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coresight: cpu-debug: Replace mutex with mutex_trylock on panic notifier

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[ Upstream commit 1adff542d67a2ed1120955cb219bfff8a9c53f59 ]

The panic notifier infrastructure executes registered callbacks when
a panic event happens - such callbacks are executed in atomic context,
with interrupts and preemption disabled in the running CPU and all other
CPUs disabled. That said, mutexes in such context are not a good idea.

This patch replaces a regular mutex with a mutex_trylock safer approach;
given the nature of the mutex used in the driver, it should be pretty
uncommon being unable to acquire such mutex in the panic path, hence
no functional change should be observed (and if it is, that would be
likely a deadlock with the regular mutex).

Fixes: 2227b7c746 ("coresight: add support for CPU debug module")
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20220427224924.592546-10-gpiccoli@igalia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Guilherme G. Piccoli 2022-04-27 19:49:03 -03:00 committed by Greg Kroah-Hartman
parent 47ebc50dc2
commit 96414e2cdc
1 changed files with 4 additions and 3 deletions
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7
drivers/hwtracing/coresight/coresight-cpu-debug.c
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@ -379,9 +379,10 @@ static int debug_notifier_call(struct notifier_block *self,
int cpu;
struct debug_drvdata *drvdata;
mutex_lock(&debug_lock);
/* Bail out if we can't acquire the mutex or the functionality is off */
if (!mutex_trylock(&debug_lock))
return NOTIFY_DONE;
/* Bail out if the functionality is disabled */
if (!debug_enable)
goto skip_dump;
@ -400,7 +401,7 @@ static int debug_notifier_call(struct notifier_block *self,
skip_dump:
mutex_unlock(&debug_lock);
return 0;
return NOTIFY_DONE;
}
static struct notifier_block debug_notifier = {