(cherry picked from commit 32cb7d27e65df9daa7cee8f1fdf7b259f214bee2)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agox86/efi: Prevent mixed mode boot corruption with CONFIG_VMAP_STACK=y
Matt Fleming [Sat, 12 Nov 2016 21:04:24 +0000 (21:04 +0000)]
x86/efi: Prevent mixed mode boot corruption with CONFIG_VMAP_STACK=y

Booting an EFI mixed mode kernel has been crashing since commit:

  e37e43a497d5 ("x86/mm/64: Enable vmapped stacks (CONFIG_HAVE_ARCH_VMAP_STACK=y)")

The user-visible effect in my test setup was the kernel being unable
to find the root file system ramdisk. This was likely caused by silent
memory or page table corruption.

Enabling CONFIG_DEBUG_VIRTUAL=y immediately flagged the thunking code as
abusing virt_to_phys() because it was passing addresses that were not
part of the kernel direct mapping.

Use the slow version instead, which correctly handles all memory
regions by performing a page table walk.

Suggested-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20161112210424.5157-3-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
8 years agox86/efi: Fix EFI memmap pointer size warning
Borislav Petkov [Sat, 12 Nov 2016 21:04:23 +0000 (21:04 +0000)]
x86/efi: Fix EFI memmap pointer size warning

Fix this when building on 32-bit:

  arch/x86/platform/efi/efi.c: In function ‘__efi_enter_virtual_mode’:
  arch/x86/platform/efi/efi.c:911:5: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
       (efi_memory_desc_t *)pa);
       ^
  arch/x86/platform/efi/efi.c:918:5: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
       (efi_memory_desc_t *)pa);
       ^

The @pa local variable is declared as phys_addr_t and that is a u64 when
CONFIG_PHYS_ADDR_T_64BIT=y. (The last is enabled on 32-bit on a PAE
build.)

However, its value comes from __pa() which is basically doing pointer
arithmetic and checking, and returns unsigned long as it is the native
pointer width.

So let's use an unsigned long too. It should be fine to do so because
the later users cast it to a pointer too.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20161112210424.5157-2-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
8 years agonet: bpqether.h: remove if_ether.h guard
Baruch Siach [Thu, 10 Nov 2016 11:21:42 +0000 (13:21 +0200)]
net: bpqether.h: remove if_ether.h guard

__LINUX_IF_ETHER_H is not defined anywhere, and if_ether.h can keep itself from
double inclusion, though it uses a single underscore prefix.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: __skb_flow_dissect() must cap its return value
Eric Dumazet [Thu, 10 Nov 2016 00:04:46 +0000 (16:04 -0800)]
net: __skb_flow_dissect() must cap its return value

After Tom patch, thoff field could point past the end of the buffer,
this could fool some callers.

If an skb was provided, skb->len should be the upper limit.
If not, hlen is supposed to be the upper limit.

Fixes: a6e544b0a88b ("flow_dissector: Jump to exit code in __skb_flow_dissect")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Yibin Yang <yibyang@cisco.com
Acked-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge branch 'fix-bpf_redirect'
David S. Miller [Sun, 13 Nov 2016 04:38:08 +0000 (23:38 -0500)]
Merge branch 'fix-bpf_redirect'

Martin KaFai Lau says:

====================
bpf: Fix bpf_redirect to an ipip/ip6tnl dev

This patch set fixes a bug in bpf_redirect(dev, flags) when dev is an
ipip/ip6tnl.  The current problem is IP-EthHdr-IP is sent out instead of
IP-IP.

Patch 1 adds a dev->type test similar to dev_is_mac_header_xmit()
in act_mirred.c which is only available in net-next.  We can consider to
refactor it once this patch is pulled into net-next from net.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agobpf: Add test for bpf_redirect to ipip/ip6tnl
Martin KaFai Lau [Wed, 9 Nov 2016 23:36:34 +0000 (15:36 -0800)]
bpf: Add test for bpf_redirect to ipip/ip6tnl

The test creates two netns, ns1 and ns2.  The host (the default netns)
has an ipip or ip6tnl dev configured for tunneling traffic to the ns2.

    ping VIPS from ns1 <----> host <--tunnel--> ns2 (VIPs at loopback)

The test is to have ns1 pinging VIPs configured at the loopback
interface in ns2.

The VIPs are 10.10.1.102 and 2401:face::66 (which are configured
at lo@ns2). [Note: 0x66 => 102].

At ns1, the VIPs are routed _via_ the host.

At the host, bpf programs are installed at the veth to redirect packets
from a veth to the ipip/ip6tnl.  The test is configured in a way so
that both ingress and egress can be tested.

At ns2, the ipip/ip6tnl dev is configured with the local and remote address
specified.  The return path is routed to the dev ipip/ip6tnl.

During egress test, the host also locally tests pinging the VIPs to ensure
that bpf_redirect at egress also works for the direct egress (i.e. not
forwarding from dev ve1 to ve2).

Acked-by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agobpf: Fix bpf_redirect to an ipip/ip6tnl dev
Martin KaFai Lau [Wed, 9 Nov 2016 23:36:33 +0000 (15:36 -0800)]
bpf: Fix bpf_redirect to an ipip/ip6tnl dev

If the bpf program calls bpf_redirect(dev, 0) and dev is
an ipip/ip6tnl, it currently includes the mac header.
e.g. If dev is ipip, the end result is IP-EthHdr-IP instead
of IP-IP.

The fix is to pull the mac header.  At ingress, skb_postpull_rcsum()
is not needed because the ethhdr should have been pulled once already
and then got pushed back just before calling the bpf_prog.
At egress, this patch calls skb_postpull_rcsum().

If bpf_redirect(dev, BPF_F_INGRESS) is called,
it also fails now because it calls dev_forward_skb() which
eventually calls eth_type_trans(skb, dev).  The eth_type_trans()
will set skb->type = PACKET_OTHERHOST because the mac address
does not match the redirecting dev->dev_addr.  The PACKET_OTHERHOST
will eventually cause the ip_rcv() errors out.  To fix this,
____dev_forward_skb() is added.

Joint work with Daniel Borkmann.

Fixes: cfc7381b3002 ("ip_tunnel: add collect_md mode to IPIP tunnel")
Fixes: 8d79266bc48c ("ip6_tunnel: add collect_md mode to IPv6 tunnels")
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoaoe: fix crash in page count manipulation
Jens Axboe [Sat, 12 Nov 2016 01:28:50 +0000 (18:28 -0700)]
aoe: fix crash in page count manipulation

aoeblk contains some mysterious code, that wants to elevate the bio
vec page counts while it's under IO. That is not needed, it's
fragile, and it's causing kernel oopses for some.

Reported-by: Tested-by: Don Koch <kochd@us.ibm.com>
Tested-by: Tested-by: Don Koch <kochd@us.ibm.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
8 years agoMerge tag 'perf-hists-hierarchy-fixes-for-mingo-20161111' of git://git.kernel.org...
Ingo Molnar [Sat, 12 Nov 2016 10:47:30 +0000 (11:47 +0100)]
Merge tag 'perf-hists-hierarchy-fixes-for-mingo-20161111' of git://git./linux/kernel/git/acme/linux into perf/urgent

Pull perf/urgent fixes for perf {top,report} --hierarchy, from Arnaldo Carvalho de Melo:

 - These are fixes for the --hierarchy view of perf top and report, fixing
   output oddities, mostly related to scrolling. (Namhyung Kim)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
8 years agolightnvm: invalid offset calculation for lba_shift
Matias Bjørling [Thu, 10 Nov 2016 11:26:57 +0000 (12:26 +0100)]
lightnvm: invalid offset calculation for lba_shift

The ns->lba_shift assumes its value to be the logarithmic of the
LA size. A previous patch duplicated the lba_shift calculation into
lightnvm. It prematurely also subtracted a 512byte shift, which commonly
is applied per-command. The 512byte shift being subtracted twice led to
data loss when restoring the logical to physical mapping table from
device and when issuing I/O commands using rrpc.

Fix offset by removing the 512byte shift subtraction when calculating
lba_shift.

Fixes: b0b4e09c1ae7 "lightnvm: control life of nvm_dev in driver"
Reported-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
8 years agoMerge tag 'acpi-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Sat, 12 Nov 2016 01:02:01 +0000 (17:02 -0800)]
Merge tag 'acpi-4.9-rc5' of git://git./linux/kernel/git/rafael/linux-pm

Pull ACPI fix from Rafael Wysocki:
 "Fix a recent regression in the 8250_dw serial driver introduced by
  adding a quirk for the APM X-Gene SoC to it which uncovered an issue
  related to the handling of built-in device properties in the core ACPI
  device enumeration code (Heikki Krogerus)"

* tag 'acpi-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / platform: Add support for build-in properties

8 years agoMerge tag 'pm-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Linus Torvalds [Sat, 12 Nov 2016 00:54:23 +0000 (16:54 -0800)]
Merge tag 'pm-4.9-rc5' of git://git./linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix two bugs in error code paths in the PM core (system-wide
  suspend of devices), a device reference leak in the boot-time suspend
  test code and a cpupower utility regression from the 4.7 cycle.

