[PATCH 5.1 42/96] ASoC: core: Fix deadlock in snd_soc_instantiate_card()

[Greg Kroah-Hartman]

[ Upstream commit 495f926c68ddb905a7a0192963096138c6a934e1 ]

Move the client_mutex lock to snd_soc_unbind_card() before
removing link components. This prevents the deadlock
in the error path in snd_soc_instantiate_card().

Fixes: 34ac3c3eb8 (ASoC: core: lock client_mutex while removing
link components)
Reported-by: kernelci.org bot <b...@kernelci.org>
Signed-off-by: Ranjani Sridharan <ranjani.sridha...@linux.intel.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 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 9df3bdeb5c47..c010cc864cf3 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1008,14 +1008,12 @@ static void soc_remove_link_components(struct 
snd_soc_card *card,
        struct snd_soc_component *component;
        struct snd_soc_rtdcom_list *rtdcom;
 
-       mutex_lock(&client_mutex);
        for_each_rtdcom(rtd, rtdcom) {
                component = rtdcom->component;
 
                if (component->driver->remove_order == order)
                        soc_remove_component(component);
        }
-       mutex_unlock(&client_mutex);
 }
 
 static void soc_remove_dai_links(struct snd_soc_card *card)
@@ -2836,12 +2834,14 @@ 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)
-- 
2.20.1