This patch prevents the arcnet driver from the following deadlock.
[ 41.273910] ======================================================
[ 41.280397] [ INFO: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected ]
[ 41.287433] 4.4.0-00034-gc0ae784 #536 Not tainted
[ 41.292366] ------------------------------------------------------
[ 41.298863] arcecho/233 [HC0[0]:SC0[2]:HE0:SE0] is trying to acquire:
[ 41.305628] (&(&lp->lock)->rlock){+.+...}, at: [<
bf083bc8>] arcnet_send_packet+0x60/0x1c0 [arcnet]
[ 41.315199]
[ 41.315199] and this task is already holding:
[ 41.321324] (_xmit_ARCNET#2){+.-...}, at: [<
c06b934c>] packet_direct_xmit+0xfc/0x1c8
[ 41.329593] which would create a new lock dependency:
[ 41.334893] (_xmit_ARCNET#2){+.-...} -> (&(&lp->lock)->rlock){+.+...}
[ 41.341801]
[ 41.341801] but this new dependency connects a SOFTIRQ-irq-safe lock:
[ 41.350108] (_xmit_ARCNET#2){+.-...}
... which became SOFTIRQ-irq-safe at:
[ 41.357539] [<
c06f8fc8>] _raw_spin_lock+0x30/0x40
[ 41.362677] [<
c063ab8c>] dev_watchdog+0x5c/0x264
[ 41.367723] [<
c0094edc>] call_timer_fn+0x6c/0xf4
[ 41.372759] [<
c00950b8>] run_timer_softirq+0x154/0x210
[ 41.378340] [<
c0036b30>] __do_softirq+0x144/0x298
[ 41.383469] [<
c0036fb4>] irq_exit+0xcc/0x130
[ 41.388138] [<
c0085c50>] __handle_domain_irq+0x60/0xb4
[ 41.393728] [<
c0014578>] __irq_svc+0x58/0x78
[ 41.398402] [<
c0010274>] arch_cpu_idle+0x24/0x3c
[ 41.403443] [<
c007127c>] cpu_startup_entry+0x1f8/0x25c
[ 41.409029] [<
c09adc90>] start_kernel+0x3c0/0x3cc
[ 41.414170]
[ 41.414170] to a SOFTIRQ-irq-unsafe lock:
[ 41.419931] (&(&lp->lock)->rlock){+.+...}
... which became SOFTIRQ-irq-unsafe at:
[ 41.427996] ... [<
c06f8fc8>] _raw_spin_lock+0x30/0x40
[ 41.433409] [<
bf083d54>] arcnet_interrupt+0x2c/0x800 [arcnet]
[ 41.439646] [<
c0089120>] handle_nested_irq+0x8c/0xec
[ 41.445063] [<
c03c1170>] regmap_irq_thread+0x190/0x314
[ 41.450661] [<
c0087244>] irq_thread_fn+0x1c/0x34
[ 41.455700] [<
c0087548>] irq_thread+0x13c/0x1dc
[ 41.460649] [<
c0050f10>] kthread+0xe4/0xf8
[ 41.465158] [<
c000f810>] ret_from_fork+0x14/0x24
[ 41.470207]
[ 41.470207] other info that might help us debug this:
[ 41.470207]
[ 41.478627] Possible interrupt unsafe locking scenario:
[ 41.478627]
[ 41.485763] CPU0 CPU1
[ 41.490521] ---- ----
[ 41.495279] lock(&(&lp->lock)->rlock);
[ 41.499414] local_irq_disable();
[ 41.505636] lock(_xmit_ARCNET#2);
[ 41.511967] lock(&(&lp->lock)->rlock);
[ 41.518741] <Interrupt>
[ 41.521490] lock(_xmit_ARCNET#2);
[ 41.525356]
[ 41.525356] *** DEADLOCK ***
[ 41.525356]
[ 41.531587] 1 lock held by arcecho/233:
[ 41.535617] #0: (_xmit_ARCNET#2){+.-...}, at: [<
c06b934c>] packet_direct_xmit+0xfc/0x1c8
[ 41.544355]
the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
[ 41.552362] -> (_xmit_ARCNET#2){+.-...} ops: 27 {
[ 41.557357] HARDIRQ-ON-W at:
[ 41.560664] [<
c06f8fc8>] _raw_spin_lock+0x30/0x40
[ 41.567445] [<
c063ba28>] dev_deactivate_many+0x114/0x304
[ 41.574866] [<