  Specifics:

   - Prevent the PM core from attempting to suspend parent devices if
     any of their children, whose suspend callbacks were invoked
     asynchronously, have failed to suspend during the "late" and
     "noirq" phases of system-wide suspend of devices (Brian Norris).

   - Prevent the boot-time system suspend test code from leaking a
     reference to the RTC device used by it (Johan Hovold).

   - Fix cpupower to use the return value of one of its library
     functions correctly and restore the correct behavior of it when
     used for setting cpufreq tunables broken during the 4.7 development
     cycle (Laura Abbott)"

* tag 'pm-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM / sleep: don't suspend parent when async child suspend_{noirq, late} fails
  PM / sleep: fix device reference leak in test_suspend
  cpupower: Correct return type of cpu_power_is_cpu_online() in cpufreq-set

8 years agoMerge tag 'arc-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
Linus Torvalds [Sat, 12 Nov 2016 00:51:50 +0000 (16:51 -0800)]
Merge tag 'arc-4.9-rc5' of git://git./linux/kernel/git/vgupta/arc

Pull ARC fixes from Vineet Gupta:

 - mmap handler for dma ops as generic handler no longer works for us
   [Alexey]

 - Fixes for EZChip platform [Noam]

 - Fix RTC clocksource driver build issue

 - ARC IRQ handling fixes [Yuriy]

 - Revert a recent makefile change which doesn't go well with oldish
   tools out in the wild

* tag 'arc-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARCv2: MCIP: Use IDU_M_DISTRI_DEST mode if there is only 1 destination core
  ARC: IRQ: Do not use hwirq as virq and vice versa
  ARC: [plat-eznps] set default baud for early console
  ARC: [plat-eznps] remove IPI clear from SMP operations
  Revert "ARC: build: retire old toggles"
  ARC: timer: rtc: implement read loop in "C" vs. inline asm
  ARC: change return value of userspace cmpxchg assist syscall
  arc: Implement arch-specific dma_map_ops.mmap
  ARC: [SMP] avoid overriding present cpumask
  ARC: Enable PERF_EVENTS in nSIM driven platforms

8 years agoMerge tag 'platform-drivers-x86-v4.9-3' of git://git.infradead.org/users/dvhart/linux...
Linus Torvalds [Sat, 12 Nov 2016 00:48:49 +0000 (16:48 -0800)]
Merge tag 'platform-drivers-x86-v4.9-3' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86

Pull x86 platform driver fixes from Darren Hart:
 "Minor doc fix, a DMI match for ideapad and a fix to toshiba-wmi to
  avoid loading on non-toshiba systems.

  Documentation/ABI:
   - ibm_rtl: The "What:" fields are incomplete

  toshiba-wmi:
   - Fix loading the driver on non Toshiba laptops

  ideapad-laptop:
   - Add another DMI entry for Yoga 900"

* tag 'platform-drivers-x86-v4.9-3' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86:
  Documentation/ABI: ibm_rtl: The "What:" fields are incomplete
  toshiba-wmi: Fix loading the driver on non Toshiba laptops
  ideapad-laptop: Add another DMI entry for Yoga 900

8 years agoMerge branch 'for-linus' of git://git.kernel.dk/linux-block
Linus Torvalds [Sat, 12 Nov 2016 00:42:03 +0000 (16:42 -0800)]
Merge branch 'for-linus' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Two small (really, one liners both of them!) fixes that should go into
  this series:

   - Request allocation error handling fix for nbd, from Christophe,
     fixing a regression in this series.

   - An oops fix for drbd. Not a regression in this series, but stable
     material. From Richard"

* 'for-linus' of git://git.kernel.dk/linux-block:
  drbd: Fix kernel_sendmsg() usage - potential NULL deref
  nbd: Fix error handling

8 years agoMerge tag 'pci-v4.9-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Linus Torvalds [Sat, 12 Nov 2016 00:38:26 +0000 (16:38 -0800)]
Merge tag 'pci-v4.9-fixes-3' of git://git./linux/kernel/git/helgaas/pci

Pull PCI fixes from Bjorn Helgaas:

 - Update MAINTAINERS for Intel VMD driver filename

 - Update Rockchip rk3399 host bridge driver DTS and resets

 - Fix ROM shadow problem that made some video device initialization
   fail

* tag 'pci-v4.9-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: VMD: Update filename to reflect move
  arm64: dts: rockchip: add three new resets for rk3399 PCIe controller
  PCI: rockchip: Add three new resets as required properties
  PCI: Don't attempt to claim shadow copies of ROM

8 years agoMerge tag 'drm-fixes-for-v4.9-rc5' of git://people.freedesktop.org/~airlied/linux
Linus Torvalds [Sat, 12 Nov 2016 00:25:28 +0000 (16:25 -0800)]
Merge tag 'drm-fixes-for-v4.9-rc5' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "AMD, radeon, i915, imx, msm and udl fixes:

   - amdgpu/radeon have a number of power management regressions and
     fixes along with some better error checking

   - imx has a single regression fix

   - udl has a single kmalloc instead of stack for usb control msg fix

   - msm has some fixes for modesetting bugs and regressions

   - i915 has a one fix for a Sandybridge regression along with some
     others for DP audio.

  They all seem pretty okay at this stage, we've got one MST fix I know
  going through process for i915, but I expect it'll be next week"

* tag 'drm-fixes-for-v4.9-rc5' of git://people.freedesktop.org/~airlied/linux: (30 commits)
  drm/udl: make control msg static const. (v2)
  drm/amd/powerplay: implement get_clock_by_type for iceland.
  drm/amd/powerplay/smu7: fix checks in smu7_get_evv_voltages (v2)
  drm/amd/powerplay: update phm_get_voltage_evv_on_sclk for iceland
  drm/amd/powerplay: propagate errors in phm_get_voltage_evv_on_sclk
  drm/imx: disable planes before DC
  drm/amd/powerplay: return false instead of -EINVAL
  drm/amdgpu/powerplay/smu7: fix unintialized data usage
  drm/amdgpu: fix crash in acp_hw_fini
  drm/i915: Limit Valleyview and earlier to only using mappable scanout
  drm/i915: Round tile chunks up for constructing partial VMAs
  drm/i915/dp: Extend BDW DP audio workaround to GEN9 platforms
  drm/i915/dp: BDW cdclk fix for DP audio
  drm/i915/vlv: Prevent enabling hpd polling in late suspend
  drm/i915: Respect alternate_ddc_pin for all DDI ports
  drm/msm: Fix error handling crashes seen when VRAM allocation fails
  drm/msm/mdp5: 8x16 actually has 8 mixer stages
  drm/msm/mdp5: no scaling support on RGBn pipes for 8x16
  drm/msm/mdp5: handle non-fullscreen base plane case
  drm/msm: Set CLK_IGNORE_UNUSED flag for PLL clocks
  ...

8 years agoMerge tag 'mmc-v4.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Linus Torvalds [Sat, 12 Nov 2016 00:23:14 +0000 (16:23 -0800)]
Merge tag 'mmc-v4.9-rc4' of git://git./linux/kernel/git/ulfh/mmc

Pull MMC fixes from Ulf Hansson:
 "MMC core:
   - Fix mmc card initialization for hosts not supporting HW busy
     detection
   - Fix mmc_test for sending commands during non-blocking write

  MMC host:
   - mxs: Avoid using an uninitialized
   - sdhci: Restore enhanced strobe setting during runtime resume
   - sdhci: Fix a couple of reset related issues
   - dw_mmc: Fix a reset controller issue"

* tag 'mmc-v4.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: mxs: Initialize the spinlock prior to using it
  mmc: mmc: Use 500ms as the default generic CMD6 timeout
  mmc: mmc_test: Fix "Commands during non-blocking write" tests
  mmc: sdhci: Fix missing enhanced strobe setting during runtime resume
  mmc: sdhci: Reset cmd and data circuits after tuning failure
  mmc: sdhci: Fix unexpected data interrupt handling
  mmc: sdhci: Fix CMD line reset interfering with ongoing data transfer
  mmc: dw_mmc: add the "reset" as name of reset controller
  Documentation: synopsys-dw-mshc: add binding for reset-names

8 years agoMerge tag 'pinctrl-v4.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
Linus Torvalds [Sat, 12 Nov 2016 00:21:20 +0000 (16:21 -0800)]
Merge tag 'pinctrl-v4.9-3' of git://git./linux/kernel/git/linusw/linux-pinctrl

Pull pin control fixes from Linus Walleij:
 "All is about drivers, no core business going on.

