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linux/drivers/net/wireless/ath
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Tobias Klausmann d1f1c0e289 ath9k: do not return early to fix rcu unlocking 
Starting with commit d94a461d7a ("ath9k: use ieee80211_tx_status_noskb
where possible") the driver uses rcu_read_lock() && rcu_read_unlock(), yet on
returning early in ath_tx_edma_tasklet() the unlock is missing leading to stalls
and suspicious RCU usage:

 ===============================
 [ INFO: suspicious RCU usage. ]
 4.9.0-rc8 #11 Not tainted
 -------------------------------
 kernel/rcu/tree.c:705 Illegal idle entry in RCU read-side critical section.!

 other info that might help us debug this:

 RCU used illegally from idle CPU!
 rcu_scheduler_active = 1, debug_locks = 0
 RCU used illegally from extended quiescent state!
 1 lock held by swapper/7/0:
 #0:
  (
 rcu_read_lock
 ){......}
 , at:
 [<ffffffffa06ed110>] ath_tx_edma_tasklet+0x0/0x450 [ath9k]

 stack backtrace:
 CPU: 7 PID: 0 Comm: swapper/7 Not tainted 4.9.0-rc8 #11
 Hardware name: Acer Aspire V3-571G/VA50_HC_CR, BIOS V2.21 12/16/2013
  ffff88025efc3f38 ffffffff8132b1e5 ffff88017ede4540 0000000000000001
  ffff88025efc3f68 ffffffff810a25f7 ffff88025efcee60 ffff88017edebdd8
  ffff88025eeb5400 0000000000000091 ffff88025efc3f88 ffffffff810c3cd4
 Call Trace:
  <IRQ>
  [<ffffffff8132b1e5>] dump_stack+0x68/0x93
  [<ffffffff810a25f7>] lockdep_rcu_suspicious+0xd7/0x110
  [<ffffffff810c3cd4>] rcu_eqs_enter_common.constprop.85+0x154/0x200
  [<ffffffff810c5a54>] rcu_irq_exit+0x44/0xa0
  [<ffffffff81058631>] irq_exit+0x61/0xd0
  [<ffffffff81018d25>] do_IRQ+0x65/0x110
  [<ffffffff81672189>] common_interrupt+0x89/0x89
  <EOI>
  [<ffffffff814ffe11>] ? cpuidle_enter_state+0x151/0x200
  [<ffffffff814ffee2>] cpuidle_enter+0x12/0x20
  [<ffffffff8109a6ae>] call_cpuidle+0x1e/0x40
  [<ffffffff8109a8f6>] cpu_startup_entry+0x146/0x220
  [<ffffffff810336f8>] start_secondary+0x148/0x170

Signed-off-by: Tobias Klausmann <tobias.johannes.klausmann@mni.thm.de>
Fixes: d94a461d7a ("ath9k: use ieee80211_tx_status_noskb where possible")
Cc: <stable@vger.kernel.org> # v4.9
Acked-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Gabriel Craciunescu <nix.or.die@gmail.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
2016-12-21 16:28:32 +02:00
..
ar5523 net: wireless: ath: ar5523: ar5523: don't print error when allocating urb fails 2016-08-13 14:53:40 -07:00
ath5k ath5k: drop duplicate header vmalloc.h 2016-12-01 13:23:19 +02:00
ath6kl wireless-drivers-next patches for 4.10 2016-11-27 20:26:59 -05:00
ath9k ath9k: do not return early to fix rcu unlocking 2016-12-21 16:28:32 +02:00
ath10k ath10k: free host-mem with DMA_BIRECTIONAL flag 2016-12-20 17:04:31 +02:00
carl9170 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-10-05 10:11:24 -07:00
wcn36xx wcn36xx: Silence error about unsupported smd event 188 2016-07-08 17:04:40 +03:00
wil6210 Makefile: drop -D__CHECK_ENDIAN__ from cflags 2016-12-16 00:13:43 +02:00
ath.h ath9k: add a helper to get the string representation of ath_bus_type 2016-11-15 16:55:37 +02:00
debug.c
dfs_pattern_detector.c ath: constify local structures 2016-09-14 20:01:39 +03:00
dfs_pattern_detector.h
dfs_pri_detector.c
dfs_pri_detector.h
hw.c
Kconfig
key.c
main.c ath9k: add a helper to get the string representation of ath_bus_type 2016-11-15 16:55:37 +02:00
Makefile Makefile: drop -D__CHECK_ENDIAN__ from cflags 2016-12-16 00:13:43 +02:00
reg.h
regd.c ath: export alpha2 helper 2016-10-04 18:01:48 +03:00
regd.h ath: export alpha2 helper 2016-10-04 18:01:48 +03:00
regd_common.h
spectral_common.h
trace.c
trace.h