c063bc3c>] dev_deactivate+0x24/0x38
[ 41.581646] [<
c0630374>] linkwatch_do_dev+0x40/0x74
[ 41.588613] [<
c06305d8>] __linkwatch_run_queue+0xec/0x140
[ 41.596120] [<
c0630658>] linkwatch_event+0x2c/0x34
[ 41.602991] [<
c004af30>] process_one_work+0x188/0x40c
[ 41.610131] [<
c004b200>] worker_thread+0x4c/0x480
[ 41.616912] [<
c0050f10>] kthread+0xe4/0xf8
[ 41.623048] [<
c000f810>] ret_from_fork+0x14/0x24
[ 41.629735] IN-SOFTIRQ-W at:
[ 41.633039] [<
c06f8fc8>] _raw_spin_lock+0x30/0x40
[ 41.639820] [<
c063ab8c>] dev_watchdog+0x5c/0x264
[ 41.646508] [<
c0094edc>] call_timer_fn+0x6c/0xf4
[ 41.653190] [<
c00950b8>] run_timer_softirq+0x154/0x210
[ 41.660425] [<
c0036b30>] __do_softirq+0x144/0x298
[ 41.667201] [<
c0036fb4>] irq_exit+0xcc/0x130
[ 41.673518] [<
c0085c50>] __handle_domain_irq+0x60/0xb4
[ 41.680754] [<
c0014578>] __irq_svc+0x58/0x78
[ 41.687077] [<
c0010274>] arch_cpu_idle+0x24/0x3c
[ 41.693769] [<
c007127c>] cpu_startup_entry+0x1f8/0x25c
[ 41.701006] [<
c09adc90>] start_kernel+0x3c0/0x3cc
[ 41.707791] INITIAL USE at:
[ 41.711003] [<
c06f8fc8>] _raw_spin_lock+0x30/0x40
[ 41.717696] [<
c063ba28>] dev_deactivate_many+0x114/0x304
[ 41.725026] [<
c063bc3c>] dev_deactivate+0x24/0x38
[ 41.731718] [<
c0630374>] linkwatch_do_dev+0x40/0x74
[ 41.738593] [<
c06305d8>] __linkwatch_run_queue+0xec/0x140
[ 41.746011] [<
c0630658>] linkwatch_event+0x2c/0x34
[ 41.752789] [<
c004af30>] process_one_work+0x188/0x40c
[ 41.759847] [<
c004b200>] worker_thread+0x4c/0x480
[ 41.766541] [<
c0050f10>] kthread+0xe4/0xf8
[ 41.772596] [<
c000f810>] ret_from_fork+0x14/0x24
[ 41.779198] }
[ 41.780945] ... key at: [<
c124d620>] netdev_xmit_lock_key+0x38/0x1c8
[ 41.788192] ... acquired at:
[ 41.791309] [<
c007bed8>] lock_acquire+0x70/0x90
[ 41.796361] [<
c06f9140>] _raw_spin_lock_irqsave+0x40/0x54
[ 41.802324] [<
bf083bc8>] arcnet_send_packet+0x60/0x1c0 [arcnet]
[ 41.808844] [<
c06b9380>] packet_direct_xmit+0x130/0x1c8
[ 41.814622] [<
c06bc7e4>] packet_sendmsg+0x3b8/0x680
[ 41.820034] [<
c05fe8b0>] sock_sendmsg+0x14/0x24
[ 41.825091] [<
c05ffd68>] SyS_sendto+0xb8/0xe0
[ 41.829956] [<
c05ffda8>] SyS_send+0x18/0x20
[ 41.834638] [<
c000f780>] ret_fast_syscall+0x0/0x1c
[ 41.839954]
[ 41.841514]
the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock:
[ 41.850302] -> (&(&lp->lock)->rlock){+.+...} ops: 5 {
[ 41.855644] HARDIRQ-ON-W at:
[ 41.858945] [<
c06f8fc8>] _raw_spin_lock+0x30/0x40
[ 41.865726] [<
bf083d54>] arcnet_interrupt+0x2c/0x800 [arcnet]
[ 41.873607] [<
c0089120>] handle_nested_irq+0x8c/0xec
[ 41.880666] [<
c03c1170>] regmap_irq_thread+0x190/0x314
[ 41.887901] [<
c0087244>] irq_thread_fn+0x1c/0x34
[ 41.894593] [<
c0087548>] irq_thread+0x13c/0x1dc
[ 41.901195] [<
c0050f10>] kthread+0xe4/0xf8
[ 41.907338] [<
c000f810>] ret_from_fork+0x14/0x24
[ 41.914025] SOFTIRQ-ON-W at:
[ 41.917328] [<
c06f8fc8>] _raw_spin_lock+0x30/0x40
[ 41.924106] [<
bf083d54>] arcnet_interrupt+0x2c/0x800 [arcnet]
[ 41.931981] [<
c0089120>] handle_nested_irq+0x8c/0xec
