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ASoC: soc-core: fixup dead-lock at snd_soc_unregister_component() 

snd_soc_unregister_component() is calling snd_soc_lookup_component()
under mutex_lock(). But, snd_soc_lookup_component() itself is using
mutex_lock(), thus it will be dead-lock.
This patch adds _nolocked version of it, and avoid dead-lock issue.

Fixes: ac6a4dd3e9f0("ASoC: soc-core: use snd_soc_lookup_component() at snd_soc_unregister_component()")
Reported-by: "kernelci.org bot" <bot@kernelci.org>"
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87bltph4da.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Kuninori Morimoto 2019-11-06 16:05:05 +09:00 committed by Mark Brown
parent df95a16d2a
commit 18dd66ea84
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GPG Key ID: 24D68B725D5487D0
1 changed files with 15 additions and 5 deletions
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20
sound/soc/soc-core.c
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@ -356,14 +356,13 @@ struct snd_soc_component *snd_soc_rtdcom_lookup(struct snd_soc_pcm_runtime *rtd,
}
EXPORT_SYMBOL_GPL(snd_soc_rtdcom_lookup);
struct snd_soc_component *snd_soc_lookup_component(struct device *dev,
const char *driver_name)
static struct snd_soc_component
*snd_soc_lookup_component_nolocked(struct device *dev, const char *driver_name)
{
struct snd_soc_component *component;
struct snd_soc_component *found_component;
found_component = NULL;
mutex_lock(&client_mutex);
for_each_component(component) {
if ((dev == component->dev) &&
(!driver_name ||
@ -373,10 +372,21 @@ struct snd_soc_component *snd_soc_lookup_component(struct device *dev,
break;
}
}
mutex_unlock(&client_mutex);
return found_component;
}
struct snd_soc_component *snd_soc_lookup_component(struct device *dev,
const char *driver_name)
{
struct snd_soc_component *component;
mutex_lock(&client_mutex);
component = snd_soc_lookup_component_nolocked(dev, driver_name);
mutex_unlock(&client_mutex);
return component;
}
EXPORT_SYMBOL_GPL(snd_soc_lookup_component);
struct snd_pcm_substream *snd_soc_get_dai_substream(struct snd_soc_card *card,
@ -2855,7 +2865,7 @@ void snd_soc_unregister_component(struct device *dev)
mutex_lock(&client_mutex);
while (1) {
component = snd_soc_lookup_component(dev, NULL);
component = snd_soc_lookup_component_nolocked(dev, NULL);
if (!component)
break;