From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com
commit 34ac3c3eb8f0c07 ("ASoC: core: lock client_mutex while removing link components") added mutex_lock() at soc_remove_link_components().
Is is called from snd_soc_unbind_card()
snd_soc_unbind_card() => soc_remove_link_components() soc_cleanup_card_resources() soc_remove_dai_links() => soc_remove_link_components()
And, there are 2 way to call it.
(1) snd_soc_unregister_component() ** mutex_lock() snd_soc_component_del_unlocked() => snd_soc_unbind_card() ** mutex_unlock()
(2) snd_soc_unregister_card() => snd_soc_unbind_card()
(1) case is already using mutex_lock() when it calles snd_soc_unbind_card(), thus, we will get lockdep warning.
commit 495f926c68ddb90 ("ASoC: core: Fix deadlock in snd_soc_instantiate_card()") tried to fixup it, but still not enough. We still have lockdep warning when we try unbind/bind.
We need mutex_lock() under snd_soc_unregister_card() instead of snd_remove_link_components()/snd_soc_unbind_card().
Fixes: 34ac3c3eb8f0c07 ("ASoC: core: lock client_mutex while removing link components") Fixes: 495f926c68ddb90 ("ASoC: core: Fix deadlock in snd_soc_instantiate_card()") Signed-off-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com --- sound/soc/soc-core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 2353886..2a408cc 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -2747,14 +2747,12 @@ static void snd_soc_unbind_card(struct snd_soc_card *card, bool unregister) snd_soc_dapm_shutdown(card); snd_soc_flush_all_delayed_work(card);
- mutex_lock(&client_mutex); /* remove all components used by DAI links on this card */ for_each_comp_order(order) { for_each_card_rtds(card, rtd) { soc_remove_link_components(card, rtd, order); } } - mutex_unlock(&client_mutex);
soc_cleanup_card_resources(card); if (!unregister) @@ -2773,7 +2771,9 @@ static void snd_soc_unbind_card(struct snd_soc_card *card, bool unregister) */ int snd_soc_unregister_card(struct snd_soc_card *card) { + mutex_lock(&client_mutex); snd_soc_unbind_card(card, true); + mutex_unlock(&client_mutex); dev_dbg(card->dev, "ASoC: Unregistered card '%s'\n", card->name);
return 0;