ASoC: core: Fix component_list corruption when unloading modules (4da53393) · Commits · 戴 / test

This fixes module unload regressions introduced by commits ("ASoC: Track which components have been registered with snd_soc_register_component()") and ("ASoC: Let snd_soc_platform subclass snd_soc_component"). First commit causes component_list to be corrupted when removing codec and second when removing platform. Reason for both is that components associated with platform or codec are never removed from the list because for them registered_as_component field in struct snd_soc_component is always false. Now list becomes corrupted when snd_soc_unregister_platform() or snd_soc_unregister_codec() frees the platform or codec structure and where the associated struct snd_soc_component is embedded. Fix these by moving component unregistration and cleanup to a new local function __snd_soc_unregister_component() that takes component as its argument. Since component is known for platforms and codecs the __snd_soc_unregister_component() can be called directly and snd_soc_unregister_component() takes care to find and unregister only components that were registered using snd_soc_register_component(). Signed-off-by:

Jarkko Nikula <jarkko.nikula@linux.intel.com> Acked-by:

Lars-Peter Clausen <lars@metafoo.de> Signed-off-by:

Mark Brown <broonie@linaro.org>

sound/soc/soc-core.c

+15 −10

Original line number	Diff line number	Diff line
		@@ -4010,6 +4010,18 @@ int snd_soc_register_component(struct device *dev,
		}
		EXPORT_SYMBOL_GPL(snd_soc_register_component);

		static void __snd_soc_unregister_component(struct snd_soc_component *cmpnt)
		{
		snd_soc_unregister_dais(cmpnt);

		mutex_lock(&client_mutex);
		list_del(&cmpnt->list);
		mutex_unlock(&client_mutex);

		dev_dbg(cmpnt->dev, "ASoC: Unregistered component '%s'\n", cmpnt->name);
		kfree(cmpnt->name);
		}

		/**
		* snd_soc_unregister_component - Unregister a component from the ASoC core
		*
		@@ -4025,14 +4037,7 @@ void snd_soc_unregister_component(struct device *dev)
		return;

		found:
		snd_soc_unregister_dais(cmpnt);

		mutex_lock(&client_mutex);
		list_del(&cmpnt->list);
		mutex_unlock(&client_mutex);

		dev_dbg(dev, "ASoC: Unregistered component '%s'\n", cmpnt->name);
		kfree(cmpnt->name);
		__snd_soc_unregister_component(cmpnt);
		}
		EXPORT_SYMBOL_GPL(snd_soc_unregister_component);

		@@ -4132,7 +4137,7 @@ EXPORT_SYMBOL_GPL(snd_soc_register_platform);
		*/
		void snd_soc_remove_platform(struct snd_soc_platform *platform)
		{
		snd_soc_unregister_component(platform->dev);
		__snd_soc_unregister_component(&platform->component);

		mutex_lock(&client_mutex);
		list_del(&platform->list);
		@@ -4337,7 +4342,7 @@ void snd_soc_unregister_codec(struct device *dev)
		return;

		found:
		snd_soc_unregister_component(dev);
		__snd_soc_unregister_component(&codec->component);

		mutex_lock(&client_mutex);
		list_del(&codec->list);

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