diff options
| author | Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | 2019-11-06 16:05:05 +0900 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-11-06 15:32:40 +0000 |
| commit | 18dd66ea84464a4bc86089276d5f75cadeb94a09 (patch) | |
| tree | 7c1022cca24fbbc67976f8d75a07e0e3991d8eeb | |
| parent | df95a16d2a9626dcfc3f2b3671c9b91fa076c997 (diff) | |
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>
| -rw-r--r-- | sound/soc/soc-core.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index a7ad81ec59db..55014e7ae0d8 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -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; |