Some machine drivers allocate or request resources with snd_soc_link_init() phase of the card probe. These resources need to be properly released when removing a card, and this patch suggests a dual exit() callback.
The exit() is invoked in soc_remove_pcm_runtime(), which is not completely symmetric with the init() invoked in soc_init_pcm_runtime().
Alternate solutions were considered, e.g. adding a .remove() callback for the platform driver, but that's not symmetrical at all and would be difficult to handle if there are more than one dailink implementing an .init(). We looked also into using .remove_dai_link() callback, but that would also be imbalanced.
Note that because of the error handling in snd_soc_bind_card(), which jumps to probe_end, there is no way to guarantee the exit() is invoked with resources allocated in the init(). Prior to releasing those resources, implementations of the exit() callback shall check the resources are valid.
Suggested-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Reviewed-by: Guennadi Liakhovetski guennadi.liakhovetski@linux.intel.com Reviewed-by: Curtis Malainey curtis@malainey.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- include/sound/soc-link.h | 1 + include/sound/soc.h | 3 +++ sound/soc/soc-core.c | 3 +++ sound/soc/soc-link.c | 6 ++++++ 4 files changed, 13 insertions(+)
diff --git a/include/sound/soc-link.h b/include/sound/soc-link.h index 3dd6e33e94ec..337ac5666757 100644 --- a/include/sound/soc-link.h +++ b/include/sound/soc-link.h @@ -9,6 +9,7 @@ #define __SOC_LINK_H
int snd_soc_link_init(struct snd_soc_pcm_runtime *rtd); +void snd_soc_link_exit(struct snd_soc_pcm_runtime *rtd); int snd_soc_link_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd, struct snd_pcm_hw_params *params);
diff --git a/include/sound/soc.h b/include/sound/soc.h index 2756f9bcac3e..33aceadebd03 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -799,6 +799,9 @@ struct snd_soc_dai_link { /* codec/machine specific init - e.g. add machine controls */ int (*init)(struct snd_soc_pcm_runtime *rtd);
+ /* codec/machine specific exit - dual of init() */ + void (*exit)(struct snd_soc_pcm_runtime *rtd); + /* optional hw_params re-writing for BE and FE sync */ int (*be_hw_params_fixup)(struct snd_soc_pcm_runtime *rtd, struct snd_pcm_hw_params *params); diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 62c0c9482018..adedadcb0efb 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -945,6 +945,9 @@ void snd_soc_remove_pcm_runtime(struct snd_soc_card *card, { lockdep_assert_held(&client_mutex);
+ /* release machine specific resources */ + snd_soc_link_exit(rtd); + /* * Notify the machine driver for extra destruction */ diff --git a/sound/soc/soc-link.c b/sound/soc/soc-link.c index f849278beba0..1c3bf2118718 100644 --- a/sound/soc/soc-link.c +++ b/sound/soc/soc-link.c @@ -40,6 +40,12 @@ int snd_soc_link_init(struct snd_soc_pcm_runtime *rtd) return soc_link_ret(rtd, ret); }
+void snd_soc_link_exit(struct snd_soc_pcm_runtime *rtd) +{ + if (rtd->dai_link->exit) + rtd->dai_link->exit(rtd); +} + int snd_soc_link_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd, struct snd_pcm_hw_params *params) {