linux-kernel - [PATCH 5.10 09/20] ALSA: hda/hdmi: Fix incorrect mutex unlock in silent_stream

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Message-Id: <20210107143053.692413931@linuxfoundation.org>
Date:   Thu,  7 Jan 2021 15:34:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Jan Alexander Steffens (heftig)" <heftig@...hlinux.org>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 5.10 09/20] ALSA: hda/hdmi: Fix incorrect mutex unlock in silent_stream_disable()

From: Takashi Iwai <tiwai@...e.de>

commit 3d5c5fdcee0f9a94deb0472e594706018b00aa31 upstream.

The silent_stream_disable() function introduced by the commit
b1a5039759cb ("ALSA: hda/hdmi: fix silent stream for first playback to
DP") takes the per_pin->lock mutex, but it unlocks the wrong one,
spec->pcm_lock, which causes a deadlock.  This patch corrects it.

Fixes: b1a5039759cb ("ALSA: hda/hdmi: fix silent stream for first playback to DP")
Reported-by: Jan Alexander Steffens (heftig) <heftig@...hlinux.org>
Cc: <stable@...r.kernel.org>
Acked-by: Kai Vehmanen <kai.vehmanen@...ux.intel.com>
Link: https://lore.kernel.org/r/20210101083852.12094-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/pci/hda/patch_hdmi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1736,7 +1736,7 @@ static void silent_stream_disable(struct
 	per_pin->silent_stream = false;
 
  unlock_out:
-	mutex_unlock(&spec->pcm_lock);
+	mutex_unlock(&per_pin->lock);
 }
 
 /* update ELD and jack state via audio component */