From: Takashi Iwai tiwai@suse.de
commit ffcf7ae90f4489047d7b076539ba207024dea5f6 upstream.
snd_ctl_remove() has to be called with card->controls_rwsem held (when called after the card instantiation). This patch adds the missing rwsem calls around it.
Fixes: 510e340efe0c ("staging: greybus: audio: Add helper APIs for dynamic audio modules") Cc: stable stable@vger.kernel.org Signed-off-by: Takashi Iwai tiwai@suse.de Link: https://lore.kernel.org/r/20211116072027.18466-1-tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/staging/greybus/audio_helper.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/staging/greybus/audio_helper.c +++ b/drivers/staging/greybus/audio_helper.c @@ -192,7 +192,11 @@ int gbaudio_remove_component_controls(st unsigned int num_controls) { struct snd_card *card = component->card->snd_card; + int err;
- return gbaudio_remove_controls(card, component->dev, controls, - num_controls, component->name_prefix); + down_write(&card->controls_rwsem); + err = gbaudio_remove_controls(card, component->dev, controls, + num_controls, component->name_prefix); + up_write(&card->controls_rwsem); + return err; }