linux-kernel - [PATCH 3.16 024/148] [media] usbvision: fix locking error

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Message-ID: <lsq.1581185940.977876534@decadent.org.uk>
Date:   Sat, 08 Feb 2020 18:19:23 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Insu Yun" <wuninsu@...il.com>,
        "Mauro Carvalho Chehab" <mchehab@....samsung.com>
Subject: [PATCH 3.16 024/148] [media] usbvision: fix locking error

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Insu Yun <wuninsu@...il.com>

commit 5ce625a42d6206d5a18222c6475f6b866ef68569 upstream.

When remove_pending is non-zero, v4l2_lock is never unlocked.

Signed-off-by: Insu Yun <wuninsu@...il.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/usb/usbvision/usbvision-video.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/usb/usbvision/usbvision-video.c
+++ b/drivers/media/usb/usbvision/usbvision-video.c
@@ -1175,6 +1175,7 @@ static int usbvision_radio_close(struct
 	usbvision_audio_off(usbvision);
 	usbvision->radio = 0;
 	usbvision->user--;
+	mutex_unlock(&usbvision->v4l2_lock);
 
 	if (usbvision->remove_pending) {
 		printk(KERN_INFO "%s: Final disconnect\n", __func__);
@@ -1182,7 +1183,6 @@ static int usbvision_radio_close(struct
 		return err_code;
 	}
 
-	mutex_unlock(&usbvision->v4l2_lock);
 	PDEBUG(DBG_IO, "success");
 	return err_code;
 }