   - Fix a host of runtime problems with the Intel Cherryview driver:
     suspend/resume needs to be marshalled properly, and strange effects
     from BIOS interaction during suspend/resume need to be dealt with.

   - A single bit was being set wrong in the Aspeed driver.

   - Fix an iProc probe ordering fallout resulting from v4.9
     refactorings for bus population.

   - Do not specify a default trigger in the ST Micro cascaded GPIO IRQ
     controller: the kernel will moan.

   - Make IRQs optional altogether on the STM32 driver, it turns out not
     all systems have them or want them.

   - Fix a re-probe bug in the i.MX driver, it will eventually crash if
     probed repeatedly, not good"

* tag 'pinctrl-v4.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
  pinctrl-aspeed-g5: Never set SCU90[6]
  pinctrl: cherryview: Prevent possible interrupt storm on resume
  pinctrl: cherryview: Serialize register access in suspend/resume
  pinctrl: imx: reset group index on probe
  pinctrl: stm32: move gpio irqs binding to optional
  pinctrl: stm32: remove dependency with interrupt controller
  pinctrl: st: don't specify default interrupt trigger
  pinctrl: iproc: Fix iProc and NSP GPIO support

8 years agoMerge branches 'pm-tools-fixes' and 'pm-sleep-fixes'
Rafael J. Wysocki [Fri, 11 Nov 2016 22:24:58 +0000 (23:24 +0100)]
Merge branches 'pm-tools-fixes' and 'pm-sleep-fixes'

* pm-tools-fixes:
  cpupower: Correct return type of cpu_power_is_cpu_online() in cpufreq-set

* pm-sleep-fixes:
  PM / sleep: don't suspend parent when async child suspend_{noirq, late} fails
  PM / sleep: fix device reference leak in test_suspend

8 years agoMerge branch 'device-properties'
Rafael J. Wysocki [Fri, 11 Nov 2016 22:23:02 +0000 (23:23 +0100)]
Merge branch 'device-properties'

* device-properties:
  ACPI / platform: Add support for build-in properties

8 years agoMerge branch 'maybe-uninitialized' (patches from Arnd)
Linus Torvalds [Fri, 11 Nov 2016 18:03:01 +0000 (10:03 -0800)]
Merge branch 'maybe-uninitialized' (patches from Arnd)

Merge fixes for -Wmaybe-uninitialized from Arnd Bergmann:
 "It took a while for some patches to make it into mainline through
  maintainer trees, but the 28-patch series is now reduced to 10, with
  one tiny patch added at the end.

  Aside from patches that are no longer required, I did these changes
  compared to version 1:

   - Dropped "iio: maxim_thermocouple: detect invalid storage size in
     read()", which is currently in linux-next as commit 32cb7d27e65d.
     This is the only remaining warning I see for a couple of corner
     cases (kbuild bot reports it on blackfin, kernelci bot and arm-soc
     bot both report it on arm64)

   - Dropped "brcmfmac: avoid maybe-uninitialized warning in
     brcmf_cfg80211_start_ap", which is currently in net/master merge
     pending.

   - Dropped two x86 patches, "x86: math-emu: possible uninitialized
     variable use" and "x86: mark target address as output in 'insb'
     asm" as they do not seem to trigger for a default build, and I got
     no feedback on them. Both of these are ancient issues and seem
     harmless, I will send them again to the x86 maintainers once the
     rest is merged.

   - Dropped "rbd: false-postive gcc-4.9 -Wmaybe-uninitialized" based on
     feedback from Ilya Dryomov, who already has a different fix queued
     up for v4.10. The kbuild bot reports this as a warning for xtensa.

   - Replaced "crypto: aesni: avoid -Wmaybe-uninitialized warning" with
     a simpler patch, this one always triggers but my first solution
     would not be safe for linux-4.9 any more at this point. I'll follow
     up with the larger patch as a cleanup for 4.10.

   - Replaced "dib0700: fix nec repeat handling" with a better one,
     contributed by Sean Young"

* -Wmaybe-uninitialized fixes:
  Kbuild: enable -Wmaybe-uninitialized warnings by default
  pcmcia: fix return value of soc_pcmcia_regulator_set
  infiniband: shut up a maybe-uninitialized warning
  crypto: aesni: shut up -Wmaybe-uninitialized warning
  rc: print correct variable for z8f0811
  dib0700: fix nec repeat handling
  s390: pci: don't print uninitialized data for debugging
  nios2: fix timer initcall return value
  x86: apm: avoid uninitialized data
  NFSv4.1: work around -Wmaybe-uninitialized warning
  Kbuild: enable -Wmaybe-uninitialized warning for "make W=1"

8 years agoMerge branch 'akpm' (patches from Andrew)
Linus Torvalds [Fri, 11 Nov 2016 17:44:23 +0000 (09:44 -0800)]
Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "15 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  lib/stackdepot: export save/fetch stack for drivers
  mm: kmemleak: scan .data.ro_after_init
  memcg: prevent memcg caches to be both OFF_SLAB & OBJFREELIST_SLAB
  coredump: fix unfreezable coredumping task
  mm/filemap: don't allow partially uptodate page for pipes
  mm/hugetlb: fix huge page reservation leak in private mapping error paths
  ocfs2: fix not enough credit panic
  Revert "console: don't prefer first registered if DT specifies stdout-path"
  mm: hwpoison: fix thp split handling in memory_failure()
  swapfile: fix memory corruption via malformed swapfile
  mm/cma.c: check the max limit for cma allocation
  scripts/bloat-o-meter: fix SIGPIPE
  shmem: fix pageflags after swapping DMA32 object
  mm, frontswap: make sure allocated frontswap map is assigned
  mm: remove extra newline from allocation stall warning

8 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Linus Torvalds [Fri, 11 Nov 2016 17:19:01 +0000 (09:19 -0800)]
Merge branch 'for-linus' of git://git./linux/kernel/git/viro/vfs

Pull VFS fixes from Al Viro:
 "Christoph's and Jan's aio fixes, fixup for generic_file_splice_read
  (removal of pointless detritus that actually breaks it when used for
  gfs2 ->splice_read()) and fixup for generic_file_read_iter()
  interaction with ITER_PIPE destinations."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  splice: remove detritus from generic_file_splice_read()
  mm/filemap: don't allow partially uptodate page for pipes
  aio: fix freeze protection of aio writes
  fs: remove aio_run_iocb
  fs: remove the never implemented aio_fsync file operation
  aio: hold an extra file reference over AIO read/write operations

8 years agoMerge tag 'ceph-for-4.9-rc5' of git://github.com/ceph/ceph-client
Linus Torvalds [Fri, 11 Nov 2016 17:17:10 +0000 (09:17 -0800)]
Merge tag 'ceph-for-4.9-rc5' of git://github.com/ceph/ceph-client

Pull Ceph fixes from Ilya Dryomov:
 "Ceph's ->read_iter() implementation is incompatible with the new
  generic_file_splice_read() code that went into -rc1.  Switch to the
  less efficient default_file_splice_read() for now; the proper fix is
  being held for 4.10.

  We also have a fix for a 4.8 regression and a trival libceph fixup"

* tag 'ceph-for-4.9-rc5' of git://github.com/ceph/ceph-client:
  libceph: initialize last_linger_id with a large integer
  libceph: fix legacy layout decode with pool 0
  ceph: use default file splice read callback

8 years agoMerge tag 'nfs-for-4.9-3' of git://git.linux-nfs.org/projects/anna/linux-nfs
Linus Torvalds [Fri, 11 Nov 2016 17:15:30 +0000 (09:15 -0800)]
Merge tag 'nfs-for-4.9-3' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client bugfixes from Anna Schumaker:
 "Most of these fix regressions in 4.9, and none are going to stable
  this time around.

  Bugfixes:
   - Trim extra slashes in v4 nfs_paths to fix tools that use this
   - Fix a -Wmaybe-uninitialized warnings
   - Fix suspicious RCU usages
   - Fix Oops when mounting multiple servers at once
   - Suppress a false-positive pNFS error
   - Fix a DMAR failure in NFS over RDMA"

* tag 'nfs-for-4.9-3' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  xprtrdma: Fix DMAR failure in frwr_op_map() after reconnect
  fs/nfs: Fix used uninitialized warn in nfs4_slot_seqid_in_use()
  NFS: Don't print a pNFS error if we aren't using pNFS
  NFS: Ignore connections that have cl_rpcclient uninitialized
  SUNRPC: Fix suspicious RCU usage
  NFSv4.1: work around -Wmaybe-uninitialized warning
  NFS: Trim extra slash in v4 nfs_path

8 years agoMerge tag 'xfs-fixes-for-linus-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 11 Nov 2016 17:13:48 +0000 (09:13 -0800)]
Merge tag 'xfs-fixes-for-linus-4.9-rc5' of git://git./linux/kernel/git/dgc/linux-xfs

Pull xfs fix from Dave Chinner:
 "This is a fix for an unmount hang (regression) when the filesystem is
  shutdown.  It was supposed to go to you for -rc3, but I accidentally
  tagged the commit prior to it in that pullreq.

