profile/common/platform/kernel/linux-artik7.git
8 years agoblock: add missing group association in bio-cloning functions
Paolo Valente [Wed, 27 Jul 2016 05:22:05 +0000 (07:22 +0200)]
block: add missing group association in bio-cloning functions

commit 20bd723ec6a3261df5e02250cd3a1fbb09a343f2 upstream.

When a bio is cloned, the newly created bio must be associated with
the same blkcg as the original bio (if BLK_CGROUP is enabled). If
this operation is not performed, then the new bio is not associated
with any group, and the group of the current task is returned when
the group of the bio is requested.

Depending on the cloning frequency, this may cause a large
percentage of the bios belonging to a given group to be treated
as if belonging to other groups (in most cases as if belonging to
the root group). The expected group isolation may thereby be broken.

This commit adds the missing association in bio-cloning functions.

Fixes: da2f0f74cf7d ("Btrfs: add support for blkio controllers")

Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Reviewed-by: Nikolay Borisov <kernel@kyup.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agometag: Fix __cmpxchg_u32 asm constraint for CMP
James Hogan [Thu, 4 Aug 2016 16:36:08 +0000 (17:36 +0100)]
metag: Fix __cmpxchg_u32 asm constraint for CMP

commit 6154c187b97ee7513046bb4eb317a89f738f13ef upstream.

The LNKGET based atomic sequence in __cmpxchg_u32 has slightly incorrect
constraints for the return value which under certain circumstances can
allow an address unit register to be used as the first operand of a CMP
instruction. This isn't a valid instruction however as the encodings
only allow a data unit to be specified. This would result in an
assembler error like the following:

  Error: failed to assemble instruction: "CMP A0.2,D0Ar6"

Fix by changing the constraint from "=&da" (assigned, early clobbered,
data or address unit register) to "=&d" (data unit register only).

The constraint for the second operand, "bd" (an op2 register where op1
is a data unit register and the instruction supports O2R) is already
correct assuming the first operand is a data unit register.

Other cases of CMP in inline asm have had their constraints checked, and
appear to all be fine.

Fixes: 6006c0d8ce94 ("metag: Atomics, locks and bitops")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoftrace/recordmcount: Work around for addition of metag magic but not relocations
Laura Abbott [Fri, 8 Jul 2016 19:18:50 +0000 (12:18 -0700)]
ftrace/recordmcount: Work around for addition of metag magic but not relocations

commit b2e1c26f0b62531636509fbcb6dab65617ed8331 upstream.

glibc recently did a sync up (94e73c95d9b5 "elf.h: Sync with the gabi
webpage") that added a #define for EM_METAG but did not add relocations

This triggers build errors:

scripts/recordmcount.c: In function 'do_file':
scripts/recordmcount.c:466:28: error: 'R_METAG_ADDR32' undeclared (first use in this function)
  case EM_METAG:  reltype = R_METAG_ADDR32;
                            ^~~~~~~~~~~~~~
scripts/recordmcount.c:466:28: note: each undeclared identifier is reported only once for each function it appears in
scripts/recordmcount.c:468:20: error: 'R_METAG_NONE' undeclared (first use in this function)
     rel_type_nop = R_METAG_NONE;
                    ^~~~~~~~~~~~

Work around this change with some more #ifdefery for the relocations.

Fedora Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1354034

Link: http://lkml.kernel.org/r/1468005530-14757-1-git-send-email-labbott@redhat.com
Cc: James Hogan <james.hogan@imgtec.com>
Fixes: 00512bdd4573 ("metag: ftrace support")
Reported-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoballoon: check the number of available pages in leak balloon
Konstantin Neumoin [Mon, 11 Jul 2016 12:28:59 +0000 (15:28 +0300)]
balloon: check the number of available pages in leak balloon

commit 37cf99e08c6fb4dcea0f9ad2b13b6daa8c76a711 upstream.

The balloon has a special mechanism that is subscribed to the oom
notification which leads to deflation for a fixed number of pages.
The number is always fixed even when the balloon is fully deflated.
But leak_balloon did not expect that the pages to deflate will be more
than taken, and raise a "BUG" in balloon_page_dequeue when page list
will be empty.

So, the simplest solution would be to check that the number of releases
pages is less or equal to the number taken pages.

Signed-off-by: Konstantin Neumoin <kneumoin@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/i915/dp: Revert "drm/i915/dp: fall back to 18 bpp when sink capability is unknown"
Mario Kleiner [Wed, 6 Jul 2016 10:05:45 +0000 (12:05 +0200)]
drm/i915/dp: Revert "drm/i915/dp: fall back to 18 bpp when sink capability is unknown"

commit 196f954e250943df414efd3d632254c29be38e59 upstream.

This reverts commit 013dd9e03872
("drm/i915/dp: fall back to 18 bpp when sink capability is unknown")

This commit introduced a regression into stable kernels,
as it reduces output color depth to 6 bpc for any video
sink connected to a Displayport connector if that sink
doesn't report a specific color depth via EDID, or if
our EDID parser doesn't actually recognize the proper
bpc from EDID.

Affected are active DisplayPort->VGA converters and
active DisplayPort->DVI converters. Both should be
able to handle 8 bpc, but are degraded to 6 bpc with
this patch.

The reverted commit was meant to fix
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=105331

A followup patch implements a fix for that specific bug,
which is caused by a faulty EDID of the affected DP panel
by adding a new EDID quirk for that panel.

DP 18 bpp fallback handling and other improvements to
DP sink bpc detection will be handled for future
kernels in a separate series of patches.

Please backport to stable.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/i915: Never fully mask the the EI up rps interrupt on SNB/IVB
Ville Syrjälä [Mon, 23 May 2016 14:42:48 +0000 (17:42 +0300)]
drm/i915: Never fully mask the the EI up rps interrupt on SNB/IVB

commit a7b4667a00025ac28300737c868bd4818b6d8c4d upstream.

SNB (and IVB too I suppose) starts to misbehave if the GPU gets stuck
in an infinite batch buffer loop. The GPU apparently hogs something
critical and CPUs start to lose interrupts and whatnot. We can keep
the system limping along by unmasking some interrupts in
GEN6_PMINTRMSK. The EI up interrupt has been previously chosen for
that task, so let's never mask it.

v2: s/gen6_rps_pm_mask/gen6_sanitize_rps_pm_mask/ (Chris)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93122
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1464014568-4529-1-git-send-email-ville.syrjala@linux.intel.com
(cherry picked from commit 12c100bfa5d9103b6c4d43636fee09c31e75605a)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/edid: Add 6 bpc quirk for display AEO model 0.
Mario Kleiner [Wed, 6 Jul 2016 10:05:44 +0000 (12:05 +0200)]
drm/edid: Add 6 bpc quirk for display AEO model 0.

commit e10aec652f31ec61d6a0b4d00d8ef8d2b66fa0fd upstream.

Bugzilla https://bugzilla.kernel.org/show_bug.cgi?id=105331
reports that the "AEO model 0" display is driven with 8 bpc
without dithering by default, which looks bad because that
panel is apparently a 6 bpc DP panel with faulty EDID.

A fix for this was made by commit 013dd9e03872
("drm/i915/dp: fall back to 18 bpp when sink capability is unknown").

That commit triggers new regressions in precision for DP->DVI and
DP->VGA displays. A patch is out to revert that commit, but it will
revert video output for the AEO model 0 panel to 8 bpc without
dithering.

The EDID 1.3 of that panel, as decoded from the xrandr output
attached to that bugzilla bug report, is somewhat faulty, and beyond
other problems also sets the "DFP 1.x compliant TMDS" bit, which
according to DFP spec means to drive the panel with 8 bpc and
no dithering in absence of other colorimetry information.

Try to make the original bug reporter happy despite the
faulty EDID by adding a quirk to mark that panel as 6 bpc,
so 6 bpc output with dithering creates a nice picture.

Tested by injecting the edid from the fdo bug into a DP connector
via drm_kms_helper.edid_firmware and verifying the 6 bpc + dithering
is selected.

This patch should be backported to stable.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm: Restore double clflush on the last partial cacheline
Chris Wilson [Thu, 7 Jul 2016 08:41:12 +0000 (09:41 +0100)]
drm: Restore double clflush on the last partial cacheline

commit 396f5d62d1a5fd99421855a08ffdef8edb43c76e upstream.

This effectively reverts

commit afcd950cafea6e27b739fe7772cbbeed37d05b8b
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Wed Jun 10 15:58:01 2015 +0100

    drm: Avoid the double clflush on the last cache line in drm_clflush_virt_range()

as we have observed issues with serialisation of the clflush operations
on Baytrail+ Atoms with partial updates. Applying the double flush on the
last cacheline forces that clflush to be ordered with respect to the
previous clflush, and the mfence then protects against prefetches crossing
the clflush boundary.

The same issue can be demonstrated in userspace with igt/gem_exec_flush.

Fixes: afcd950cafea6 (drm: Avoid the double clflush on the last cache...)
Testcase: igt/gem_concurrent_blit
Testcase: igt/gem_partial_pread_pwrite
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92845
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: dri-devel@lists.freedesktop.org
Cc: Akash Goel <akash.goel@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1467880930-23082-6-git-send-email-chris@chris-wilson.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/nouveau/fbcon: fix font width not divisible by 8
Mikulas Patocka [Thu, 28 Jul 2016 22:56:13 +0000 (18:56 -0400)]
drm/nouveau/fbcon: fix font width not divisible by 8

commit 28668f43b8e421634e1623f72a879812288dd06b upstream.

The patch f045f459d925 ("drm/nouveau/fbcon: fix out-of-bounds memory accesses")
tries to fix some out of memory accesses. Unfortunatelly, the patch breaks the
display when using fonts with width that is not divisiable by 8.

The monochrome bitmap for each character is stored in memory by lines from top
to bottom. Each line is padded to a full byte.

For example, for 22x11 font, each line is padded to 16 bits, so each
character is consuming 44 bytes total, that is 11 32-bit words. The patch
f045f459d925 changed the logic to "dsize = ALIGN(image->width *
image->height, 32) >> 5", that is just 8 words - this is incorrect and it
causes display corruption.

This patch adds the necesary padding of lines to 8 bytes.

This patch should be backported to stable kernels where f045f459d925 was
backported.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: f045f459d925 ("drm/nouveau/fbcon: fix out-of-bounds memory accesses")
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/nouveau/gr/nv3x: fix instobj write offsets in gr setup
Ilia Mirkin [Wed, 27 Jul 2016 23:16:39 +0000 (19:16 -0400)]
drm/nouveau/gr/nv3x: fix instobj write offsets in gr setup

commit d0e62ef6ed257715a88d0e5d7cd850a1695429e2 upstream.

This should fix some unaligned access warnings. This is also likely to
fix non-descript issues on nv30/nv34 as a result of incorrect channel
setup.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96836
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/nouveau: check for supported chipset before booting fbdev off the hw
Ben Skeggs [Tue, 12 Jul 2016 01:57:07 +0000 (11:57 +1000)]
drm/nouveau: check for supported chipset before booting fbdev off the hw

commit 0e67bed2c765ff0fdaec62c963881f5416fe3692 upstream.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/radeon: support backlight control for UNIPHY3
Alex Deucher [Fri, 8 Jul 2016 21:27:04 +0000 (17:27 -0400)]
drm/radeon: support backlight control for UNIPHY3

commit d3200be6c423afa1c34f7e39e9f6d04dd5b0af9d upstream.

Same interface as other UNIPHY blocks

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/radeon: fix firmware info version checks
Alex Deucher [Wed, 27 Jul 2016 19:28:56 +0000 (15:28 -0400)]
drm/radeon: fix firmware info version checks

commit 3edc38a0facef45ee22af8afdce3737f421f36ab upstream.

