ASoC: core: Add card mutex locking subclasses
This is the first part of a change that is intended to improve
ASoC locking protection for DAPM and PCM operations.
This part of the series adds a mutex class for the soc_card mutex. The
SND_SOC_CARD_CLASS_INIT class is used for card initialisation only whilst the
SND_SOC_CARD_CLASS_PCM class is used for the forth coming Dynamic
PCM operations. The new mutex classes are required otherwise we will see a false
positive mutex deadlock warning between the card initialisation and the PCM
operations (something that would never deadlock in real life).
Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index a4deebc..a6da20a 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1416,7 +1416,7 @@
struct snd_soc_dai_link *dai_link;
int ret, i, order;
- mutex_lock(&card->mutex);
+ mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT);
if (card->instantiated) {
mutex_unlock(&card->mutex);