  Summary:

   - fix for aborting deferred transactions on filesystem shutdown"

* tag 'xfs-fixes-for-linus-4.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs:
  xfs: defer should abort intent items if the trans roll fails

8 years agoKbuild: enable -Wmaybe-uninitialized warnings by default
Arnd Bergmann [Thu, 10 Nov 2016 16:44:54 +0000 (17:44 +0100)]
Kbuild: enable -Wmaybe-uninitialized warnings by default

Previously the warnings were added back at the W=1 level and above, this
now turns them on again by default, assuming that we have addressed all
warnings and again have a clean build for v4.10.

I found a number of new warnings in linux-next already and submitted
bugfixes for those.  Hopefully they are caught by the 0day builder in
the future as soon as this patch is merged.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agopcmcia: fix return value of soc_pcmcia_regulator_set
Arnd Bergmann [Thu, 10 Nov 2016 16:44:53 +0000 (17:44 +0100)]
pcmcia: fix return value of soc_pcmcia_regulator_set

The newly introduced soc_pcmcia_regulator_set() function sometimes
returns without setting its return code, as shown by this warning:

  drivers/pcmcia/soc_common.c: In function 'soc_pcmcia_regulator_set':
  drivers/pcmcia/soc_common.c:112:5: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This changes it to propagate the regulator_disable() result instead.

Fixes: ac61b6001a63 ("pcmcia: soc_common: add support for Vcc and Vpp regulators")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoinfiniband: shut up a maybe-uninitialized warning
Arnd Bergmann [Thu, 10 Nov 2016 16:44:52 +0000 (17:44 +0100)]
infiniband: shut up a maybe-uninitialized warning

Some configurations produce this harmless warning when built with gcc
-Wmaybe-uninitialized:

  infiniband/core/cma.c: In function 'cma_get_net_dev':
  infiniband/core/cma.c:1242:12: warning: 'src_addr_storage.sin_addr.s_addr' may be used uninitialized in this function [-Wmaybe-uninitialized]

I previously reported this for the powerpc64 defconfig, but have now
reproduced the same thing for x86 as well, using gcc-5 or higher.

The code looks correct to me, and this change just rearranges it by
making sure we alway initialize the entire address structure to make the
warning disappear.  My first approach added an initialization at the
time of the declaration, which Doug commented may be too costly, so I
hope this version doesn't add overhead.

Link: http://arm-soc.lixom.net/buildlogs/mainline/v4.7-rc6/buildall.powerpc.ppc64_defconfig.log.passed
Link: https://patchwork.kernel.org/patch/9212825/
Acked-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agocrypto: aesni: shut up -Wmaybe-uninitialized warning
Arnd Bergmann [Thu, 10 Nov 2016 16:44:51 +0000 (17:44 +0100)]
crypto: aesni: shut up -Wmaybe-uninitialized warning

The rfc4106 encrypy/decrypt helper functions cause an annoying
false-positive warning in allmodconfig if we turn on
-Wmaybe-uninitialized warnings again:

  arch/x86/crypto/aesni-intel_glue.c: In function ‘helper_rfc4106_decrypt’:
  include/linux/scatterlist.h:67:31: warning: ‘dst_sg_walk.sg’ may be used uninitialized in this function [-Wmaybe-uninitialized]

The problem seems to be that the compiler doesn't track the state of the
'one_entry_in_sg' variable across the kernel_fpu_begin/kernel_fpu_end
section.

This takes the easy way out by adding a bogus initialization, which
should be harmless enough to get the patch into v4.9 so we can turn on
this warning again by default without producing useless output.  A
follow-up patch for v4.10 rearranges the code to make the warning go
away.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agorc: print correct variable for z8f0811
Arnd Bergmann [Thu, 10 Nov 2016 16:44:50 +0000 (17:44 +0100)]
rc: print correct variable for z8f0811

A recent rework accidentally left a debugging printk untouched while
changing the meaning of the variables, leading to an uninitialized
variable being printed:

  drivers/media/i2c/ir-kbd-i2c.c: In function 'get_key_haup_common':
  drivers/media/i2c/ir-kbd-i2c.c:62:2: error: 'toggle' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This prints the correct one instead, as we did before the patch.

Fixes: 00bb820755ed ("[media] rc: Hauppauge z8f0811 can decode RC6")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agodib0700: fix nec repeat handling
Sean Young [Thu, 10 Nov 2016 16:44:49 +0000 (17:44 +0100)]
dib0700: fix nec repeat handling

When receiving a nec repeat, ensure the correct scancode is repeated
rather than a random value from the stack.  This removes the need for
the bogus uninitialized_var() and also fixes the warnings:

    drivers/media/usb/dvb-usb/dib0700_core.c: In function ‘dib0700_rc_urb_completion’:
    drivers/media/usb/dvb-usb/dib0700_core.c:679: warning: ‘protocol’ may be used uninitialized in this function

[sean addon: So after writing the patch and submitting it, I've bought the
             hardware on ebay. Without this patch you get random scancodes
             on nec repeats, which the patch indeed fixes.]

Signed-off-by: Sean Young <sean@mess.org>
Tested-by: Sean Young <sean@mess.org>
Cc: stable@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agos390: pci: don't print uninitialized data for debugging
Arnd Bergmann [Thu, 10 Nov 2016 16:44:48 +0000 (17:44 +0100)]
s390: pci: don't print uninitialized data for debugging

gcc correctly warns about an incorrect use of the 'pa' variable in case
we pass an empty scatterlist to __s390_dma_map_sg:

  arch/s390/pci/pci_dma.c: In function '__s390_dma_map_sg':
  arch/s390/pci/pci_dma.c:309:13: warning: 'pa' may be used uninitialized in this function [-Wmaybe-uninitialized]

This adds a bogus initialization to the function to sanitize the debug
output.  I would have preferred a solution without the initialization,
but I only got the report from the kbuild bot after turning on the
warning again, and didn't manage to reproduce it myself.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agonios2: fix timer initcall return value
Arnd Bergmann [Thu, 10 Nov 2016 16:44:47 +0000 (17:44 +0100)]
nios2: fix timer initcall return value

When called more than twice, the nios2_time_init() function return an
uninitialized value, as detected by gcc -Wmaybe-uninitialized

  arch/nios2/kernel/time.c: warning: 'ret' may be used uninitialized in this function

This makes it return '0' here, matching the comment above the function.

Acked-by: Ley Foon Tan <lftan@altera.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agox86: apm: avoid uninitialized data
Arnd Bergmann [Thu, 10 Nov 2016 16:44:46 +0000 (17:44 +0100)]
x86: apm: avoid uninitialized data

apm_bios_call() can fail, and return a status in its argument structure.
If that status however is zero during a call from
apm_get_power_status(), we end up using data that may have never been
set, as reported by "gcc -Wmaybe-uninitialized":

  arch/x86/kernel/apm_32.c: In function ‘apm’:
  arch/x86/kernel/apm_32.c:1729:17: error: ‘bx’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  arch/x86/kernel/apm_32.c:1835:5: error: ‘cx’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  arch/x86/kernel/apm_32.c:1730:17: note: ‘cx’ was declared here
  arch/x86/kernel/apm_32.c:1842:27: error: ‘dx’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  arch/x86/kernel/apm_32.c:1731:17: note: ‘dx’ was declared here

This changes the function to return "APM_NO_ERROR" here, which makes the
code more robust to broken BIOS versions, and avoids the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Jiri Kosina <jkosina@suse.cz>
Reviewed-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoNFSv4.1: work around -Wmaybe-uninitialized warning
Arnd Bergmann [Thu, 10 Nov 2016 16:44:45 +0000 (17:44 +0100)]
NFSv4.1: work around -Wmaybe-uninitialized warning

A bugfix introduced a harmless gcc warning in nfs4_slot_seqid_in_use if
we enable -Wmaybe-uninitialized again:

  fs/nfs/nfs4session.c:203:54: error: 'cur_seq' may be used uninitialized in this function [-Werror=maybe-uninitialized]

gcc is not smart enough to conclude that the IS_ERR/PTR_ERR pair results
in a nonzero return value here.  Using PTR_ERR_OR_ZERO() instead makes
this clear to the compiler.

Fixes: e09c978aae5b ("NFSv4.1: Fix Oopsable condition in server callback races")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoKbuild: enable -Wmaybe-uninitialized warning for "make W=1"
Arnd Bergmann [Thu, 10 Nov 2016 16:44:44 +0000 (17:44 +0100)]
Kbuild: enable -Wmaybe-uninitialized warning for "make W=1"

Traditionally, we have always had warnings about uninitialized variables
enabled, as this is part of -Wall, and generally a good idea [1], but it
also always produced false positives, mainly because this is a variation
of the halting problem and provably impossible to get right in all cases
[2].

