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ASoC: fsl_xcvr: Revert fix missing lock in fsl_xcvr_mode_put()

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This reverts commit f514248727 ("ASoC: fsl_xcvr: fix missing lock in fsl_xcvr_mode_put()").

The original patch attempted to acquire the card->controls_rwsem lock in
fsl_xcvr_mode_put(). However, this function is called from the upper ALSA
core function snd_ctl_elem_write(), which already holds the write lock on
controls_rwsem for the whole put operation. So there is no need to simply
hold the lock for fsl_xcvr_activate_ctl() again.

Acquiring the read lock while holding the write lock in the same thread
results in a deadlock and a hung task, as reported by Alexander Stein.

Fixes: f514248727 ("ASoC: fsl_xcvr: fix missing lock in fsl_xcvr_mode_put()")
Reported-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Closes: https://lore.kernel.org/linux-sound/5056506.GXAFRqVoOG@steina-w/
Signed-off-by: Ziyi Guo <n7l8m4@u.northwestern.edu>
Link: https://patch.msgid.link/20260210185714.556385-1-n7l8m4@u.northwestern.edu
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ziyi Guo 2026-02-10 18:57:14 +00:00 committed by Mark Brown
parent f14c94d21f
commit 9f16d96e12
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1 changed files with 0 additions and 3 deletions
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sound/soc/fsl/fsl_xcvr.c
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@ -223,13 +223,10 @@ static int fsl_xcvr_mode_put(struct snd_kcontrol *kcontrol,
xcvr->mode = snd_soc_enum_item_to_val(e, item[0]);
down_read(&card->snd_card->controls_rwsem);
fsl_xcvr_activate_ctl(dai, fsl_xcvr_arc_mode_kctl.name,
(xcvr->mode == FSL_XCVR_MODE_ARC));
fsl_xcvr_activate_ctl(dai, fsl_xcvr_earc_capds_kctl.name,
(xcvr->mode == FSL_XCVR_MODE_EARC));
up_read(&card->snd_card->controls_rwsem);
/* Allow playback for SPDIF only */
rtd = snd_soc_get_pcm_runtime(card, card->dai_link);
rtd->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count =