From 18dd66ea84464a4bc86089276d5f75cadeb94a09 Mon Sep 17 00:00:00 2001 From: Kuninori Morimoto Date: Wed, 6 Nov 2019 16:05:05 +0900 Subject: 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" " Signed-off-by: Kuninori Morimoto Link: https://lore.kernel.org/r/87bltph4da.wl-kuninori.morimoto.gx@renesas.com Signed-off-by: Mark Brown --- sound/soc/soc-core.c | 20 +++++++++++++++----- 1 file 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; -- cgit v1.2.3-59-g8ed1b