Various people have identified cases that are particularly bad for false
positives, and in commit e74fc973b6e5 ("Turn off -Wmaybe-uninitialized
when building with -Os"), I turned off the warning for any build that
was done with CC_OPTIMIZE_FOR_SIZE.  This drastically reduced the number
of false positive warnings in the default build but unfortunately had
the side effect of turning the warning off completely in 'allmodconfig'
builds, which in turn led to a lot of warnings (both actual bugs, and
remaining false positives) to go in unnoticed.

With commit 877417e6ffb9 ("Kbuild: change CC_OPTIMIZE_FOR_SIZE
definition") enabled the warning again for allmodconfig builds in v4.7
and in v4.8-rc1, I had finally managed to address all warnings I get in
an ARM allmodconfig build and most other maybe-uninitialized warnings
for ARM randconfig builds.

However, commit 6e8d666e9253 ("Disable "maybe-uninitialized" warning
globally") was merged at the same time and disabled it completely for
all configurations, because of false-positive warnings on x86 that I had
not addressed until then.  This caused a lot of actual bugs to get
merged into mainline, and I sent several dozen patches for these during
the v4.9 development cycle.  Most of these are actual bugs, some are for
correct code that is safe because it is only called under external
constraints that make it impossible to run into the case that gcc sees,
and in a few cases gcc is just stupid and finds something that can
obviously never happen.

I have now done a few thousand randconfig builds on x86 and collected
all patches that I needed to address every single warning I got (I can
provide the combined patch for the other warnings if anyone is
interested), so I hope we can get the warning back and let people catch
the actual bugs earlier.

This reverts the change to disable the warning completely and for now
brings it back at the "make W=1" level, so we can get it merged into
mainline without introducing false positives.  A follow-up patch enables
it on all levels unless some configuration option turns it off because
of false-positives.

Link: https://rusty.ozlabs.org/?p=232
Link: https://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agolib/stackdepot: export save/fetch stack for drivers
Chris Wilson [Thu, 10 Nov 2016 18:46:47 +0000 (10:46 -0800)]
lib/stackdepot: export save/fetch stack for drivers

Some drivers would like to record stacktraces in order to aide leak
tracing.  As stackdepot already provides a facility for only storing the
unique traces, thereby reducing the memory required, export that
functionality for use by drivers.

The code was originally created for KASAN and moved under lib in commit
cd11016e5f521 ("mm, kasan: stackdepot implementation.  Enable stackdepot
for SLAB") so that it could be shared with mm/.  In turn, we want to
share it now with drivers.

Link: http://lkml.kernel.org/r/20161108133209.22704-1-chris@chris-wilson.co.uk
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm: kmemleak: scan .data.ro_after_init
Jakub Kicinski [Thu, 10 Nov 2016 18:46:44 +0000 (10:46 -0800)]
mm: kmemleak: scan .data.ro_after_init

Limit the number of kmemleak false positives by including
.data.ro_after_init in memory scanning.  To achieve this we need to add
symbols for start and end of the section to the linker scripts.

The problem was been uncovered by commit 56989f6d8568 ("genetlink: mark
families as __ro_after_init").

Link: http://lkml.kernel.org/r/1478274173-15218-1-git-send-email-jakub.kicinski@netronome.com
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomemcg: prevent memcg caches to be both OFF_SLAB & OBJFREELIST_SLAB
Greg Thelen [Thu, 10 Nov 2016 18:46:41 +0000 (10:46 -0800)]
memcg: prevent memcg caches to be both OFF_SLAB & OBJFREELIST_SLAB

While testing OBJFREELIST_SLAB integration with pagealloc, we found a
bug where kmem_cache(sys) would be created with both CFLGS_OFF_SLAB &
CFLGS_OBJFREELIST_SLAB.  When it happened, critical allocations needed
for loading drivers or creating new caches will fail.

The original kmem_cache is created early making OFF_SLAB not possible.
When kmem_cache(sys) is created, OFF_SLAB is possible and if pagealloc
is enabled it will try to enable it first under certain conditions.
Given kmem_cache(sys) reuses the original flag, you can have both flags
at the same time resulting in allocation failures and odd behaviors.

This fix discards allocator specific flags from memcg before calling
create_cache.

The bug exists since 4.6-rc1 and affects testing debug pagealloc
configurations.

Fixes: b03a017bebc4 ("mm/slab: introduce new slab management type, OBJFREELIST_SLAB")
Link: http://lkml.kernel.org/r/1478553075-120242-1-git-send-email-thgarnie@google.com
Signed-off-by: Greg Thelen <gthelen@google.com>
Signed-off-by: Thomas Garnier <thgarnie@google.com>
Tested-by: Thomas Garnier <thgarnie@google.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agocoredump: fix unfreezable coredumping task
Andrey Ryabinin [Thu, 10 Nov 2016 18:46:38 +0000 (10:46 -0800)]
coredump: fix unfreezable coredumping task

It could be not possible to freeze coredumping task when it waits for
'core_state->startup' completion, because threads are frozen in
get_signal() before they got a chance to complete 'core_state->startup'.

Inability to freeze a task during suspend will cause suspend to fail.
Also CRIU uses cgroup freezer during dump operation.  So with an
unfreezable task the CRIU dump will fail because it waits for a
transition from 'FREEZING' to 'FROZEN' state which will never happen.

Use freezer_do_not_count() to tell freezer to ignore coredumping task
while it waits for core_state->startup completion.

Link: http://lkml.kernel.org/r/1475225434-3753-1-git-send-email-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Tejun Heo <tj@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm/filemap: don't allow partially uptodate page for pipes
Eryu Guan [Thu, 10 Nov 2016 18:46:35 +0000 (10:46 -0800)]
mm/filemap: don't allow partially uptodate page for pipes

Starting from 4.9-rc1 kernel, I started noticing some test failures of
sendfile(2) and splice(2) (sendfile0N and splice01 from LTP) when
testing on sub-page block size filesystems (tested both XFS and ext4),
these syscalls start to return EIO in the tests.  e.g.

  sendfile02    1  TFAIL  :  sendfile02.c:133: sendfile(2) failed to return expected value, expected: 26, got: -1
  sendfile02    2  TFAIL  :  sendfile02.c:133: sendfile(2) failed to return expected value, expected: 24, got: -1
  sendfile02    3  TFAIL  :  sendfile02.c:133: sendfile(2) failed to return expected value, expected: 22, got: -1
  sendfile02    4  TFAIL  :  sendfile02.c:133: sendfile(2) failed to return expected value, expected: 20, got: -1

This is because that in sub-page block size cases, we don't need the
whole page to be uptodate, only the part we care about is uptodate is OK
(if fs has ->is_partially_uptodate defined).

But page_cache_pipe_buf_confirm() doesn't have the ability to check the
partially-uptodate case, it needs the whole page to be uptodate.  So it
returns EIO in this case.

This is a regression introduced by commit 82c156f85384 ("switch
generic_file_splice_read() to use of ->read_iter()").  Prior to the
change, generic_file_splice_read() doesn't allow partially-uptodate page
either, so it worked fine.

Fix it by skipping the partially-uptodate check if we're working on a
pipe in do_generic_file_read(), so we read the whole page from disk as
long as the page is not uptodate.

I think the other way to fix it is to add the ability to check & allow
partially-uptodate page to page_cache_pipe_buf_confirm(), but that is
much harder to do and seems gain little.

Link: http://lkml.kernel.org/r/1477986187-12717-1-git-send-email-guaneryu@gmail.com
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm/hugetlb: fix huge page reservation leak in private mapping error paths
Mike Kravetz [Thu, 10 Nov 2016 18:46:32 +0000 (10:46 -0800)]
mm/hugetlb: fix huge page reservation leak in private mapping error paths

Error paths in hugetlb_cow() and hugetlb_no_page() may free a newly
allocated huge page.

If a reservation was associated with the huge page, alloc_huge_page()
consumed the reservation while allocating.  When the newly allocated
page is freed in free_huge_page(), it will increment the global
reservation count.  However, the reservation entry in the reserve map
will remain.

This is not an issue for shared mappings as the entry in the reserve map
indicates a reservation exists.  But, an entry in a private mapping
reserve map indicates the reservation was consumed and no longer exists.
This results in an inconsistency between the reserve map and the global
reservation count.  This 'leaks' a reserved huge page.

Create a new routine restore_reserve_on_error() to restore the reserve
entry in these specific error paths.  This routine makes use of a new
function vma_add_reservation() which will add a reserve entry for a
specific address/page.

In general, these error paths were rarely (if ever) taken on most
architectures.  However, powerpc contained arch specific code that that
resulted in an extra fault and execution of these error paths on all
private mappings.