[ 41.939028] [<
c03c1170>] regmap_irq_thread+0x190/0x314
[ 41.946264] [<
c0087244>] irq_thread_fn+0x1c/0x34
[ 41.952954] [<
c0087548>] irq_thread+0x13c/0x1dc
[ 41.959548] [<
c0050f10>] kthread+0xe4/0xf8
[ 41.965689] [<
c000f810>] ret_from_fork+0x14/0x24
[ 41.972379] INITIAL USE at:
[ 41.975595] [<
c06f8fc8>] _raw_spin_lock+0x30/0x40
[ 41.982283] [<
bf083d54>] arcnet_interrupt+0x2c/0x800 [arcnet]
[ 41.990063] [<
c0089120>] handle_nested_irq+0x8c/0xec
[ 41.997027] [<
c03c1170>] regmap_irq_thread+0x190/0x314
[ 42.004172] [<
c0087244>] irq_thread_fn+0x1c/0x34
[ 42.010766] [<
c0087548>] irq_thread+0x13c/0x1dc
[ 42.017267] [<
c0050f10>] kthread+0xe4/0xf8
[ 42.023314] [<
c000f810>] ret_from_fork+0x14/0x24
[ 42.029903] }
[ 42.031648] ... key at: [<
bf0854cc>] __key.42091+0x0/0xfffff0f8 [arcnet]
[ 42.039255] ... acquired at:
[ 42.042372] [<
c007bed8>] lock_acquire+0x70/0x90
[ 42.047413] [<
c06f9140>] _raw_spin_lock_irqsave+0x40/0x54
[ 42.053364] [<
bf083bc8>] arcnet_send_packet+0x60/0x1c0 [arcnet]
[ 42.059872] [<
c06b9380>] packet_direct_xmit+0x130/0x1c8
[ 42.065634] [<
c06bc7e4>] packet_sendmsg+0x3b8/0x680
[ 42.071030] [<
c05fe8b0>] sock_sendmsg+0x14/0x24
[ 42.076069] [<
c05ffd68>] SyS_sendto+0xb8/0xe0
[ 42.080926] [<
c05ffda8>] SyS_send+0x18/0x20
[ 42.085601] [<
c000f780>] ret_fast_syscall+0x0/0x1c
[ 42.090918]
[ 42.092481]
[ 42.092481] stack backtrace:
[ 42.097065] CPU: 0 PID: 233 Comm: arcecho Not tainted 4.4.0-00034-gc0ae784 #536
[ 42.104751] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 42.111183] [<
c0017ec8>] (unwind_backtrace) from [<
c00139d0>] (show_stack+0x10/0x14)
[ 42.119337] [<
c00139d0>] (show_stack) from [<
c02a82c4>] (dump_stack+0x8c/0x9c)
[ 42.126937] [<
c02a82c4>] (dump_stack) from [<
c0078260>] (check_usage+0x4bc/0x63c)
[ 42.134815] [<
c0078260>] (check_usage) from [<
c0078438>] (check_irq_usage+0x58/0xb0)
[ 42.142964] [<
c0078438>] (check_irq_usage) from [<
c007aaa0>] (__lock_acquire+0x1524/0x20b0)
[ 42.151740] [<
c007aaa0>] (__lock_acquire) from [<
c007bed8>] (lock_acquire+0x70/0x90)
[ 42.159886] [<
c007bed8>] (lock_acquire) from [<
c06f9140>] (_raw_spin_lock_irqsave+0x40/0x54)
[ 42.168768] [<
c06f9140>] (_raw_spin_lock_irqsave) from [<
bf083bc8>] (arcnet_send_packet+0x60/0x1c0 [arcnet])
[ 42.179115] [<
bf083bc8>] (arcnet_send_packet [arcnet]) from [<
c06b9380>] (packet_direct_xmit+0x130/0x1c8)
[ 42.189182] [<
c06b9380>] (packet_direct_xmit) from [<
c06bc7e4>] (packet_sendmsg+0x3b8/0x680)
[ 42.198059] [<
c06bc7e4>] (packet_sendmsg) from [<
c05fe8b0>] (sock_sendmsg+0x14/0x24)
[ 42.206199] [<
c05fe8b0>] (sock_sendmsg) from [<
c05ffd68>] (SyS_sendto+0xb8/0xe0)
[ 42.213978] [<
c05ffd68>] (SyS_sendto) from [<
c05ffda8>] (SyS_send+0x18/0x20)
[ 42.221388] [<
c05ffda8>] (SyS_send) from [<
c000f780>] (ret_fast_syscall+0x0/0x1c)
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
---
v1 -> v2: removed unneeded zero assignment of flags
Signed-off-by: David S. Miller <davem@davemloft.net>