linux-kernel - [PATCH] ASoC: rt5645: Fix deadlock in rt5645_jack_detect

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Date: Sun, 11 Feb 2024 12:58:34 +0300
From: Alexey Khoroshilov <khoroshilov@...ras.ru>
To: Oder Chiou <oder_chiou@...ltek.com>
Cc: Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Shuming Fan <shumingf@...ltek.com>,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH] ASoC: rt5645: Fix deadlock in rt5645_jack_detect_work()

There is a path in rt5645_jack_detect_work(), where rt5645->jd_mutex
is left locked forever. That may lead to deadlock
when rt5645_jack_detect_work() is called for the second time.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: cdba4301adda ("ASoC: rt5650: add mutex to avoid the jack detection failure")
Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 sound/soc/codecs/rt5645.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/soc/codecs/rt5645.c b/sound/soc/codecs/rt5645.c
index 5150d6ee3748..0cc2fa131d48 100644
--- a/sound/soc/codecs/rt5645.c
+++ b/sound/soc/codecs/rt5645.c
@@ -3317,6 +3317,7 @@ static void rt5645_jack_detect_work(struct work_struct *work)
 				    report, SND_JACK_HEADPHONE);
 		snd_soc_jack_report(rt5645->mic_jack,
 				    report, SND_JACK_MICROPHONE);
+		mutex_unlock(&rt5645->jd_mutex);
 		return;
 	case 4:
 		val = snd_soc_component_read(rt5645->component, RT5645_A_JD_CTRL1) & 0x0020;
-- 
2.7.4