Fixes: 67961f9db8c4 ("mm/hugetlb: fix huge page reserve accounting for private mappings)
Link: http://lkml.kernel.org/r/1476933077-23091-2-git-send-email-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reported-by: Jan Stancek <jstancek@redhat.com>
Tested-by: Jan Stancek <jstancek@redhat.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Kirill A . Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoocfs2: fix not enough credit panic
Junxiao Bi [Thu, 10 Nov 2016 18:46:29 +0000 (10:46 -0800)]
ocfs2: fix not enough credit panic

The following panic was caught when run ocfs2 disconfig single test
(block size 512 and cluster size 8192).  ocfs2_journal_dirty() return
-ENOSPC, that means credits were used up.

The total credit should include 3 times of "num_dx_leaves" from
ocfs2_dx_dir_rebalance(), because 2 times will be consumed in
ocfs2_dx_dir_transfer_leaf() and 1 time will be consumed in
ocfs2_dx_dir_new_cluster() -> __ocfs2_dx_dir_new_cluster() ->
ocfs2_dx_dir_format_cluster().  But only two times is included in
ocfs2_dx_dir_rebalance_credits(), fix it.

This can cause read-only fs(v4.1+) or panic for mainline linux depending
on mount option.

  ------------[ cut here ]------------
  kernel BUG at fs/ocfs2/journal.c:775!
  invalid opcode: 0000 [#1] SMP
  Modules linked in: ocfs2 nfsd lockd grace nfs_acl auth_rpcgss sunrpc autofs4 ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs sd_mod sg ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables be2iscsi iscsi_boot_sysfs bnx2i cnic uio cxgb4i cxgb4 cxgb3i libcxgbi cxgb3 mdio ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr ipv6 iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ppdev xen_kbdfront xen_netfront fb_sys_fops sysimgblt sysfillrect syscopyarea parport_pc parport acpi_cpufreq i2c_piix4 i2c_core pcspkr ext4 jbd2 mbcache xen_blkfront floppy pata_acpi ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod
  CPU: 2 PID: 10601 Comm: dd Not tainted 4.1.12-71.el6uek.bug24939243.x86_64 #2
  Hardware name: Xen HVM domU, BIOS 4.4.4OVM 02/11/2016
  task: ffff8800b6de6200 ti: ffff8800a7d48000 task.ti: ffff8800a7d48000
  RIP: ocfs2_journal_dirty+0xa7/0xb0 [ocfs2]
  RSP: 0018:ffff8800a7d4b6d8  EFLAGS: 00010286
  RAX: 00000000ffffffe4 RBX: 00000000814d0a9c RCX: 00000000000004f9
  RDX: ffffffffa008e990 RSI: ffffffffa008f1ee RDI: ffff8800622b6460
  RBP: ffff8800a7d4b6f8 R08: ffffffffa008f288 R09: ffff8800622b6460
  R10: 0000000000000000 R11: 0000000000000282 R12: 0000000002c8421e
  R13: ffff88006d0cad00 R14: ffff880092beef60 R15: 0000000000000070
  FS:  00007f9b83e92700(0000) GS:ffff8800be880000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007fb2c0d1a000 CR3: 0000000008f80000 CR4: 00000000000406e0
  Call Trace:
    ocfs2_dx_dir_transfer_leaf+0x159/0x1a0 [ocfs2]
    ocfs2_dx_dir_rebalance+0xd9b/0xea0 [ocfs2]
    ocfs2_find_dir_space_dx+0xd3/0x300 [ocfs2]
    ocfs2_prepare_dx_dir_for_insert+0x219/0x450 [ocfs2]
    ocfs2_prepare_dir_for_insert+0x1d6/0x580 [ocfs2]
    ocfs2_mknod+0x5a2/0x1400 [ocfs2]
    ocfs2_create+0x73/0x180 [ocfs2]
    vfs_create+0xd8/0x100
    lookup_open+0x185/0x1c0
    do_last+0x36d/0x780
    path_openat+0x92/0x470
    do_filp_open+0x4a/0xa0
    do_sys_open+0x11a/0x230
    SyS_open+0x1e/0x20
    system_call_fastpath+0x12/0x71
  Code: 1d 3f 29 09 00 48 85 db 74 1f 48 8b 03 0f 1f 80 00 00 00 00 48 8b 7b 08 48 83 c3 10 4c 89 e6 ff d0 48 8b 03 48 85 c0 75 eb eb 90 <0f> 0b eb fe 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54
  RIP  ocfs2_journal_dirty+0xa7/0xb0 [ocfs2]
  ---[ end trace 91ac5312a6ee1288 ]---
  Kernel panic - not syncing: Fatal exception
  Kernel Offset: disabled

Link: http://lkml.kernel.org/r/1478248135-31963-1-git-send-email-junxiao.bi@oracle.com
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Joseph Qi <joseph.qi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoRevert "console: don't prefer first registered if DT specifies stdout-path"
Hans de Goede [Thu, 10 Nov 2016 18:46:26 +0000 (10:46 -0800)]
Revert "console: don't prefer first registered if DT specifies stdout-path"

This reverts commit 05fd007e4629 ("console: don't prefer first
registered if DT specifies stdout-path").

The reverted commit changes existing behavior on which many ARM boards
rely.  Many ARM small-board-computers, like e.g.  the Raspberry Pi have
both a video output and a serial console.  Depending on whether the user
is using the device as a more regular computer; or as a headless device
we need to have the console on either one or the other.

Many users rely on the kernel behavior of the console being present on
both outputs, before the reverted commit the console setup with no
console= kernel arguments on an ARM board which sets stdout-path in dt
would look like this:

  [root@localhost ~]# cat /proc/consoles
  ttyS0                -W- (EC p a)    4:64
  tty0                 -WU (E  p  )    4:1

Where as after the reverted commit, it looks like this:

  [root@localhost ~]# cat /proc/consoles
  ttyS0                -W- (EC p a)    4:64

This commit reverts commit 05fd007e4629 ("console: don't prefer first
registered if DT specifies stdout-path") restoring the original
behavior.

Fixes: 05fd007e4629 ("console: don't prefer first registered if DT specifies stdout-path")
Link: http://lkml.kernel.org/r/20161104121135.4780-2-hdegoede@redhat.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm: hwpoison: fix thp split handling in memory_failure()
Naoya Horiguchi [Thu, 10 Nov 2016 18:46:23 +0000 (10:46 -0800)]
mm: hwpoison: fix thp split handling in memory_failure()

When memory_failure() runs on a thp tail page after pmd is split, we
trigger the following VM_BUG_ON_PAGE():

   page:ffffd7cd819b0040 count:0 mapcount:0 mapping:         (null) index:0x1
   flags: 0x1fffc000400000(hwpoison)
   page dumped because: VM_BUG_ON_PAGE(!page_count(p))
   ------------[ cut here ]------------
   kernel BUG at /src/linux-dev/mm/memory-failure.c:1132!

memory_failure() passed refcount and page lock from tail page to head
page, which is not needed because we can pass any subpage to
split_huge_page().

Fixes: 61f5d698cc97 ("mm: re-enable THP")
Link: http://lkml.kernel.org/r/1477961577-7183-1-git-send-email-n-horiguchi@ah.jp.nec.com
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: <stable@vger.kernel.org> [4.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoswapfile: fix memory corruption via malformed swapfile
Jann Horn [Thu, 10 Nov 2016 18:46:19 +0000 (10:46 -0800)]
swapfile: fix memory corruption via malformed swapfile

When root activates a swap partition whose header has the wrong
endianness, nr_badpages elements of badpages are swabbed before
nr_badpages has been checked, leading to a buffer overrun of up to 8GB.

This normally is not a security issue because it can only be exploited
by root (more specifically, a process with CAP_SYS_ADMIN or the ability
to modify a swap file/partition), and such a process can already e.g.
modify swapped-out memory of any other userspace process on the system.

Link: http://lkml.kernel.org/r/1477949533-2509-1-git-send-email-jann@thejh.net
Signed-off-by: Jann Horn <jann@thejh.net>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm/cma.c: check the max limit for cma allocation
Shiraz Hashim [Thu, 10 Nov 2016 18:46:16 +0000 (10:46 -0800)]
mm/cma.c: check the max limit for cma allocation

CMA allocation request size is represented by size_t that gets truncated
when same is passed as int to bitmap_find_next_zero_area_off.

We observe that during fuzz testing when cma allocation request is too
high, bitmap_find_next_zero_area_off still returns success due to the
truncation.  This leads to kernel crash, as subsequent code assumes that
requested memory is available.

Fail cma allocation in case the request breaches the corresponding cma
region size.

