linux-kernel - [PATCH] staging: sound: Adjust mutex unlock order

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Message-ID: <20250716062331.375090-1-karanja99erick@gmail.com>
Date: Wed, 16 Jul 2025 09:23:30 +0300
From: Erick Karanja <karanja99erick@...il.com>
To: perex@...ex.cz,
	tiwai@...e.com
Cc: linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	julia.lawall@...ia.fr,
	Erick Karanja <karanja99erick@...il.com>
Subject: [PATCH] staging: sound: Adjust mutex unlock order

The mutexes qdev_mutex and chip->mutex are acquired in that order
throughout the driver. To preserve proper lock hierarchy and avoid
potential deadlocks, they must be released in the reverse order
of acquisition.

This change reorders the unlock sequence to first release chip->mutex
followed by qdev_mutex, ensuring consistency with the locking pattern.

Signed-off-by: Erick Karanja <karanja99erick@...il.com>
---
 sound/usb/qcom/qc_audio_offload.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/qcom/qc_audio_offload.c b/sound/usb/qcom/qc_audio_offload.c
index 3543b5a53592..ef144d2be7d2 100644
--- a/sound/usb/qcom/qc_audio_offload.c
+++ b/sound/usb/qcom/qc_audio_offload.c
@@ -825,8 +825,8 @@ static int uaudio_sideband_notifier(struct usb_interface *intf,
 		}
 	}
 
-	mutex_unlock(&qdev_mutex);
 	mutex_unlock(&chip->mutex);
+	mutex_unlock(&qdev_mutex);
 
 	return 0;
 }
-- 
2.43.0