Some of the checks didn't handle frev 2 tables properly.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/radeon: Poll for both connect/disconnect on analog connectors
Lyude [Fri, 24 Jun 2016 21:54:31 +0000 (17:54 -0400)]
drm/radeon: Poll for both connect/disconnect on analog connectors

commit 14ff8d48f2235295dfb3117693008e367b49cdb5 upstream.

DRM_CONNECTOR_POLL_CONNECT only enables polling for connections, not
disconnections. Because of this, we end up losing hotplug polling for
analog connectors once they get connected.

Easy way to reproduce:
 - Grab a machine with a radeon GPU and a VGA port
 - Plug a monitor into the VGA port, wait for it to update the connector
   from disconnected to connected
 - Disconnect the monitor on VGA, a hotplug event is never sent for the
   removal of the connector.

Originally, only using DRM_CONNECTOR_POLL_CONNECT might have been a good
idea since doing VGA polling can sometimes result in having to mess with
the DAC voltages to figure out whether or not there's actually something
there since VGA doesn't have HPD. Doing this would have the potential of
showing visible artifacts on the screen every time we ran a poll while a
VGA display was connected. Luckily, radeon_vga_detect() only resorts to
this sort of polling if the poll is forced, and DRM's polling helper
doesn't force it's polls.

Additionally, this removes some assignments to connector->polled that
weren't actually doing anything.

Signed-off-by: Lyude <cpaul@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/radeon: add a delay after ATPX dGPU power off
Alex Deucher [Wed, 1 Jun 2016 16:58:36 +0000 (12:58 -0400)]
drm/radeon: add a delay after ATPX dGPU power off

commit d814b24fb74cb9797d70cb8053961447c5879a5c upstream.

ATPX dGPU power control requires a 200ms delay between
power off and on.  This should fix dGPU failures on
resume from power off.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/amdgpu/gmc7: add missing mullins case
Alex Deucher [Fri, 29 Jul 2016 22:03:42 +0000 (18:03 -0400)]
drm/amdgpu/gmc7: add missing mullins case

commit 7f555c8e5a84b348c2b76f4ca78eae7222354c03 upstream.

Looks like this got missed when we ported the code from radeon.

Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/amdgpu: fix firmware info version checks
Alex Deucher [Wed, 27 Jul 2016 19:31:59 +0000 (15:31 -0400)]
drm/amdgpu: fix firmware info version checks

commit a8a04c994d41a489eb0f2899893209e04e030153 upstream.

Some of the checks didn't handle frev 2 tables properly.
amdgpu doesn't support any tables pre-frev 2, so drop
the checks.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/amdgpu: Disable RPM helpers while reprobing connectors on resume
Lyude [Mon, 18 Jul 2016 15:41:37 +0000 (11:41 -0400)]
drm/amdgpu: Disable RPM helpers while reprobing connectors on resume

commit 23a1a9e54e71593fe5657e883662995d181d2d6b upstream.

Just about all of amdgpu's connector probing functions try to acquire
runtime PM refs. If we try to do this in the context of
amdgpu_resume_kms by calling drm_helper_hpd_irq_event(), we end up
deadlocking the system.

Since we're guaranteed to be holding the spinlock for RPM in
amdgpu_resume_kms, and we already know the GPU is in working order, we
need to prevent the RPM helpers from trying to run during the initial
connector reprobe on resume.

There's a couple of solutions I've explored for fixing this, but this
one by far seems to be the simplest and most reliable (plus I'm pretty
sure that's what disable_depth is there for anyway).

Reproduction recipe:
  - Get any laptop dual GPUs using PRIME
  - Make sure runtime PM is enabled for amdgpu
  - Boot the machine
  - If the machine managed to boot without hanging, switch out of X to
    another VT. This should definitely cause X to hang infinitely.

Changes since v1:
  - add appropriate #ifdef checks for CONFIG_PM. This is not very
    useful, but it appears some kernel test suites test compiling amdgpu
    with CONFIG_PM disabled, which results in this patch breaking the builds
    if we don't include this #ifdef

Cc: Alex Deucher <alexdeucher@gmail.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Lyude <cpaul@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/amdgpu: support backlight control for UNIPHY3
Alex Deucher [Fri, 8 Jul 2016 21:19:59 +0000 (17:19 -0400)]
drm/amdgpu: support backlight control for UNIPHY3

commit dba6c4fa26ccf47661be5b68dba87e746fa137d8 upstream.

Same interface as other UNIPHY blocks

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/amdgpu: Poll for both connect/disconnect on analog connectors
Lyude [Fri, 24 Jun 2016 21:54:32 +0000 (17:54 -0400)]
drm/amdgpu: Poll for both connect/disconnect on analog connectors

commit b636a1b3d624b49b23cc1be2f9f6bcbb89aca855 upstream.

DRM_CONNECTOR_POLL_CONNECT only enables polling for connections, not
disconnections. Because of this, we end up losing hotplug polling for
analog connectors once they get connected.

Easy way to reproduce:
 - Grab a machine with an AMD GPU and a VGA port
 - Plug a monitor into the VGA port, wait for it to update the connector
   from disconnected to connected
 - Disconnect the monitor on VGA, a hotplug event is never sent for the
   removal of the connector.

Originally, only using DRM_CONNECTOR_POLL_CONNECT might have been a good
idea since doing VGA polling can sometimes result in having to mess with
the DAC voltages to figure out whether or not there's actually something
there since VGA doesn't have HPD. Doing this would have the potential of
showing visible artifacts on the screen every time we ran a poll while a
VGA display was connected. Luckily, amdgpu_vga_detect() only resorts to
this sort of polling if the poll is forced, and DRM's polling helper
doesn't force it's polls.

Additionally, this removes some assignments to connector->polled that
weren't actually doing anything.

Signed-off-by: Lyude <cpaul@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/amdgpu: add a delay after ATPX dGPU power off
Alex Deucher [Wed, 1 Jun 2016 16:54:33 +0000 (12:54 -0400)]
drm/amdgpu: add a delay after ATPX dGPU power off

commit f81eb1a349d47694fe1e688336ca1b40ea3e248a upstream.

ATPX dGPU power control requires a 200ms delay between
power off and on.  This should fix dGPU failures on
resume from power off.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agow1:omap_hdq: fix regression
H. Nikolaus Schaller [Tue, 2 Aug 2016 21:07:12 +0000 (14:07 -0700)]
w1:omap_hdq: fix regression

commit ecfaf0c42fc4306b5ec4bf6be01b66f8fe9a9733 upstream.

Commit e93762bbf681 ("w1: masters: omap_hdq: add support for 1-wire
mode") added a statement to clear the hdq_irqstatus flags in
hdq_read_byte().

If the hdq reading process is scheduled slowly or interrupts are
disabled for a while the hardware read activity might already be
finished on entry of hdq_read_byte().  And hdq_isr() already has set the
hdq_irqstatus to 0x6 (can be seen in debug mode) denoting that both, the
TXCOMPLETE and RXCOMPLETE interrupts occurred in parallel.

This means there is no need to wait and the hdq_read_byte() can just
read the byte from the hdq controller.

By resetting hdq_irqstatus to 0 the read process is forced to be always
waiting again (because the if statement always succeeds) but the
hardware will not issue another RXCOMPLETE interrupt.  This results in a
false timeout.

After such a situation the hdq bus hangs.

Link: http://lkml.kernel.org/r/b724765f87ad276a69625bc19806c8c8844c4590.1469513669.git.hns@goldelico.com
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agonetlabel: add address family checks to netlbl_{sock,req}_delattr()
Paul Moore [Mon, 6 Jun 2016 19:17:20 +0000 (15:17 -0400)]
netlabel: add address family checks to netlbl_{sock,req}_delattr()

commit 0e0e36774081534783aa8eeb9f6fbddf98d3c061 upstream.

It seems risky to always rely on the caller to ensure the socket's
address family is correct before passing it to the NetLabel kAPI,
especially since we see at least one LSM which didn't. Add address
family checks to the *_delattr() functions to help prevent future
problems.

Reported-by: Maninder Singh <maninder1.s@samsung.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoARM: dts: sunxi: Add a startup delay for fixed regulator enabled phys
Hans de Goede [Sat, 4 Jun 2016 10:58:39 +0000 (12:58 +0200)]
ARM: dts: sunxi: Add a startup delay for fixed regulator enabled phys

commit fc51b632c7b047c25807023b76f3877aed19c770 upstream.

It seems that recent kernels have a shorter timeout when scanning for
ethernet phys causing us to hit a timeout on boards where the phy's
regulator gets enabled just before scanning, which leads to non working
ethernet.

A 10ms startup delay seems to be enough to fix it, this commit adds a
20ms startup delay just to be safe.

This has been tested on a sun4i-a10-a1000 and sun5i-a10s-wobo-i5 board,
both of which have non-working ethernet on recent kernels without this
fix.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoaudit: fix a double fetch in audit_log_single_execve_arg()
Paul Moore [Tue, 19 Jul 2016 21:42:57 +0000 (17:42 -0400)]
audit: fix a double fetch in audit_log_single_execve_arg()

commit 43761473c254b45883a64441dd0bc85a42f3645c upstream.

There is a double fetch problem in audit_log_single_execve_arg()
where we first check the execve(2) argumnets for any "bad" characters
which would require hex encoding and then re-fetch the arguments for
logging in the audit record[1].  Of course this leaves a window of
opportunity for an unsavory application to munge with the data.

This patch reworks things by only fetching the argument data once[2]
into a buffer where it is scanned and logged into the audit
records(s).  In addition to fixing the double fetch, this patch
improves on the original code in a few other ways: better handling
of large arguments which require encoding, stricter record length
checking, and some performance improvements (completely unverified,
but we got rid of some strlen() calls, that's got to be a good
thing).

As part of the development of this patch, I've also created a basic
regression test for the audit-testsuite, the test can be tracked on
GitHub at the following link:

 * https://github.com/linux-audit/audit-testsuite/issues/25

[1] If you pay careful attention, there is actually a triple fetch
problem due to a strnlen_user() call at the top of the function.

[2] This is a tiny white lie, we do make a call to strnlen_user()
prior to fetching the argument data.  I don't like it, but due to the
way the audit record is structured we really have no choice unless we
copy the entire argument at once (which would require a rather
wasteful allocation).  The good news is that with this patch the
kernel no longer relies on this strnlen_user() value for anything
beyond recording it in the log, we also update it with a trustworthy
value whenever possible.

Reported-by: Pengfei Wang <wpengfeinudt@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoiommu/amd: Update Alias-DTE in update_device_table()
Joerg Roedel [Tue, 26 Jul 2016 13:18:54 +0000 (15:18 +0200)]
iommu/amd: Update Alias-DTE in update_device_table()

commit 3254de6bf74fe94c197c9f819fe62a3a3c36f073 upstream.

Not doing so might cause IO-Page-Faults when a device uses
an alias request-id and the alias-dte is left in a lower
page-mode which does not cover the address allocated from
the iova-allocator.

Fixes: 492667dacc0a ('x86/amd-iommu: Remove amd_iommu_pd_table')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoiommu/amd: Init unity mappings only for dma_ops domains
Joerg Roedel [Wed, 13 Jul 2016 10:35:24 +0000 (12:35 +0200)]
iommu/amd: Init unity mappings only for dma_ops domains

commit b548e786ce47017107765bbeb0f100202525ea83 upstream.

The default domain for a device might also be
identity-mapped. In this case the kernel would crash when
unity mappings are defined for the device. Fix that by
making sure the domain is a dma_ops domain.