Link: http://lkml.kernel.org/r/1478189211-3467-1-git-send-email-shashim@codeaurora.org
Signed-off-by: Shiraz Hashim <shashim@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoscripts/bloat-o-meter: fix SIGPIPE
Alexey Dobriyan [Thu, 10 Nov 2016 18:46:13 +0000 (10:46 -0800)]
scripts/bloat-o-meter: fix SIGPIPE

Fix piping output to a program which quickly exits (read: head -n1)

$ ./scripts/bloat-o-meter ../vmlinux-000 ../obj/vmlinux | head -n1
add/remove: 0/0 grow/shrink: 9/60 up/down: 124/-305 (-181)
close failed in file object destructor:
sys.excepthook is missing
lost sys.stderr

Link: http://lkml.kernel.org/r/20161028204618.GA29923@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agoshmem: fix pageflags after swapping DMA32 object
Hugh Dickins [Thu, 10 Nov 2016 18:46:11 +0000 (10:46 -0800)]
shmem: fix pageflags after swapping DMA32 object

If shmem_alloc_page() does not set PageLocked and PageSwapBacked, then
shmem_replace_page() needs to do so for itself.  Without this, it puts
newpage on the wrong lru, re-unlocks the unlocked newpage, and system
descends into "Bad page" reports and freeze; or if CONFIG_DEBUG_VM=y, it
hits an earlier VM_BUG_ON_PAGE(!PageLocked), depending on config.

But shmem_replace_page() is not a common path: it's only called when
swapin (or swapoff) finds the page was already read into an unsuitable
zone: usually all zones are suitable, but gem objects for a few drm
devices (gma500, omapdrm, crestline, broadwater) require zone DMA32 if
there's more than 4GB of ram.

Fixes: 800d8c63b2e9 ("shmem: add huge pages support")
Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1611062003510.11253@eggly.anvils
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: <stable@vger.kernel.org> [4.8.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm, frontswap: make sure allocated frontswap map is assigned
Vlastimil Babka [Thu, 10 Nov 2016 18:46:07 +0000 (10:46 -0800)]
mm, frontswap: make sure allocated frontswap map is assigned

Christian Borntraeger reports:

With commit 8ea1d2a1985a ("mm, frontswap: convert frontswap_enabled to
static key") kmemleak complains about a memory leak in swapon

    unreferenced object 0x3e09ba56000 (size 32112640):
      comm "swapon", pid 7852, jiffies 4294968787 (age 1490.770s)
      hex dump (first 32 bytes):
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
      backtrace:
         __vmalloc_node_range+0x194/0x2d8
         vzalloc+0x58/0x68
         SyS_swapon+0xd60/0x12f8
         system_call+0xd6/0x270

Turns out kmemleak is right.  We now allocate the frontswap map
depending on the kernel config (and no longer on the enablement)

  swapfile.c:
  [...]
      if (IS_ENABLED(CONFIG_FRONTSWAP))
                frontswap_map = vzalloc(BITS_TO_LONGS(maxpages) * sizeof(long));

but later on this is passed along
  --> enable_swap_info(p, prio, swap_map, cluster_info, frontswap_map);

and ignored if frontswap is disabled
  --> frontswap_init(p->type, frontswap_map);

  static inline void frontswap_init(unsigned type, unsigned long *map)
  {
        if (frontswap_enabled())
                __frontswap_init(type, map);
  }

Thing is, that frontswap map is never freed.

The leakage is relatively not that bad, because swapon is an infrequent
and privileged operation.  However, if the first frontswap backend is
registered after a swap type has been already enabled, it will WARN_ON
in frontswap_register_ops() and frontswap will not be available for the
swap type.

Fix this by making sure the map is assigned by frontswap_init() as long
as CONFIG_FRONTSWAP is enabled.

Fixes: 8ea1d2a1985a ("mm, frontswap: convert frontswap_enabled to static key")
Link: http://lkml.kernel.org/r/20161026134220.2566-1-vbabka@suse.cz
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agomm: remove extra newline from allocation stall warning
Tetsuo Handa [Thu, 10 Nov 2016 18:46:04 +0000 (10:46 -0800)]
mm: remove extra newline from allocation stall warning

Commit 63f53dea0c98 ("mm: warn about allocations which stall for too
long") by error embedded "\n" in the format string, resulting in strange
output.

  [  722.876655] kworker/0:1: page alloction stalls for 160001ms, order:0
  [  722.876656] , mode:0x2400000(GFP_NOIO)
  [  722.876657] CPU: 0 PID: 6966 Comm: kworker/0:1 Not tainted 4.8.0+ #69

Link: http://lkml.kernel.org/r/1476026219-7974-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
8 years agodrm/amdgpu: Attach exclusive fence to prime exported bo's. (v5)
Mario Kleiner [Wed, 9 Nov 2016 01:25:15 +0000 (02:25 +0100)]
drm/amdgpu: Attach exclusive fence to prime exported bo's. (v5)

External clients which import our bo's wait only
for exclusive dmabuf-fences, not on shared ones,
ditto for bo's which we import from external
providers and write to.

Therefore attach exclusive fences on prime shared buffers
if our exported buffer gets imported by an external
client, or if we import a buffer from an external
exporter.

See discussion in thread:
https://lists.freedesktop.org/archives/dri-devel/2016-October/122370.html

Prime export tested on Intel iGPU + AMD Tonga dGPU as
DRI3/Present Prime render offload, and with the Tonga
standalone as primary gpu.

v2: Add a wait for all shared fences before prime export,
    as suggested by Christian Koenig.

v3: - Mark buffer prime_exported in amdgpu_gem_prime_pin,
    so we only use the exclusive fence when exporting a
    bo to external clients like a separate iGPU, but not
    when exporting/importing from/to ourselves as part of
    regular DRI3 fd passing.

    - Propagate failure of reservation_object_wait_rcu back
    to caller.

v4: - Switch to a prime_shared_count counter instead of a
      flag, which gets in/decremented on prime_pin/unpin, so
      we can switch back to shared fences if all clients
      detach from our exported bo.

    - Also switch to exclusive fence for prime imported bo's.

v5: - Drop lret, instead use int ret -> long ret, as proposed
      by Christian.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95472
Tested-by: Mike Lothian <mike@fireburn.co.uk> (v1)
Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>.
Cc: Christian König <christian.koenig@amd.com>
Cc: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
8 years agoALSA: hda - Fix mic regression by ASRock mobo fixup
Takashi Iwai [Fri, 11 Nov 2016 11:33:20 +0000 (12:33 +0100)]
ALSA: hda - Fix mic regression by ASRock mobo fixup

The commit [1a3f099101b8: ALSA: hda - Fix surround output pins for
ASRock B150M mobo] introduced a fixup of pin configs for ASRock
mobos to fix the surround outputs.  However, this overrides the pin
configs of the mic pins as if they are outputs-only, effectively
disabling the mic inputs.  Of course, it's a regression wrt mic
functionality.

Actually the pins 0x18 and 0x1a don't need to be changed; we just need
to disable the bogus pins 0x14 and 0x15.  Then the auto-parser will
pick up mic pins as switchable and assign the surround outputs there.

This patch removes the incorrect pin overrides of NID 0x18 and 0x1a
from the ASRock fixup.

Fixes: 1a3f099101b8 ('ALSA: hda - Fix surround output pins for ASRock...')
Reported-and-tested-by: Vitor Antunes <vitor.hda@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=187431
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
8 years agoMerge tag 'kvm-arm-for-v4.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git...
Paolo Bonzini [Fri, 11 Nov 2016 10:13:36 +0000 (11:13 +0100)]
Merge tag 'kvm-arm-for-v4.9-rc4' of git://git./linux/kernel/git/kvmarm/kvmarm into HEAD

KVM/ARM updates for v4.9-rc4

- Kick the vcpu when a pending interrupt becomes pending again
- Prevent access to invalid interrupt registers
- Invalid TLBs when two vcpus from the same VM share a CPU

8 years agodrm/i915: Refresh that status of MST capable connectors in ->detect()
Ville Syrjälä [Fri, 21 Oct 2016 13:44:38 +0000 (16:44 +0300)]
drm/i915: Refresh that status of MST capable connectors in ->detect()

Once we've determined that the sink is MST capable we never end up
running through the full detect cycle again, despite getting HPDs.
Fix tht by ripping out the incorrect piece of code responsible.

This got broken when I moved the long HPD handling to the ->detect()
hook, but failed to remove the leftover code.

Cc: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Cc: drm-intel-fixes@lists.freedesktop.org
Cc: Rui Tiago Matos <tiagomatos@gmail.com>
Tested-by: Rui Tiago Matos <tiagomatos@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98323
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Tested-by: Kirill A. Shutemov <kirill@shutemov.name>
References: https://bugs.freedesktop.org/show_bug.cgi?id=98306
Fixes: 1015811609c0 ("drm/i915: Move long hpd handling into the hotplug work")
Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1477057478-29328-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
(cherry picked from commit 1aab956c7b8872fb6976328316bfad62c6e67cf8)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
8 years agodrm/i915: Grab the rotation from the passed plane state for VLV sprites
Ville Syrjälä [Mon, 7 Nov 2016 20:20:55 +0000 (22:20 +0200)]
drm/i915: Grab the rotation from the passed plane state for VLV sprites

Use the passed in plane_state instead of plane->state in
vlv_update_plane(). Currently the two are one and the same, but if we
start queuing up multiple plane updates they might not be.

