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The following is the lockdep warning which detects possible
deadlock condition with the way ar->lock and ar->list_lock
are being used.
(&(&ar->lock)->rlock){+.-...}, at: [<ffffffffa0492d13>] ath6kl_indicate_tx_activity+0x83/0x110 [ath6kl]
but this lock took another, SOFTIRQ-unsafe lock in the past:
(&(&ar->list_lock)->rlock){+.+...}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&ar->list_lock)->rlock);
local_irq_disable();
lock(&(&ar->lock)->rlock);
lock(&(&ar->list_lock)->rlock);
<Interrupt>
lock(&(&ar->lock)->rlock);
*** DEADLOCK ***
softirqs have to be disabled when acquiring ar->list_lock to avoid
the above deadlock condition. When the above warning printed the
interface is still up and running without issue.
Reported-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
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| .. | ||
| bmi.c | ||
| bmi.h | ||
| cfg80211.c | ||
| cfg80211.h | ||
| common.h | ||
| core.h | ||
| debug.c | ||
| debug.h | ||
| hif-ops.h | ||
| hif.c | ||
| hif.h | ||
| htc.c | ||
| htc.h | ||
| init.c | ||
| Kconfig | ||
| main.c | ||
| Makefile | ||
| sdio.c | ||
| target.h | ||
| testmode.c | ||
| testmode.h | ||
| txrx.c | ||
| wmi.c | ||
| wmi.h | ||