Fixes: 0bb6e243d7fb ('iommu/amd: Support IOMMU_DOMAIN_DMA type allocation')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoiommu/amd: Handle IOMMU_DOMAIN_DMA in ops->domain_free call-back
Joerg Roedel [Thu, 7 Jul 2016 13:57:04 +0000 (15:57 +0200)]
iommu/amd: Handle IOMMU_DOMAIN_DMA in ops->domain_free call-back

commit cda7005ba2cbd0744fea343dd5b2aa637eba5b9e upstream.

This domain type is not yet handled in the
iommu_ops->domain_free() call-back. Fix that.

Fixes: 0bb6e243d7fb ('iommu/amd: Support IOMMU_DOMAIN_DMA type allocation')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoiommu/vt-d: Return error code in domain_context_mapping_one()
Wei Yang [Wed, 13 Jul 2016 13:53:21 +0000 (13:53 +0000)]
iommu/vt-d: Return error code in domain_context_mapping_one()

commit 5c365d18a73d3979db37006eaacefc0008869c0f upstream.

In 'commit <55d940430ab9> ("iommu/vt-d: Get rid of domain->iommu_lock")',
the error handling path is changed a little, which makes the function
always return 0.

This path fixes this.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Fixes: 55d940430ab9 ('iommu/vt-d: Get rid of domain->iommu_lock')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoiommu/exynos: Suppress unbinding to prevent system failure
Marek Szyprowski [Fri, 20 May 2016 13:48:21 +0000 (15:48 +0200)]
iommu/exynos: Suppress unbinding to prevent system failure

commit b54b874fbaf5e024723e50dfb035a9916d6752b4 upstream.

Removal of IOMMU driver cannot be done reliably, so Exynos IOMMU driver
doesn't support this operation. It is essential for system operation, so
it makes sense to prevent unbinding by disabling bind/unbind sysfs
feature for SYSMMU controller driver to avoid kernel ops or trashing
memory caused by such operation.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodrm/i915: Don't complain about lack of ACPI video bios
Daniel Vetter [Fri, 23 Oct 2015 09:00:06 +0000 (11:00 +0200)]
drm/i915: Don't complain about lack of ACPI video bios

commit 78c3d5fa7354774b7c8638033d46c042ebae41fb upstream.

Another CI fail we have for no reason. Totally unjustified since
nothing fails at all.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1445590806-23886-1-git-send-email-daniel.vetter@ffwll.ch
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agonfsd: don't return an unhashed lock stateid after taking mutex
Jeff Layton [Thu, 11 Aug 2016 14:37:39 +0000 (10:37 -0400)]
nfsd: don't return an unhashed lock stateid after taking mutex

commit dd257933fa4b9fea66a1195f8a15111029810abc upstream.

nfsd4_lock will take the st_mutex before working with the stateid it
gets, but between the time when we drop the cl_lock and take the mutex,
the stateid could become unhashed (a'la FREE_STATEID). If that happens
the lock stateid returned to the client will be forgotten.

Fix this by first moving the st_mutex acquisition into
lookup_or_create_lock_state. Then, have it check to see if the lock
stateid is still hashed after taking the mutex. If it's not, then put
the stateid and try the find/create again.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Tested-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agonfsd: Fix race between FREE_STATEID and LOCK
Chuck Lever [Thu, 11 Aug 2016 14:37:30 +0000 (10:37 -0400)]
nfsd: Fix race between FREE_STATEID and LOCK

commit 42691398be08bd1fe99326911a0aa31f2c041d53 upstream.

When running LTP's nfslock01 test, the Linux client can send a LOCK
and a FREE_STATEID request at the same time. The outcome is:

Frame 324    R OPEN stateid [2,O]

Frame 115004 C LOCK lockowner_is_new stateid [2,O] offset 672000 len 64
Frame 115008 R LOCK stateid [1,L]
Frame 115012 C WRITE stateid [0,L] offset 672000 len 64
Frame 115016 R WRITE NFS4_OK
Frame 115019 C LOCKU stateid [1,L] offset 672000 len 64
Frame 115022 R LOCKU NFS4_OK
Frame 115025 C FREE_STATEID stateid [2,L]
Frame 115026 C LOCK lockowner_is_new stateid [2,O] offset 672128 len 64
Frame 115029 R FREE_STATEID NFS4_OK
Frame 115030 R LOCK stateid [3,L]
Frame 115034 C WRITE stateid [0,L] offset 672128 len 64
Frame 115038 R WRITE NFS4ERR_BAD_STATEID

In other words, the server returns stateid L in a successful LOCK
reply, but it has already released it. Subsequent uses of stateid L
fail.

To address this, protect the generation check in nfsd4_free_stateid
with the st_mutex. This should guarantee that only one of two
outcomes occurs: either LOCK returns a fresh valid stateid, or
FREE_STATEID returns NFS4ERR_LOCKS_HELD.

Reported-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Fix-suggested-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agonfs: don't create zero-length requests
Benjamin Coddington [Mon, 18 Jul 2016 14:41:57 +0000 (10:41 -0400)]
nfs: don't create zero-length requests

commit 149a4fddd0a72d526abbeac0c8deaab03559836a upstream.

NFS doesn't expect requests with wb_bytes set to zero and may make
unexpected decisions about how to handle that request at the page IO layer.
Skip request creation if we won't have any wb_bytes in the request.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoMIPS: KVM: Propagate kseg0/mapped tlb fault errors
James Hogan [Thu, 18 Aug 2016 09:05:32 +0000 (10:05 +0100)]
MIPS: KVM: Propagate kseg0/mapped tlb fault errors

commit 9b731bcfdec4c159ad2e4312e25d69221709b96a upstream.

Propagate errors from kvm_mips_handle_kseg0_tlb_fault() and
kvm_mips_handle_mapped_seg_tlb_fault(), usually triggering an internal
error since they normally indicate the guest accessed bad physical
memory or the commpage in an unexpected way.

Fixes: 858dd5d45733 ("KVM/MIPS32: MMU/TLB operations for the Guest.")
Fixes: e685c689f3a8 ("KVM/MIPS32: Privileged instruction/target branch emulation.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
[james.hogan@imgtec.com: Backport to v3.17.y - v4.4.y]
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoMIPS: KVM: Fix gfn range check in kseg0 tlb faults
James Hogan [Thu, 18 Aug 2016 09:05:31 +0000 (10:05 +0100)]
MIPS: KVM: Fix gfn range check in kseg0 tlb faults

commit 0741f52d1b980dbeb290afe67d88fc2928edd8ab upstream.

Two consecutive gfns are loaded into host TLB, so ensure the range check
isn't off by one if guest_pmap_npages is odd.

Fixes: 858dd5d45733 ("KVM/MIPS32: MMU/TLB operations for the Guest.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
[james.hogan@imgtec.com: Backport to v3.17.y - v4.4.y]
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoMIPS: KVM: Add missing gfn range check
James Hogan [Thu, 18 Aug 2016 09:05:30 +0000 (10:05 +0100)]
MIPS: KVM: Add missing gfn range check

commit 8985d50382359e5bf118fdbefc859d0dbf6cebc7 upstream.

kvm_mips_handle_mapped_seg_tlb_fault() calculates the guest frame number
based on the guest TLB EntryLo values, however it is not range checked
to ensure it lies within the guest_pmap. If the physical memory the
guest refers to is out of range then dump the guest TLB and emit an
internal error.

Fixes: 858dd5d45733 ("KVM/MIPS32: MMU/TLB operations for the Guest.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
[james.hogan@imgtec.com: Backport to v3.17.y - v4.4.y]
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoMIPS: KVM: Fix mapped fault broken commpage handling
James Hogan [Thu, 18 Aug 2016 09:05:29 +0000 (10:05 +0100)]
MIPS: KVM: Fix mapped fault broken commpage handling

commit c604cffa93478f8888bec62b23d6073dad03d43a upstream.

kvm_mips_handle_mapped_seg_tlb_fault() appears to map the guest page at
virtual address 0 to PFN 0 if the guest has created its own mapping
there. The intention is unclear, but it may have been an attempt to
protect the zero page from being mapped to anything but the comm page in
code paths you wouldn't expect from genuine commpage accesses (guest
kernel mode cache instructions on that address, hitting trapping
instructions when executing from that address with a coincidental TLB
eviction during the KVM handling, and guest user mode accesses to that
address).

Fix this to check for mappings exactly at KVM_GUEST_COMMPAGE_ADDR (it
may not be at address 0 since commit 42aa12e74e91 ("MIPS: KVM: Move
commpage so 0x0 is unmapped")), and set the corresponding EntryLo to be
interpreted as 0 (invalid).

Fixes: 858dd5d45733 ("KVM/MIPS32: MMU/TLB operations for the Guest.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
[james.hogan@imgtec.com: Backport to v3.17.y - v4.4.y]
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agorandom: add interrupt callback to VMBus IRQ handler
Stephan Mueller [Mon, 2 May 2016 06:14:34 +0000 (02:14 -0400)]
random: add interrupt callback to VMBus IRQ handler

commit 4b44f2d18a330565227a7348844493c59366171e upstream.

The Hyper-V Linux Integration Services use the VMBus implementation for
communication with the Hypervisor. VMBus registers its own interrupt
handler that completely bypasses the common Linux interrupt handling.
This implies that the interrupt entropy collector is not triggered.

This patch adds the interrupt entropy collection callback into the VMBus
interrupt handler function.

Signed-off-by: Stephan Mueller <stephan.mueller@atsec.com>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agorandom: print a warning for the first ten uninitialized random users
Theodore Ts'o [Mon, 13 Jun 2016 14:10:51 +0000 (10:10 -0400)]
random: print a warning for the first ten uninitialized random users

commit 9b4d008787f864f17d008c9c15bbe8a0f7e2fc24 upstream.

Since systemd is consistently using /dev/urandom before it is
initialized, we can't see the other potentially dangerous users of
/dev/urandom immediately after boot.  So print the first ten such
complaints instead.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agorandom: initialize the non-blocking pool via add_hwgenerator_randomness()
Theodore Ts'o [Sun, 12 Jun 2016 22:11:51 +0000 (18:11 -0400)]
random: initialize the non-blocking pool via add_hwgenerator_randomness()

commit 3371f3da08cff4b75c1f2dce742d460539d6566d upstream.

If we have a hardware RNG and are using the in-kernel rngd, we should
use this to initialize the non-blocking pool so that getrandom(2)
doesn't block unnecessarily.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoCIFS: Fix a possible invalid memory access in smb2_query_symlink()
Pavel Shilovsky [Sun, 24 Jul 2016 07:37:38 +0000 (10:37 +0300)]
CIFS: Fix a possible invalid memory access in smb2_query_symlink()

commit 7893242e2465aea6f2cbc2639da8fa5ce96e8cc2 upstream.

During following a symbolic link we received err_buf from SMB2_open().
While the validity of SMB2 error response is checked previously
in smb2_check_message() a symbolic link payload is not checked at all.
Fix it by adding such checks.

Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agocifs: fix crash due to race in hmac(md5) handling
Rabin Vincent [Tue, 19 Jul 2016 07:26:21 +0000 (09:26 +0200)]
cifs: fix crash due to race in hmac(md5) handling

commit bd975d1eead2558b76e1079e861eacf1f678b73b upstream.

