From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> To: Mark Brown <broonie@kernel.org> Cc: "kernelci.org bot" <bot@kernelci.org>, tomeu.vizoso@collabora.com, guillaume.tucker@collabora.com, mgalka@collabora.com, Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>, Ranjani Sridharan <ranjani.sridharan@linux.intel.com>, matthew.hart@linaro.org, khilman@baylibre.com, enric.balletbo@collabora.com, Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>, alsa-devel@alsa-project.org, Liam Girdwood <lgirdwood@gmail.com>, linux-kernel@vger.kernel.org Subject: [PATCH] ASoC: soc-core: fixup dead-lock at snd_soc_unregister_component() Date: Wed, 06 Nov 2019 16:05:05 +0900 [thread overview] Message-ID: <87bltph4da.wl-kuninori.morimoto.gx@renesas.com> (raw) From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 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> --- > Please double check/test it. 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 cc59687..94f1078 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, @@ -2853,7 +2863,7 @@ 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; -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> To: Mark Brown <broonie@kernel.org> Cc: alsa-devel@alsa-project.org, "kernelci.org bot" <bot@kernelci.org>, tomeu.vizoso@collabora.com, Liam Girdwood <lgirdwood@gmail.com>, guillaume.tucker@collabora.com, Takashi Iwai <tiwai@suse.com>, Ranjani Sridharan <ranjani.sridharan@linux.intel.com>, Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>, matthew.hart@linaro.org, mgalka@collabora.com, enric.balletbo@collabora.com, khilman@baylibre.com, linux-kernel@vger.kernel.org Subject: [alsa-devel] [PATCH] ASoC: soc-core: fixup dead-lock at snd_soc_unregister_component() Date: Wed, 06 Nov 2019 16:05:05 +0900 [thread overview] Message-ID: <87bltph4da.wl-kuninori.morimoto.gx@renesas.com> (raw) From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> 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> --- > Please double check/test it. 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 cc59687..94f1078 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, @@ -2853,7 +2863,7 @@ 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; -- 2.7.4 _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
next reply other threads:[~2019-11-06 7:05 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-06 7:05 Kuninori Morimoto [this message] 2019-11-06 7:05 ` [alsa-devel] [PATCH] ASoC: soc-core: fixup dead-lock at snd_soc_unregister_component() Kuninori Morimoto 2019-11-06 16:21 ` [alsa-devel] Applied "ASoC: soc-core: fixup dead-lock at snd_soc_unregister_component()" to the asoc tree Mark Brown
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