Looks like this was rebase fail on my part.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Fixes: 8d0deca8c6e0 ("drm/i915: Pass 90/270 vs. 0/180 rotation info for intel_gen4_compute_page_offset()")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1478550057-24864-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
(cherry picked from commit 11df4d95b3ad9e6a6a6e0907bb200610a4d24887)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
8 years agodrm/i915: Mark CPU cache as dirty when used for rendering
Chris Wilson [Mon, 7 Nov 2016 16:52:04 +0000 (16:52 +0000)]
drm/i915: Mark CPU cache as dirty when used for rendering

On LLC, or even snooped, machines rendering via the GPU ends up in the CPU
cache. This cacheline dirt also needs to be flushed to main memory when
moving to an incoherent domain, such as the display's scanout engine.
Mostly, this happens because either the object is marked as dirty from
its first use or is avoided by setting the object into the display
domain from the start.

v2: Treat WT as not requiring a clflush prior to use on the display
engine as well.

Fixes: 0f71979ab7fb ("drm/i915: Performed deferred clflush inside set-cache-level")
References: https://bugs.freedesktop.org/show_bug.cgi?id=95414
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: <stable@vger.kernel.org> # v4.0+
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161107165204.7008-1-chris@chris-wilson.co.uk
(cherry picked from commit 7aa6ca61ee5546d74b76610894924cdb0d4a1af0)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
8 years agoperf/x86/intel/uncore: Add more Intel uncore IMC PCI IDs for SkyLake
Kan Liang [Tue, 8 Nov 2016 18:54:41 +0000 (13:54 -0500)]
perf/x86/intel/uncore: Add more Intel uncore IMC PCI IDs for SkyLake

Several uncore IMC PCI IDs are missed for Intel SkyLake.

Add the PCI IDs for SkyLake Y, U, H and S platforms.
Rename the ID macros for 0x191f and 0x190c.

The corresponding bug:

  https://bugzilla.kernel.org/show_bug.cgi?id=187301

The related datasheets are also attached in the bug entry for permanent reference.

Reported-by: Ben Widawsky <benjamin.widawsky@intel.com>
Tested-by: Ben Widawsky <benjamin.widawsky@intel.com>
Signed-off-by: Kan Liang <kan.liang@intel.com>
Reviewed-by: Ben Widawsky <benjamin.widawsky@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/1478631281-5061-1-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
8 years agoMerge branch 'topic-arcpgu-fixes' of https://github.com/foss-for-synopsys-dwc-arc...
Dave Airlie [Fri, 11 Nov 2016 01:55:11 +0000 (11:55 +1000)]
Merge branch 'topic-arcpgu-fixes' of https://github.com/foss-for-synopsys-dwc-arc-processors/linux into drm-fixes

* 'topic-arcpgu-fixes' of https://github.com/foss-for-synopsys-dwc-arc-processors/linux:
  drm/arcpgu: Accommodate adv7511 switch to DRM bridge

8 years agodrm/arcpgu: Accommodate adv7511 switch to DRM bridge
Eugeniy Paltsev [Wed, 19 Oct 2016 07:46:18 +0000 (10:46 +0300)]
drm/arcpgu: Accommodate adv7511 switch to DRM bridge

ARC PGU driver starts crashing on initialization after
'commit e12c2f645557 ("drm/i2c: adv7511: Convert to drm_bridge")'
This happenes because in "arcpgu_drm_hdmi_init" function we get pointer
of "drm_i2c_encoder_driver" structure, which doesn't exist after
adv7511 hdmi encoder interface changed from slave encoder to drm bridge.
So, when we call "encoder_init" function from this structure driver
crashes.

Bootlog:
------------------------------------->8--------------------------------
[drm] Initialized drm 1.1.0 20060810
arcpgu e0017000.pgu: arc_pgu ID: 0xabbabaab
arcpgu e0017000.pgu: assigned reserved memory node frame_buffer@9e000000
Path: (null)
CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-00001-gb5642252fa01-dirty #8
task: 9a058000 task.stack: 9a032000

[ECR   ]: 0x00220100 => Invalid Read @ 0x00000004 by insn @ 0x803934e8
[EFA   ]: 0x00000004
[BLINK ]: drm_atomic_helper_connector_dpms+0xa6/0x230
[ERET  ]: drm_atomic_helper_connector_dpms+0xa4/0x230
[STAT32]: 0x00000846 : K DE       E2 E1
BTA: 0x8016d949  SP: 0x9a033e34  FP: 0x00000000
LPS: 0x8036f6fc LPE: 0x8036f700 LPC: 0x00000000
r00: 0x8063c118 r01: 0x805b98ac r02: 0x00000b11
r03: 0x00000000 r04: 0x9a010f54 r05: 0x00000000
r06: 0x00000001 r07: 0x00000000 r08: 0x00000028
r09: 0x00000001 r10: 0x00000007 r11: 0x00000054
r12: 0x720a3033

Stack Trace:
  drm_atomic_helper_connector_dpms+0xa4/0x230
  arcpgu_drm_hdmi_init+0xbc/0x228
  arcpgu_probe+0x168/0x244
  platform_drv_probe+0x26/0x64
  really_probe+0x1f0/0x32c
  __driver_attach+0xa8/0xd0
  bus_for_each_dev+0x3c/0x74
  bus_add_driver+0xc2/0x184
  driver_register+0x50/0xec
  do_one_initcall+0x3a/0x120
  kernel_init_freeable+0x108/0x1a0
------------------------------------->8--------------------------------

Fix ARC PGU driver to be able work with drm bridge hdmi encoder
interface. The hdmi connector code isn't needed anymore as we expect
the adv7511 bridge driver to create/manage the connector.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
8 years agoPM / sleep: don't suspend parent when async child suspend_{noirq, late} fails
Brian Norris [Thu, 10 Nov 2016 01:21:08 +0000 (17:21 -0800)]
PM / sleep: don't suspend parent when async child suspend_{noirq, late} fails

Consider two devices, A and B, where B is a child of A, and B utilizes
asynchronous suspend (it does not matter whether A is sync or async). If
B fails to suspend_noirq() or suspend_late(), or is interrupted by a
wakeup (pm_wakeup_pending()), then it aborts and sets the async_error
variable. However, device A does not (immediately) check the async_error
variable; it may continue to run its own suspend_noirq()/suspend_late()
callback. This is bad.

We can resolve this problem by doing our error and wakeup checking
(particularly, for the async_error flag) after waiting for children to
suspend, instead of before. This also helps align the logic for the noirq and
late suspend cases with the logic in __device_suspend().

It's easy to observe this erroneous behavior by, for example, forcing a
device to sleep a bit in its suspend_noirq() (to ensure the parent is
waiting for the child to complete), then return an error, and watch the
parent suspend_noirq() still get called. (Or similarly, fake a wakeup
event at the right (or is it wrong?) time.)

Fixes: de377b397272 (PM / sleep: Asynchronous threads for suspend_late)
Fixes: 28b6fd6e3779 (PM / sleep: Asynchronous threads for suspend_noirq)
Reported-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
8 years agoMerge branch 'fixes-for-v4.9-rc5' of http://git.agner.ch/git/linux-drm-fsl-dcu into...
Dave Airlie [Fri, 11 Nov 2016 00:00:39 +0000 (10:00 +1000)]
Merge branch 'fixes-for-v4.9-rc5' of git.agner.ch/git/linux-drm-fsl-dcu into drm-fixes

Yet another small batch of fixes. Two of the patches I had prepared
since quite some time, but they did not seem to affect operation in
a visible manner so far. Until recently, when I discovered the third
issue (disable planes before disabling CRTC), which made the two
previous fixes necessary.

* 'fixes-for-v4.9-rc5' of http://git.agner.ch/git/linux-drm-fsl-dcu:
  drm/fsl-dcu: disable planes before disabling CRTC
  drm/fsl-dcu: update all registers on flush
  drm/fsl-dcu: do not update when modifying irq registers

8 years agosplice: remove detritus from generic_file_splice_read()
Al Viro [Thu, 10 Nov 2016 23:32:13 +0000 (18:32 -0500)]
splice: remove detritus from generic_file_splice_read()

i_size check is a leftover from the horrors that used to play with
the page cache in that function.  With the switch to ->read_iter(),
it's neither needed nor correct - for gfs2 it ends up being buggy,
since i_size is not guaranteed to be correct until later (inside
->read_iter()).

Spotted-by: Abhi Das <adas@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>