The secmech hmac(md5) structures are present in the TCP_Server_Info
struct and can be shared among multiple CIFS sessions.  However, the
server mutex is not currently held when these structures are allocated
and used, which can lead to a kernel crashes, as in the scenario below:

mount.cifs(8) #1 mount.cifs(8) #2

Is secmech.sdeschmaccmd5 allocated?
// false

Is secmech.sdeschmaccmd5 allocated?
// false

secmech.hmacmd = crypto_alloc_shash..
secmech.sdeschmaccmd5 = kzalloc..
sdeschmaccmd5->shash.tfm = &secmec.hmacmd;

secmech.sdeschmaccmd5 = kzalloc
// sdeschmaccmd5->shash.tfm
// not yet assigned

crypto_shash_update()
 deref NULL sdeschmaccmd5->shash.tfm

 Unable to handle kernel paging request at virtual address 00000030
 epc   : 8027ba34 crypto_shash_update+0x38/0x158
 ra    : 8020f2e8 setup_ntlmv2_rsp+0x4bc/0xa84
 Call Trace:
  crypto_shash_update+0x38/0x158
  setup_ntlmv2_rsp+0x4bc/0xa84
  build_ntlmssp_auth_blob+0xbc/0x34c
  sess_auth_rawntlmssp_authenticate+0xac/0x248
  CIFS_SessSetup+0xf0/0x178
  cifs_setup_session+0x4c/0x84
  cifs_get_smb_ses+0x2c8/0x314
  cifs_mount+0x38c/0x76c
  cifs_do_mount+0x98/0x440
  mount_fs+0x20/0xc0
  vfs_kern_mount+0x58/0x138
  do_mount+0x1e8/0xccc
  SyS_mount+0x88/0xd4
  syscall_common+0x30/0x54

Fix this by locking the srv_mutex around the code which uses these
hmac(md5) structures.  All the other secmech algos already have similar
locking.

Fixes: 95dc8dd14e2e84cc ("Limit allocation of crypto mechanisms to dialect which requires")
Signed-off-by: Rabin Vincent <rabinv@axis.com>
Acked-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agocifs: Check for existing directory when opening file with O_CREAT
Sachin Prabhu [Thu, 7 Jul 2016 20:28:27 +0000 (21:28 +0100)]
cifs: Check for existing directory when opening file with O_CREAT

commit 8d9535b6efd86e6c07da59f97e68f44efb7fe080 upstream.

When opening a file with O_CREAT flag, check to see if the file opened
is an existing directory.

This prevents the directory from being opened which subsequently causes
a crash when the close function for directories cifs_closedir() is called
which frees up the file->private_data memory while the file is still
listed on the open file list for the tcon.

Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reported-by: Xiaoli Feng <xifeng@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agofs/cifs: make share unaccessible at root level mountable
Aurelien Aptel [Wed, 25 May 2016 17:59:09 +0000 (19:59 +0200)]
fs/cifs: make share unaccessible at root level mountable

commit a6b5058fafdf508904bbf16c29b24042cef3c496 upstream.

if, when mounting //HOST/share/sub/dir/foo we can query /sub/dir/foo but
not any of the path components above:

- store the /sub/dir/foo prefix in the cifs super_block info
- in the superblock, set root dentry to the subpath dentry (instead of
  the share root)
- set a flag in the superblock to remember it
- use prefixpath when building path from a dentry

fixes bso#8950

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agojbd2: make journal y2038 safe
Arnd Bergmann [Thu, 30 Jun 2016 15:49:01 +0000 (11:49 -0400)]
jbd2: make journal y2038 safe

commit abcfb5d979892fc8b12574551fc907c05fe1b11b upstream.

The jbd2 journal stores the commit time in 64-bit seconds and 32-bit
nanoseconds, which avoids an overflow in 2038, but it gets the numbers
from current_kernel_time(), which uses 'long' seconds on 32-bit
architectures.

This simply changes the code to call current_kernel_time64() so
we use 64-bit seconds consistently.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoARC: mm: don't loose PTE_SPECIAL in pte_modify()
Vineet Gupta [Thu, 28 Jul 2016 18:35:50 +0000 (11:35 -0700)]
ARC: mm: don't loose PTE_SPECIAL in pte_modify()

commit 3925a16ae980c79d1a8fd182d7f9487da1edd4dc upstream.

LTP madvise05 was generating mm splat

| [ARCLinux]# /sd/ltp/testcases/bin/madvise05
| BUG: Bad page map in process madvise05  pte:80e08211 pmd:9f7d4000
| page:9fdcfc90 count:1 mapcount:-1 mapping:  (null) index:0x0 flags: 0x404(referenced|reserved)
| page dumped because: bad pte
| addr:200b8000 vm_flags:00000070 anon_vma:  (null) mapping:  (null) index:1005c
| file:  (null) fault:  (null) mmap:  (null) readpage:  (null)
| CPU: 2 PID: 6707 Comm: madvise05

And for newer kernels, the system was rendered unusable afterwards.

The problem was mprotect->pte_modify() clearing PTE_SPECIAL (which is
set to identify the special zero page wired to the pte).
When pte was finally unmapped, special casing for zero page was not
done, and instead it was treated as a "normal" page, tripping on the
map counts etc.

This fixes ARC STAR 9001053308

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoremoteproc: Fix potential race condition in rproc_add
Dave Gerlach [Wed, 25 May 2016 20:41:28 +0000 (15:41 -0500)]
remoteproc: Fix potential race condition in rproc_add

commit d2e12e66a939c54ed84e5f1b6947f0c45f6c56eb upstream.

rproc_add adds the newly created remoteproc to a list for use by
rproc_get_by_phandle and then does some additional processing to finish
adding the remoteproc. This leaves a small window of time in which the
rproc is available in the list but not yet fully initialized, so if
another driver comes along and gets a handle to the rproc, it will be
invalid. Rearrange the code in rproc_add to make sure the rproc is added
to the list only after it has been successfuly initialized.

Fixes: fec47d863587 ("remoteproc: introduce rproc_get_by_phandle API")
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoovl: disallow overlayfs as upperdir
Miklos Szeredi [Fri, 29 Jul 2016 10:05:24 +0000 (12:05 +0200)]
ovl: disallow overlayfs as upperdir

commit 76bc8e2843b66f8205026365966b49ec6da39ae7 upstream.

This does not work and does not make sense.  So instead of fixing it
(probably not hard) just disallow.

Reported-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoHID: uhid: fix timeout when probe races with IO
Roderick Colenbrander [Wed, 18 May 2016 20:11:09 +0000 (13:11 -0700)]
HID: uhid: fix timeout when probe races with IO

commit 67f8ecc550b5bda03335f845dc869b8501d25fd0 upstream.

Many devices use userspace bluetooth stacks like BlueZ or Bluedroid in combination
with uhid. If any of these stacks is used with a HID device for which the driver
performs a HID request as part .probe (or technically another HID operation),
this results in a deadlock situation. The deadlock results in a 5 second timeout
for I/O operations in HID drivers, so isn't fatal, but none of the I/O operations
have a chance of succeeding.

The root cause for the problem is that uhid only allows for one request to be
processed at a time per uhid instance and locks out other operations. This means
that if a user space is creating a new HID device through 'UHID_CREATE', which
ultimately triggers '.probe' through the HID layer. Then any HID request e.g. a
read for calibration data would trigger a HID operation on uhid again, but it
won't go out to userspace, because it is still stuck in UHID_CREATE.
In addition bluetooth stacks are typically single threaded, so they wouldn't be
able to handle any requests while waiting on uhid.

Lucikly the UHID spec is somewhat flexible and allows for fixing the issue,
without breaking user space. The idea which the patch implements as discussed
with David Herrmann is to decouple adding of a hid device (which triggers .probe)
from UHID_CREATE. The work will kick off roughly once UHID_CREATE completed (or
else will wait a tiny bit of time in .probe for a lock). A HID driver has to call
HID to call 'hid_hw_start()' as part of .probe once it is ready for I/O, which
triggers UHID_START to user space. Any HID operations should function now within
.probe and won't deadlock because userspace is stuck on UHID_CREATE.

We verified this patch on Bluedroid with Android 6.0 and on desktop Linux with
BlueZ stacks. Prior to the patch they had the deadlock issue.

[jkosina@suse.cz: reword subject]
Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoEDAC: Correct channel count limit
Borislav Petkov [Fri, 10 Jun 2016 08:28:38 +0000 (10:28 +0200)]
EDAC: Correct channel count limit

commit bba142957e04c400440d2df83c1b3b2dfc42e220 upstream.

c44696fff04f ("EDAC: Remove arbitrary limit on number of channels")
lifted the arbitrary limit on memory controller channels in EDAC.
However, the dynamic channel attributes dynamic_csrow_dimm_attr and
dynamic_csrow_ce_count_attr remained 6.

This wasn't a problem except channels 6 and 7 weren't visible in sysfs
on machines with more than 6 channels after the conversion to static
attr groups with

  2c1946b6d629 ("EDAC: Use static attribute groups for managing sysfs entries")

 [ without that, we're exploding in edac_create_sysfs_mci_device()
   because we're dereferencing out of the bounds of the
   dynamic_csrow_dimm_attr array. ]

Add attributes for channels 6 and 7 along with a guard for the
future, should more channels be required and/or to sanity check for
misconfigured machines.

We still need to check against the number of channels present on the MC
first, as Thor reported.

Signed-off-by: Borislav Petkov <bp@suse.de>
Reported-by: Hironobu Ishii <ishii.hironobu@jp.fujitsu.com>
Tested-by: Thor Thayer <tthayer@opensource.altera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoBluetooth: Fix l2cap_sock_setsockopt() with optname BT_RCVMTU
Amadeusz Sławiński [Thu, 14 Jul 2016 08:50:23 +0000 (10:50 +0200)]
Bluetooth: Fix l2cap_sock_setsockopt() with optname BT_RCVMTU

commit 23bc6ab0a0912146fd674a0becc758c3162baabc upstream.

When we retrieve imtu value from userspace we should use 16 bit pointer
cast instead of 32 as it's defined that way in headers. Fixes setsockopt
calls on big-endian platforms.

Signed-off-by: Amadeusz Sławiński <amadeusz.slawinski@tieto.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agospi: pxa2xx: Clear all RFT bits in reset_sccr1() on Intel Quark
Andy Shevchenko [Wed, 6 Jul 2016 09:08:11 +0000 (12:08 +0300)]
spi: pxa2xx: Clear all RFT bits in reset_sccr1() on Intel Quark

commit 152bc19e2fc2b7fce7ffbc2a9cea94b147223702 upstream.

It seems the commit e5262d0568dc ("spi: spi-pxa2xx: SPI support for Intel Quark
X1000") misses one place to be adapted for Intel Quark, i.e. in reset_sccr1().

Clear all RFT bits when call reset_sccr1() on Intel Quark.

Fixes: e5262d0568dc ("spi: spi-pxa2xx: SPI support for Intel Quark X1000")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoi2c: efm32: fix a failure path in efm32_i2c_probe()
Alexey Khoroshilov [Fri, 15 Jul 2016 23:36:38 +0000 (02:36 +0300)]
i2c: efm32: fix a failure path in efm32_i2c_probe()

commit 7dd91d52a813f99a95d20f539b777e9e6198b931 upstream.

There is the only failure path in efm32_i2c_probe(),
where clk_disable_unprepare() is missed.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Fixes: 1b5b23718b84 ("i2c: efm32: new bus driver")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agos5p-mfc: Add release callback for memory region devs
Javier Martinez Canillas [Tue, 3 May 2016 20:27:17 +0000 (16:27 -0400)]
s5p-mfc: Add release callback for memory region devs

commit 6311f1261f59ce5e51fbe5cc3b5e7737197316ac upstream.

When s5p_mfc_remove() calls put_device() for the reserved memory region
devs, the driver core warns that the dev doesn't have a release callback:

WARNING: CPU: 0 PID: 591 at drivers/base/core.c:251 device_release+0x8c/0x90
Device 's5p-mfc-l' does not have a release() function, it is broken and must be fixed.

