https://github.com/torvalds/linux
Revision 783513eec3209542fcd6ac0cbcb030b3c17a4827 authored by Charles Keepax on 29 December 2015, 16:25:13 UTC, committed by Mark Brown on 30 December 2015, 16:48:13 UTC
snd_soc_dapm_mutex_lock currently uses the un-nested call which can
cause lockdep warnings when called from control handlers (a relatively
common usage) and using modules. As creating the control causes a
potential mutex inversion with the handler, creating the control will
take the controls_rwsem under the dapm_mutex and accessing the control
will take the dapm_mutex under controls_rwsem.

All the users look like they want to be using the runtime class of the
lock anyway, so this patch just changes snd_soc_dapm_mutex_lock to use
the nested call, with the SND_SOC_DAPM_CLASS_RUNTIME class.

Fixes: f6d5e586b416 ("ASoC: dapm: Add helpers to lock/unlock DAPM mutex")
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
1 parent 8005c49
History
Tip revision: 783513eec3209542fcd6ac0cbcb030b3c17a4827 authored by Charles Keepax on 29 December 2015, 16:25:13 UTC
ASoC: Use nested lock for snd_soc_dapm_mutex_lock
Tip revision: 783513e
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