Also, the declared DMA memory using dma_declare_coherent_memory() isn't
relased so add a dev .release that calls dma_release_declared_memory().

Fixes: 6e83e6e25eb4 ("[media] s5p-mfc: Fix kernel warning on memory init")
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agos5p-mfc: Set device name for reserved memory region devs
Javier Martinez Canillas [Tue, 3 May 2016 20:27:16 +0000 (16:27 -0400)]
s5p-mfc: Set device name for reserved memory region devs

commit 29debab0a94035a390801d1f177d171d014b7765 upstream.

The devices don't have a name set, so makes dev_name() returns NULL which
makes harder to identify the devices that are causing issues, for example:

WARNING: CPU: 2 PID: 616 at drivers/base/core.c:251 device_release+0x8c/0x90
Device '(null)' does not have a release() function, it is broken and must be fixed.

And after setting the device name:

WARNING: CPU: 0 PID: 591 at drivers/base/core.c:251 device_release+0x8c/0x90
Device 's5p-mfc-l' does not have a release() function, it is broken and must be fixed.

Fixes: 6e83e6e25eb4 ("[media] s5p-mfc: Fix kernel warning on memory init")
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agohp-wmi: Fix wifi cannot be hard-unblocked
Alex Hung [Mon, 13 Jun 2016 11:44:00 +0000 (19:44 +0800)]
hp-wmi: Fix wifi cannot be hard-unblocked

commit fc8a601e1175ae351f662506030f9939cb7fdbfe upstream.

Several users reported wifi cannot be unblocked as discussed in [1].
This patch removes the use of the 2009 flag by BIOS but uses the actual
WMI function calls - it will be skipped if WMI reports unsupported.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=69131

Signed-off-by: Alex Hung <alex.hung@canonical.com>
Tested-by: Evgenii Shatokhin <eugene.shatokhin@yandex.ru>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agodm: set DMF_SUSPENDED* _before_ clearing DMF_NOFLUSH_SUSPENDING
Mike Snitzer [Tue, 2 Aug 2016 17:07:20 +0000 (13:07 -0400)]
dm: set DMF_SUSPENDED* _before_ clearing DMF_NOFLUSH_SUSPENDING

commit eaf9a7361f47727b166688a9f2096854eef60fbe upstream.

Otherwise, there is potential for both DMF_SUSPENDED* and
DMF_NOFLUSH_SUSPENDING to not be set during dm_suspend() -- which is
definitely _not_ a valid state.

This fix, in conjuction with "dm rq: fix the starting and stopping of
blk-mq queues", addresses the potential for request-based DM multipath's
__multipath_map() to see !dm_noflush_suspending() during suspend.

Reported-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agosur40: fix occasional oopses on device close
Florian Echtler [Tue, 31 May 2016 20:15:33 +0000 (17:15 -0300)]
sur40: fix occasional oopses on device close

commit 6a8588156657e607fcfdffd46c1daae8ba88a1e5 upstream.

Closing the V4L2 device sometimes triggers a kernel oops.
Present patch fixes this.

Signed-off-by: Martin Kaltenbrunner <modin@yuri.at>
Signed-off-by: Florian Echtler <floe@butterbrot.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agosur40: lower poll interval to fix occasional FPS drops to ~56 FPS
Florian Echtler [Tue, 31 May 2016 20:15:32 +0000 (17:15 -0300)]
sur40: lower poll interval to fix occasional FPS drops to ~56 FPS

commit af766ee005c496b8567976dc3eed7676443ed6de upstream.

The framerate sometimes drops below 60 Hz if the poll interval is too high.
Lowering it to the minimum of 1 ms fixes this.

Signed-off-by: Martin Kaltenbrunner <modin@yuri.at>
Signed-off-by: Florian Echtler <floe@butterbrot.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoFix RC5 decoding with Fintek CIR chipset
Jonathan McDowell [Sat, 14 May 2016 17:01:26 +0000 (14:01 -0300)]
Fix RC5 decoding with Fintek CIR chipset

commit bbdb34c90aeb8b2253eae88029788ebe1d7f2fd4 upstream.

Fix RC5 decoding with Fintek CIR chipset

Commit e87b540be2dd02552fb9244d50ae8b4e4619a34b tightened up the RC5
decoding by adding a check for trailing silence to ensure a valid RC5
command had been received. Unfortunately the trailer length checked was
10 units and the Fintek CIR device does not want to provide details of a
space longer than 6350us. This meant that RC5 remotes working on a
Fintek setup on 3.16 failed on 3.17 and later. Fix this by shortening
the trailer check to 6 units (allowing for a previous space in the
received remote command).

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=117221

Signed-off-by: Jonathan McDowell <noodles@earth.li>
Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agovb2: core: Skip planes array verification if pb is NULL
Sakari Ailus [Wed, 11 May 2016 21:44:32 +0000 (18:44 -0300)]
vb2: core: Skip planes array verification if pb is NULL

commit 126f40298446a82116e1f92a1aaf72b8c8228fae upstream.

An earlier patch fixing an input validation issue introduced another
issue: vb2_core_dqbuf() is called with pb argument value NULL in some
cases, causing a NULL pointer dereference. Fix this by skipping the
verification as there's nothing to verify.

Fixes: e7e0c3e26587 ("[media] videobuf2-core: Check user space planes array in dqbuf")

Signed-off-by: David R <david@unsolicited.net>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agovideobuf2-v4l2: Verify planes array in buffer dequeueing
Sakari Ailus [Sun, 3 Apr 2016 19:31:03 +0000 (16:31 -0300)]
videobuf2-v4l2: Verify planes array in buffer dequeueing

commit 83934b75c368f529d084815c463a7ef781dc9751 upstream.

When a buffer is being dequeued using VIDIOC_DQBUF IOCTL, the exact buffer
which will be dequeued is not known until the buffer has been removed from
the queue. The number of planes is specific to a buffer, not to the queue.

This does lead to the situation where multi-plane buffers may be requested
and queued with n planes, but VIDIOC_DQBUF IOCTL may be passed an argument
struct with fewer planes.

__fill_v4l2_buffer() however uses the number of planes from the dequeued
videobuf2 buffer, overwriting kernel memory (the m.planes array allocated
in video_usercopy() in v4l2-ioctl.c)  if the user provided fewer
planes than the dequeued buffer had. Oops!

Fixes: b0e0e1f83de3 ("[media] media: videobuf2: Prepare to divide videobuf2")

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agomedia: dvb_ringbuffer: Add memory barriers
Soeren Moch [Wed, 11 May 2016 16:49:11 +0000 (13:49 -0300)]
media: dvb_ringbuffer: Add memory barriers

commit ca6e6126db5494f18c6c6615060d4d803b528bff upstream.

Implement memory barriers according to Documentation/circular-buffers.txt:
- use smp_store_release() to update ringbuffer read/write pointers
- use smp_load_acquire() to load write pointer on reader side
- use ACCESS_ONCE() to load read pointer on writer side

This fixes data stream corruptions observed e.g. on an ARM Cortex-A9
quad core system with different types (PCI, USB) of DVB tuners.

Signed-off-by: Soeren Moch <smoch@web.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agomedia: usbtv: prevent access to free'd resources
Matthew Leach [Fri, 8 Jul 2016 12:04:27 +0000 (09:04 -0300)]
media: usbtv: prevent access to free'd resources

commit 2a00932f082aff93c3a55426e0c7af6d0ec03997 upstream.

When disconnecting the usbtv device, the sound card is unregistered
from ALSA and the snd member of the usbtv struct is set to NULL.  If
the usbtv snd_trigger work is running, this can cause a race condition
where the kernel will attempt to access free'd resources, shown in
[1].

This patch fixes the disconnection code by cancelling any snd_trigger
work before unregistering the sound card from ALSA and checking that
the snd member still exists in the work function.

[1]:
 usb 3-1.2: USB disconnect, device number 6
 BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
 IP: [<ffffffff81093850>] process_one_work+0x30/0x480
 PGD 405bbf067 PUD 405bbe067 PMD 0
 Call Trace:
  [<ffffffff81093ce8>] worker_thread+0x48/0x4e0
  [<ffffffff81093ca0>] ? process_one_work+0x480/0x480
  [<ffffffff81093ca0>] ? process_one_work+0x480/0x480
  [<ffffffff81099998>] kthread+0xd8/0xf0
  [<ffffffff815c73c2>] ret_from_fork+0x22/0x40
  [<ffffffff810998c0>] ? kthread_worker_fn+0x170/0x170
 ---[ end trace 0f3dac5c1a38e610 ]---

Signed-off-by: Matthew Leach <matthew@mattleach.net>
Tested-by: Peter Sutton <foxxy@foxdogstudios.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agomfd: qcom_rpm: Parametrize also ack selector size
Linus Walleij [Wed, 22 Jun 2016 06:27:17 +0000 (08:27 +0200)]
mfd: qcom_rpm: Parametrize also ack selector size

commit f37be01e6dc606f2fcc5e95c9933d948ce19bd35 upstream.

The RPM has two sets of selectors (IPC bit fields): request and
acknowledge. Apparently, some models use 4*32 bit words for select
and some use 7*32 bit words for request, but all use 7*32 words
for acknowledge bits.

So apparently you can on the models with requests of 4*32 select
bits send 4*32 messages and get 7*32 different replies, so on ACK
interrupt, 7*32 bit words need to be read. This is how the vendor
code apparently works.

Reported-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agomfd: qcom_rpm: Fix offset error for msm8660
Linus Walleij [Tue, 14 Jun 2016 23:02:26 +0000 (01:02 +0200)]
mfd: qcom_rpm: Fix offset error for msm8660

commit 9835f1b70bb3890d38308b9be4fb9d7451ba67f1 upstream.

The RPM in MSM8660/APQ8060 has different offsets to the selector
ACK and request context ACK registers. Make all these register
offsets part of the per-SoC data and assign the right values.

The bug was found by verifying backwards to the vendor tree in
the out-of-tree files <mach/rpm-[8660|8064|8960]>: all were using
offsets 3,11,15,23 and a select size of 4, except the MSM8660/APQ8060
which was using offsets 3,11,19,27 and a select size of 7.

All other platforms apart from msm8660 were affected by reading
excess registers, since 7 was hardcoded as the number of select
words, this patch makes also this part dynamic so we only write/read
as many select words as the platform actually use.

Symptoms of this bug when using msm8660: the first RPM transaction
would work, but the next would stall or raise an error since the
previous transaction was not properly ACKed as the ACK words were
read at the wrong offset.

Fixes: 58e214382bdd ("mfd: qcom-rpm: Driver for the Qualcomm RPM")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Björn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agointel_pstate: Fix MSR_CONFIG_TDP_x addressing in core_get_max_pstate()
Jan Kiszka [Fri, 8 Jul 2016 18:42:04 +0000 (20:42 +0200)]
intel_pstate: Fix MSR_CONFIG_TDP_x addressing in core_get_max_pstate()

commit 5fc8f707a2aa40c767c3a338738b9b6fcd151ac1 upstream.

If MSR_CONFIG_TDP_CONTROL is locked, we currently try to address some
MSR 0x80000648 or so. Mask out the relevant level bits 0 and 1.

Found while running over the Jailhouse hypervisor which became upset
about this strange MSR index.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agos390/cio: allow to reset channel measurement block
Sebastian Ott [Tue, 12 Jul 2016 17:57:57 +0000 (19:57 +0200)]
s390/cio: allow to reset channel measurement block

commit 0f5d050ceaa31b2229102211d60c149f920df3aa upstream.

Prior to commit 1bc6664bdfb949bc69a08113801e7d6acbf6bc3f a call to
enable_cmf for a device for which channel measurement was already
enabled resulted in a reset of the measurement data.

What looked like bugs at the time (a 2nd allocation was triggered
but failed, reset was called regardless of previous failures, and
errors have not been reported to userspace) was actually something
at least one userspace tool depended on. Restore that behavior in
a sane way.

Fixes: 1bc6664bdfb ("s390/cio: use device_lock during cmb activation")
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoKVM: nVMX: Fix memory corruption when using VMCS shadowing
Jim Mattson [Fri, 8 Jul 2016 22:36:06 +0000 (15:36 -0700)]
KVM: nVMX: Fix memory corruption when using VMCS shadowing

commit 2f1fe81123f59271bddda673b60116bde9660385 upstream.

When freeing the nested resources of a vcpu, there is an assumption that
the vcpu's vmcs01 is the current VMCS on the CPU that executes
nested_release_vmcs12(). If this assumption is violated, the vcpu's
vmcs01 may be made active on multiple CPUs at the same time, in
violation of Intel's specification. Moreover, since the vcpu's vmcs01 is
not VMCLEARed on every CPU on which it is active, it can linger in a
CPU's VMCS cache after it has been freed and potentially
repurposed. Subsequent eviction from the CPU's VMCS cache on a capacity
miss can result in memory corruption.

It is not sufficient for vmx_free_vcpu() to call vmx_load_vmcs01(). If
the vcpu in question was last loaded on a different CPU, it must be
migrated to the current CPU before calling vmx_load_vmcs01().

Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoKVM: VMX: handle PML full VMEXIT that occurs during event delivery
Cao, Lei [Fri, 15 Jul 2016 13:54:04 +0000 (13:54 +0000)]
KVM: VMX: handle PML full VMEXIT that occurs during event delivery

commit b244c9fc251e14a083a1cbf04bef10bd99303a76 upstream.

With PML enabled, guest will shut down if a PML full VMEXIT occurs during
event delivery. According to Intel SDM 27.2.3, PML full VMEXIT can occur when
event is being delivered through IDT, so KVM should not exit to user space
with error. Instead, it should let EXIT_REASON_PML_FULL go through and the
event will be re-injected on the next VMENTRY.

Signed-off-by: Lei Cao <lei.cao@stratus.com>
Fixes: 843e4330573c ("KVM: VMX: Add PML support in VMX")
[Shortened the summary and Cc'd stable.]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoKVM: MTRR: fix kvm_mtrr_check_gfn_range_consistency page fault
Alexis Dambricourt [Mon, 4 Jul 2016 19:05:15 +0000 (21:05 +0200)]
KVM: MTRR: fix kvm_mtrr_check_gfn_range_consistency page fault

commit 30b072ce0356e8b141f4ca6da7220486fa3641d9 upstream.

The following #PF may occurs:
[ 1403.317041] BUG: unable to handle kernel paging request at 0000000200000068
[ 1403.317045] IP: [<ffffffffc04c20b0>] __mtrr_lookup_var_next+0x10/0xa0 [kvm]

[ 1403.317123] Call Trace:
[ 1403.317134]  [<ffffffffc04c2a65>] ? kvm_mtrr_check_gfn_range_consistency+0xc5/0x120 [kvm]
[ 1403.317143]  [<ffffffffc04ac11f>] ? tdp_page_fault+0x9f/0x2c0 [kvm]
[ 1403.317152]  [<ffffffffc0498128>] ? kvm_set_msr_common+0x858/0xc00 [kvm]
[ 1403.317161]  [<ffffffffc04b8883>] ? x86_emulate_insn+0x273/0xd30 [kvm]
[ 1403.317171]  [<ffffffffc04c04e4>] ? kvm_cpuid+0x34/0x190 [kvm]
[ 1403.317180]  [<ffffffffc04a5bb9>] ? kvm_mmu_page_fault+0x59/0xe0 [kvm]
[ 1403.317183]  [<ffffffffc0d729e1>] ? vmx_handle_exit+0x1d1/0x14a0 [kvm_intel]
[ 1403.317185]  [<ffffffffc0d75f3f>] ? atomic_switch_perf_msrs+0x6f/0xa0 [kvm_intel]
[ 1403.317187]  [<ffffffffc0d7621d>] ? vmx_vcpu_run+0x2ad/0x420 [kvm_intel]
[ 1403.317196]  [<ffffffffc04a0962>] ? kvm_arch_vcpu_ioctl_run+0x622/0x1550 [kvm]
[ 1403.317204]  [<ffffffffc049abb9>] ? kvm_arch_vcpu_load+0x59/0x210 [kvm]
[ 1403.317206]  [<ffffffff81036245>] ? __kernel_fpu_end+0x35/0x100
[ 1403.317213]  [<ffffffffc0487eb6>] ? kvm_vcpu_ioctl+0x316/0x5d0 [kvm]
[ 1403.317215]  [<ffffffff81088225>] ? do_sigtimedwait+0xd5/0x220
[ 1403.317217]  [<ffffffff811f84dd>] ? do_vfs_ioctl+0x9d/0x5c0
[ 1403.317224]  [<ffffffffc04928ae>] ? kvm_on_user_return+0x3e/0x70 [kvm]
[ 1403.317225]  [<ffffffff811f8a74>] ? SyS_ioctl+0x74/0x80
[ 1403.317227]  [<ffffffff815bf0b6>] ? entry_SYSCALL_64_fastpath+0x1e/0xa8
[ 1403.317242] RIP  [<ffffffffc04c20b0>] __mtrr_lookup_var_next+0x10/0xa0 [kvm]

At mtrr_lookup_fixed_next(), when the condition
'if (iter->index >= ARRAY_SIZE(iter->mtrr_state->fixed_ranges))' becomes true,
mtrr_lookup_var_start() is called with iter->range with gargabe values from the
fixed MTRR union field. Then, list_prepare_entry() do not call list_entry()
initialization, keeping a garbage pointer in iter->range which is accessed in
the following __mtrr_lookup_var_next() call.

Fixes: f571c0973e4b8c888e049b6842e4b4f93b5c609c
Signed-off-by: Alexis Dambricourt <alexis@blade-group.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoKVM: PPC: Book3S HV: Save/restore TM state in H_CEDE
Paul Mackerras [Wed, 22 Jun 2016 05:52:55 +0000 (15:52 +1000)]
KVM: PPC: Book3S HV: Save/restore TM state in H_CEDE

commit 93d17397e4e2182fdaad503e2f9da46202c0f1c3 upstream.

It turns out that if the guest does a H_CEDE while the CPU is in
a transactional state, and the H_CEDE does a nap, and the nap
loses the architected state of the CPU (which is is allowed to do),
then we lose the checkpointed state of the virtual CPU.  In addition,
the transactional-memory state recorded in the MSR gets reset back
to non-transactional, and when we try to return to the guest, we take
a TM bad thing type of program interrupt because we are trying to
transition from non-transactional to transactional with a hrfid
instruction, which is not permitted.

The result of the program interrupt occurring at that point is that
the host CPU will hang in an infinite loop with interrupts disabled.
Thus this is a denial of service vulnerability in the host which can
be triggered by any guest (and depending on the guest kernel, it can
potentially triggered by unprivileged userspace in the guest).

This vulnerability has been assigned the ID CVE-2016-5412.

To fix this, we save the TM state before napping and restore it
on exit from the nap, when handling a H_CEDE in real mode.  The
case where H_CEDE exits to host virtual mode is already OK (as are
other hcalls which exit to host virtual mode) because the exit
path saves the TM state.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoKVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures
Paul Mackerras [Wed, 22 Jun 2016 04:21:59 +0000 (14:21 +1000)]
KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures

commit f024ee098476a3e620232e4a78cfac505f121245 upstream.

This moves the transactional memory state save and restore sequences
out of the guest entry/exit paths into separate procedures.  This is
so that these sequences can be used in going into and out of nap
in a subsequent patch.

The only code changes here are (a) saving and restore LR on the
stack, since these new procedures get called with a bl instruction,
(b) explicitly saving r1 into the PACA instead of assuming that
HSTATE_HOST_R1(r13) is already set, and (c) removing an unnecessary
and redundant setting of MSR[TM] that should have been removed by
commit 9d4d0bdd9e0a ("KVM: PPC: Book3S HV: Add transactional memory
support", 2013-09-24) but wasn't.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoarm64: mm: avoid fdt_check_header() before the FDT is fully mapped
Ard Biesheuvel [Mon, 1 Aug 2016 11:29:31 +0000 (13:29 +0200)]
arm64: mm: avoid fdt_check_header() before the FDT is fully mapped

commit 04a848106193b134741672f7e4e444b50c70b631 upstream.

As reported by Zijun, the fdt_check_header() call in __fixmap_remap_fdt()
is not safe since it is not guaranteed that the FDT header is mapped
completely. Due to the minimum alignment of 8 bytes, the only fields we
can assume to be mapped are 'magic' and 'totalsize'.

Since the OF layer is in charge of validating the FDT image, and we are
only interested in making reasonably sure that the size field contains
a meaningful value, replace the fdt_check_header() call with an explicit
comparison of the magic field's value against the expected value.

Reported-by: Zijun Hu <zijun_hu@htc.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoarm64: dts: rockchip: fixes the gic400 2nd region size for rk3368
Caesar Wang [Wed, 18 May 2016 14:41:50 +0000 (22:41 +0800)]
arm64: dts: rockchip: fixes the gic400 2nd region size for rk3368

commit ad1cfdf518976447e6b0d31517bad4e3ebbce6bb upstream.

The 2nd additional region is the GIC virtual cpu interface register
base and size.

As the gic400 of rk3368 says, the cpu interface register map as below

:

-0x0000 GICC_CTRL
.
.
.
-0x00fc GICC_IIDR
-0x1000 GICC_IDR

Obviously, the region size should be greater than 0x1000.
So we should make sure to include the GICC_IDR since the kernel will access
it in some cases.

Fixes: b790c2cab5ca ("arm64: dts: add Rockchip rk3368 core dtsi and board dts for the r88 board")
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[added Fixes and stable-cc]
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
8 years agopinctrl: cherryview: prevent concurrent access to GPIO controllers
Dan O'Donovan [Fri, 10 Jun 2016 12:23:34 +0000 (13:23 +0100)]
pinctrl: cherryview: prevent concurrent access to GPIO controllers

commit 0bd50d719b004110e791800450ad204399100a86 upstream.

Due to a silicon issue on the Atom X5-Z8000 "Cherry Trail" processor
series, a common lock must be used to prevent concurrent accesses
across the 4 GPIO controllers managed by this driver.

See Intel Atom Z8000 Processor Series Specification Update
(Rev. 005), errata #CHT34, for further information.

Signed-off-by: Dan O'Donovan <dan@emutex.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoBluetooth: hci_intel: Fix null gpio desc pointer dereference
Loic Poulain [Thu, 28 Apr 2016 16:48:25 +0000 (18:48 +0200)]
Bluetooth: hci_intel: Fix null gpio desc pointer dereference

commit 32b9ccbc3522811c0e483637b85ae25f5491296f upstream.

gpiod_get_optional can return either ERR_PTR or NULL pointer.
NULL case is not tested and then dereferenced later in desc_to_gpio.
Fix this by using non optional version which returns ERR_PTR in any
error case (this is not an optional gpio).
Use the same non optional version for the host-wake gpio.

Fixes: 765ea3abd116 ("Bluetooth: hci_intel: Retrieve host-wake IRQ")
Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agogpio: intel-mid: Remove potentially harmful code
Andy Shevchenko [Wed, 6 Jul 2016 09:50:12 +0000 (12:50 +0300)]
gpio: intel-mid: Remove potentially harmful code

commit 3dbd3212f81b2b410a34a922055e2da792864829 upstream.

The commit d56d6b3d7d69 ("gpio: langwell: add Intel Merrifield support")
doesn't look at all as a proper support for Intel Merrifield and I dare to say
that it distorts the behaviour of the hardware.

The register map is different on Intel Merrifield, i.e. only 6 out of 8
register have the same purpose but none of them has same location in the
address space. The current case potentially harmful to existing hardware since
it's poking registers on wrong offsets and may set some pin to be GPIO output
when connected hardware doesn't expect such.

Besides the above GPIO and pinctrl on Intel Merrifield have been located in
different IP blocks. The functionality has been extended as well, i.e. added
support of level interrupts, special registers for wake capable sources and
thus, in my opinion, requires a completele separate driver.

If someone wondering the existing gpio-intel-mid.c would be converted to actual
pinctrl (which by the fact it is now), though I wouldn't be a volunteer to do
that.

Fixes: d56d6b3d7d69 ("gpio: langwell: add Intel Merrifield support")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agogpio: pca953x: Fix NBANK calculation for PCA9536
Vignesh R [Thu, 9 Jun 2016 05:32:04 +0000 (11:02 +0530)]
gpio: pca953x: Fix NBANK calculation for PCA9536

commit a246b8198f776a16d1d3a3bbfc2d437bad766b29 upstream.

NBANK() macro assumes that ngpios is a multiple of 8(BANK_SZ) and
hence results in 0 banks for PCA9536 which has just 4 gpios. This is
wrong as PCA9356 has 1 bank with 4 gpios. This results in uninitialized
PCA953X_INVERT register. Fix this by using DIV_ROUND_UP macro in
NBANK().

Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agotty/serial: atmel: fix RS485 half duplex with DMA
Alexandre Belloni [Fri, 27 May 2016 22:54:08 +0000 (00:54 +0200)]
tty/serial: atmel: fix RS485 half duplex with DMA

commit 0058f0871efe7b01c6f2b3046c68196ab73e96da upstream.

When using DMA, half duplex doesn't work properly because rx is not stopped
before starting tx. Ensure we call atmel_stop_rx() in the DMA case.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoserial: samsung: Fix ERR pointer dereference on deferred probe
Krzysztof Kozlowski [Thu, 16 Jun 2016 06:27:35 +0000 (08:27 +0200)]
serial: samsung: Fix ERR pointer dereference on deferred probe

commit e51e4d8a185de90424b03f30181b35f29c46a25a upstream.

When the clk_get() of "uart" clock returns EPROBE_DEFER, the next re-probe
finishes with success but uses invalid (ERR_PTR) values.  This leads to
dereferencing of ERR_PTR stored under ourport->clk:

12c30000.serial: Controller clock not found
(...)
12c30000.serial: ttySAC3 at MMIO 0x12c30000 (irq = 61, base_baud = 0) is a S3C6400/10
Unable to handle kernel paging request at virtual address fffffdfb

(clk_prepare) from [<c039f7d0>] (s3c24xx_serial_pm+0x20/0x128)
(s3c24xx_serial_pm) from [<c0395414>] (uart_change_pm+0x38/0x40)
(uart_change_pm) from [<c039689c>] (uart_add_one_port+0x31c/0x44c)
(uart_add_one_port) from [<c03a035c>] (s3c24xx_serial_probe+0x2a8/0x418)
(s3c24xx_serial_probe) from [<c03ee110>] (platform_drv_probe+0x50/0xb0)
(platform_drv_probe) from [<c03ecb44>] (driver_probe_device+0x1f4/0x2b0)
(driver_probe_device) from [<c03eb0c0>] (bus_for_each_drv+0x44/0x8c)
(bus_for_each_drv) from [<c03ec8c8>] (__device_attach+0x9c/0x100)
(__device_attach) from [<c03ebf54>] (bus_probe_device+0x84/0x8c)
(bus_probe_device) from [<c03ec388>] (deferred_probe_work_func+0x60/0x8c)
(deferred_probe_work_func) from [<c012fee4>] (process_one_work+0x120/0x328)
(process_one_work) from [<c0130150>] (worker_thread+0x2c/0x4ac)
(worker_thread) from [<c0135320>] (kthread+0xd8/0xf4)
(kthread) from [<c0107978>] (ret_from_fork+0x14/0x3c)

The first unsuccessful clk_get() causes s3c24xx_serial_init_port() to
exit with failure but the s3c24xx_uart_port is left half-configured
(e.g. port->mapbase is set, clk contains ERR_PTR).  On next re-probe,
the function s3c24xx_serial_init_port() will exit early with success
because of configured port->mapbase and driver will use old values,
including the ERR_PTR as clock.

Fix this by cleaning the port->mapbase on error path so each re-probe
will initialize all of the port settings.

Fixes: 60e93575476f ("serial: samsung: enable clock before clearing pending interrupts during init")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agotty: serial: msm: Don't read off end of tx fifo
Bjorn Andersson [Fri, 3 Jun 2016 00:48:28 +0000 (17:48 -0700)]
tty: serial: msm: Don't read off end of tx fifo

commit 30acf549ca1e81859a67590ab9ecfce3d1050a0b upstream.

For dm uarts in pio mode tx data is transferred to the fifo register 4
bytes at a time, but care is not taken when these 4 bytes spans the end
of the xmit buffer so the loop might read up to 3 bytes past the buffer
and then skip the actual data at the beginning of the buffer.

Fix this by, analogous to the DMA case, make sure the chunk doesn't
wrap the xmit buffer.

Fixes: 3a878c430fd6 ("tty: serial: msm: Add TX DMA support")
Cc: Ivan Ivanov <iivanov.xz@gmail.com>
Reported-by: Frank Rowand <frowand.list@gmail.com>
Reported-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Andy Gross <andy.gross@linaro.org>
Tested-by: Frank Rowand <frank.rowand@am.sony.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoarm64: Fix incorrect per-cpu usage for boot CPU
Suzuki K Poulose [Thu, 21 Jul 2016 10:12:55 +0000 (11:12 +0100)]
arm64: Fix incorrect per-cpu usage for boot CPU

commit 9113c2aa05e9848cd4f1154abee17d4f265f012d upstream.

In smp_prepare_boot_cpu(), we invoke cpuinfo_store_boot_cpu to  store
the cpuinfo in a per-cpu ptr, before initialising the per-cpu offset for
the boot CPU. This patch reorders the sequence to make sure we initialise
the per-cpu offset before accessing the per-cpu area.

Commit 4b998ff1885eec ("arm64: Delay cpuinfo_store_boot_cpu") fixed the
issue where we modified the per-cpu area even before the kernel initialises
the per-cpu areas, but failed to wait until the boot cpu updated it's
offset.

Fixes: 4b998ff1885e ("arm64: Delay cpuinfo_store_boot_cpu")
Cc: <stable@vger.kernel.org> # 4.4+
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoarm64: debug: unmask PSTATE.D earlier
Will Deacon [Tue, 19 Jul 2016 14:07:37 +0000 (15:07 +0100)]
arm64: debug: unmask PSTATE.D earlier

commit 2ce39ad15182604beb6c8fa8bed5e46b59fd1082 upstream.

Clearing PSTATE.D is one of the requirements for generating a debug
exception. The arm64 booting protocol requires that PSTATE.D is set,
since many of the debug registers (for example, the hw_breakpoint
registers) are UNKNOWN out of reset and could potentially generate
spurious, fatal debug exceptions in early boot code if PSTATE.D was
clear. Once the debug registers have been safely initialised, PSTATE.D
is cleared, however this is currently broken for two reasons:

(1) The boot CPU clears PSTATE.D in a postcore_initcall and secondary
    CPUs clear PSTATE.D in secondary_start_kernel. Since the initcall
    runs after SMP (and the scheduler) have been initialised, there is
    no guarantee that it is actually running on the boot CPU. In this
    case, the boot CPU is left with PSTATE.D set and is not capable of
    generating debug exceptions.

(2) In a preemptible kernel, we may explicitly schedule on the IRQ
    return path to EL1. If an IRQ occurs with PSTATE.D set in the idle
    thread, then we may schedule the kthread_init thread, run the
    postcore_initcall to clear PSTATE.D and then context switch back
    to the idle thread before returning from the IRQ. The exception
    return path will then restore PSTATE.D from the stack, and set it
    again.

This patch fixes the problem by moving the clearing of PSTATE.D earlier
to proc.S. This has the desirable effect of clearing it in one place for
all CPUs, long before we have to worry about the scheduler or any
exception handling. We ensure that the previous reset of MDSCR_EL1 has
completed before unmasking the exception, so that any spurious
exceptions resulting from UNKNOWN debug registers are not generated.

Without this patch applied, the kprobes selftests have been seen to fail
under KVM, where we end up attempting to step the OOL instruction buffer
with PSTATE.D set and therefore fail to complete the step.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoarm64: kernel: Save and restore UAO and addr_limit on exception entry
James Morse [Mon, 20 Jun 2016 17:28:01 +0000 (18:28 +0100)]
arm64: kernel: Save and restore UAO and addr_limit on exception entry

commit e19a6ee2460bdd0d0055a6029383422773f9999a upstream.

If we take an exception while at EL1, the exception handler inherits
the original context's addr_limit and PSTATE.UAO values. To be consistent
always reset addr_limit and PSTATE.UAO on (re-)entry to EL1. This
prevents accidental re-use of the original context's addr_limit.

Based on a similar patch for arm from Russell King.

Cc: <stable@vger.kernel.org> # 4.6-
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
[ backport to stop perf misusing inherited addr_limit.
  Removed code interacting with UAO and the irqstack ]
Link: https://bugs.chromium.org/p/project-zero/issues/detail?id=822
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoUSB: usbfs: fix potential infoleak in devio
Kangjie Lu [Tue, 3 May 2016 20:32:16 +0000 (16:32 -0400)]
USB: usbfs: fix potential infoleak in devio

commit 681fef8380eb818c0b845fca5d2ab1dcbab114ee upstream.

The stack object “ci” has a total size of 8 bytes. Its last 3 bytes
are padding bytes which are not initialized and leaked to userland
via “copy_to_user”.

Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
Signed-off-by: Chas Williams <ciwillia@brocade.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agousb: renesas_usbhs: fix NULL pointer dereference in xfer_work()
Yoshihiro Shimoda [Wed, 8 Jun 2016 07:32:49 +0000 (16:32 +0900)]
usb: renesas_usbhs: fix NULL pointer dereference in xfer_work()

commit 4fdef698383db07d829da567e0e405fc41ff3a89 upstream.

This patch fixes an issue that the xfer_work() is possible to cause
NULL pointer dereference if the usb cable is disconnected while data
transfer is running.

In such case, a gadget driver may call usb_ep_disable()) before
xfer_work() is actually called. In this case, the usbhs_pkt_pop()
will call usbhsf_fifo_unselect(), and then usbhs_pipe_to_fifo()
in xfer_work() will return NULL.

Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoUSB: serial: option: add support for Telit LE910 PID 0x1206
Daniele Palmas [Mon, 6 Jun 2016 10:38:17 +0000 (12:38 +0200)]
USB: serial: option: add support for Telit LE910 PID 0x1206

commit 3c0415fa08548e3bc63ef741762664497ab187ed upstream.

This patch adds support for 0x1206 PID of Telit LE910.

Since the interfaces positions are the same than the ones for
0x1043 PID of Telit LE922, telit_le922_blacklist_usbcfg3 is used.

Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agousb: dwc3: fix for the isoc transfer EP_BUSY flag
Konrad Leszczynski [Mon, 8 Feb 2016 15:13:12 +0000 (16:13 +0100)]
usb: dwc3: fix for the isoc transfer EP_BUSY flag

commit 9cad39fe4e4a4fe95d8ea5a7b0692b0a6e89e38b upstream.

commit f3af36511e60 ("usb: dwc3: gadget: always
enable IOC on bulk/interrupt transfers") ended up
regressing Isochronous endpoints by clearing
DWC3_EP_BUSY flag too early, which resulted in
choppy audio playback over USB.

Fix that by partially reverting original commit and
making sure that we check for isochronous endpoints.

Fixes: f3af36511e60 ("usb: dwc3: gadget: always enable IOC
on bulk/interrupt transfers")
Signed-off-by: Konrad Leszczynski <konrad.leszczynski@intel.com>
Signed-off-by: Rafal Redzimski <rafal.f.redzimski@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agousb: quirks: Add no-lpm quirk for Elan
Joseph Salisbury [Thu, 7 Jul 2016 01:18:51 +0000 (21:18 -0400)]
usb: quirks: Add no-lpm quirk for Elan

commit 25b1f9acc452209ae0fcc8c1332be852b5c52f53 upstream.

BugLink: http://bugs.launchpad.net/bugs/1498667
As reported in BugLink, this device has an issue with Linux Power
Management so adding a quirk.  This quirk was reccomended by Alan Stern:

http://lkml.iu.edu/hypermail/linux/kernel/1606.2/05590.html

Signed-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agousb: renesas_usbhs: protect the CFIFOSEL setting in usbhsg_ep_enable()
Yoshihiro Shimoda [Wed, 8 Jun 2016 07:32:50 +0000 (16:32 +0900)]
usb: renesas_usbhs: protect the CFIFOSEL setting in usbhsg_ep_enable()

commit 15e4292a2d21e9997fdb2b8c014cc461b3f268f0 upstream.

This patch fixes an issue that the CFIFOSEL register value is possible
to be changed by usbhsg_ep_enable() wrongly. And then, a data transfer
using CFIFO may not work correctly.

For example:
 # modprobe g_multi file=usb-storage.bin
 # ifconfig usb0 192.168.1.1 up
 (During the USB host is sending file to the mass storage)
 # ifconfig usb0 down

In this case, since the u_ether.c may call usb_ep_enable() in
eth_stop(), if the renesas_usbhs driver is also using CFIFO for
mass storage, the mass storage may not work correctly.

So, this patch adds usbhs_lock() and usbhs_unlock() calling in
usbhsg_ep_enable() to protect CFIFOSEL register. This is because:
 - CFIFOSEL.CURPIPE = 0 is also needed for the pipe configuration
 - The CFIFOSEL (fifo->sel) is already protected by usbhs_lock()

Fixes: 97664a207bc2 ("usb: renesas_usbhs: shrink spin lock area")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agousb: f_fs: off by one bug in _ffs_func_bind()
Dan Carpenter [Sat, 28 May 2016 04:48:10 +0000 (07:48 +0300)]
usb: f_fs: off by one bug in _ffs_func_bind()

commit 0015f9156092d07b3ec06d37d014328419d5832e upstream.

This loop is supposed to set all the .num[] values to -1 but it's off by
one so it skips the first element and sets one element past the end of
the array.

I've cleaned up the loop a little as well.

Fixes: ddf8abd25994 ('USB: f_fs: the FunctionFS driver')
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agousb: gadget: avoid exposing kernel stack
Heinrich Schuchardt [Sun, 8 May 2016 21:20:59 +0000 (23:20 +0200)]
usb: gadget: avoid exposing kernel stack

commit ffeee83aa0461992e8a99a59db2df31933e60362 upstream.

Function in_rq_cur copies random bytes from the stack.
Zero the memory instead.

Fixes: 132fcb460839 ("usb: gadget: Add Audio Class 2.0 Driver")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoLinux 4.4.18 v4.4.18
Greg Kroah-Hartman [Tue, 16 Aug 2016 07:31:54 +0000 (09:31 +0200)]
Linux 4.4.18

8 years agomm: memcontrol: fix memcg id ref counter on swap charge move
Vladimir Davydov [Thu, 11 Aug 2016 22:33:03 +0000 (15:33 -0700)]
mm: memcontrol: fix memcg id ref counter on swap charge move

commit 615d66c37c755c49ce022c9e5ac0875d27d2603d upstream.

Since commit 73f576c04b94 ("mm: memcontrol: fix cgroup creation failure
after many small jobs") swap entries do not pin memcg->css.refcnt
directly.  Instead, they pin memcg->id.ref.  So we should adjust the
reference counters accordingly when moving swap charges between cgroups.

Fixes: 73f576c04b941 ("mm: memcontrol: fix cgroup creation failure after many small jobs")
Link: http://lkml.kernel.org/r/9ce297c64954a42dc90b543bc76106c4a94f07e8.1470219853.git.vdavydov@virtuozzo.com
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agomm: memcontrol: fix swap counter leak on swapout from offline cgroup
Vladimir Davydov [Thu, 11 Aug 2016 22:33:00 +0000 (15:33 -0700)]
mm: memcontrol: fix swap counter leak on swapout from offline cgroup

commit 1f47b61fb4077936465dcde872a4e5cc4fe708da upstream.

An offline memory cgroup might have anonymous memory or shmem left
charged to it and no swap.  Since only swap entries pin the id of an
offline cgroup, such a cgroup will have no id and so an attempt to
swapout its anon/shmem will not store memory cgroup info in the swap
cgroup map.  As a result, memcg->swap or memcg->memsw will never get
uncharged from it and any of its ascendants.

Fix this by always charging swapout to the first ancestor cgroup that
hasn't released its id yet.

[hannes@cmpxchg.org: add comment to mem_cgroup_swapout]
[vdavydov@virtuozzo.com: use WARN_ON_ONCE() in mem_cgroup_id_get_online()]
Link: http://lkml.kernel.org/r/20160803123445.GJ13263@esperanza
Fixes: 73f576c04b941 ("mm: memcontrol: fix cgroup creation failure after many small jobs")
Link: http://lkml.kernel.org/r/5336daa5c9a32e776067773d9da655d2dc126491.1470219853.git.vdavydov@virtuozzo.com
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org> [3.19+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agomm: memcontrol: fix cgroup creation failure after many small jobs
Johannes Weiner [Wed, 20 Jul 2016 22:44:57 +0000 (15:44 -0700)]
mm: memcontrol: fix cgroup creation failure after many small jobs

commit 73f576c04b9410ed19660f74f97521bee6e1c546 upstream.

The memory controller has quite a bit of state that usually outlives the
cgroup and pins its CSS until said state disappears.  At the same time
it imposes a 16-bit limit on the CSS ID space to economically store IDs
in the wild.  Consequently, when we use cgroups to contain frequent but
small and short-lived jobs that leave behind some page cache, we quickly
run into the 64k limitations of outstanding CSSs.  Creating a new cgroup
fails with -ENOSPC while there are only a few, or even no user-visible
cgroups in existence.

Although pinning CSSs past cgroup removal is common, there are only two
instances that actually need an ID after a cgroup is deleted: cache
shadow entries and swapout records.

Cache shadow entries reference the ID weakly and can deal with the CSS
having disappeared when it's looked up later.  They pose no hurdle.

Swap-out records do need to pin the css to hierarchically attribute
swapins after the cgroup has been deleted; though the only pages that
remain swapped out after offlining are tmpfs/shmem pages.  And those
references are under the user's control, so they are manageable.

This patch introduces a private 16-bit memcg ID and switches swap and
cache shadow entries over to using that.  This ID can then be recycled
after offlining when the CSS remains pinned only by objects that don't
specifically need it.

This script demonstrates the problem by faulting one cache page in a new
cgroup and deleting it again:

  set -e
  mkdir -p pages
  for x in `seq 128000`; do
    [ $((x % 1000)) -eq 0 ] && echo $x
    mkdir /cgroup/foo
    echo $$ >/cgroup/foo/cgroup.procs
    echo trex >pages/$x
    echo $$ >/cgroup/cgroup.procs
    rmdir /cgroup/foo
  done

When run on an unpatched kernel, we eventually run out of possible IDs
even though there are no visible cgroups:

  [root@ham ~]# ./cssidstress.sh
  [...]
  65000
  mkdir: cannot create directory '/cgroup/foo': No space left on device

After this patch, the IDs get released upon cgroup destruction and the
cache and css objects get released once memory reclaim kicks in.

[hannes@cmpxchg.org: init the IDR]
Link: http://lkml.kernel.org/r/20160621154601.GA22431@cmpxchg.org
Fixes: b2052564e66d ("mm: memcontrol: continue cache reclaim from offlined groups")
Link: http://lkml.kernel.org/r/20160617162516.GD19084@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reported-by: John Garcia <john.garcia@mesosphere.io>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoext4: fix reference counting bug on block allocation error
Vegard Nossum [Fri, 15 Jul 2016 03:02:47 +0000 (23:02 -0400)]
ext4: fix reference counting bug on block allocation error

commit 554a5ccc4e4a20c5f3ec859de0842db4b4b9c77e upstream.

If we hit this error when mounted with errors=continue or
errors=remount-ro:

    EXT4-fs error (device loop0): ext4_mb_mark_diskspace_used:2940: comm ext4.exe: Allocating blocks 5090-6081 which overlap fs metadata

then ext4_mb_new_blocks() will call ext4_mb_release_context() and try to
continue. However, ext4_mb_release_context() is the wrong thing to call
here since we are still actually using the allocation context.

Instead, just error out. We could retry the allocation, but there is a
possibility of getting stuck in an infinite loop instead, so this seems
safer.

[ Fixed up so we don't return EAGAIN to userspace. --tytso ]

Fixes: 8556e8f3b6 ("ext4: Don't allow new groups to be added during block allocation")
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoext4: short-cut orphan cleanup on error
Vegard Nossum [Fri, 15 Jul 2016 03:21:35 +0000 (23:21 -0400)]
ext4: short-cut orphan cleanup on error

commit c65d5c6c81a1f27dec5f627f67840726fcd146de upstream.

If we encounter a filesystem error during orphan cleanup, we should stop.
Otherwise, we may end up in an infinite loop where the same inode is
processed again and again.

    EXT4-fs (loop0): warning: checktime reached, running e2fsck is recommended
    EXT4-fs error (device loop0): ext4_mb_generate_buddy:758: group 2, block bitmap and bg descriptor inconsistent: 6117 vs 0 free clusters
    Aborting journal on device loop0-8.
    EXT4-fs (loop0): Remounting filesystem read-only
    EXT4-fs error (device loop0) in ext4_free_blocks:4895: Journal has aborted
    EXT4-fs error (device loop0) in ext4_do_update_inode:4893: Journal has aborted
    EXT4-fs error (device loop0) in ext4_do_update_inode:4893: Journal has aborted
    EXT4-fs error (device loop0) in ext4_ext_remove_space:3068: IO failure
    EXT4-fs error (device loop0) in ext4_ext_truncate:4667: Journal has aborted
    EXT4-fs error (device loop0) in ext4_orphan_del:2927: Journal has aborted
    EXT4-fs error (device loop0) in ext4_do_update_inode:4893: Journal has aborted
    EXT4-fs (loop0): Inode 16 (00000000618192a0): orphan list check failed!
    [...]
    EXT4-fs (loop0): Inode 16 (0000000061819748): orphan list check failed!
    [...]
    EXT4-fs (loop0): Inode 16 (0000000061819bf0): orphan list check failed!
    [...]

See-also: c9eb13a9105 ("ext4: fix hang when processing corrupted orphaned inode list")
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>