linux-kernel - Re: [syzbot] [media?] [usb?] INFO: task hung in vb2_video_unregister

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Message-ID: <20240229072016.186240-1-lizhi.xu@windriver.com>
Date: Thu, 29 Feb 2024 15:20:16 +0800
From: Lizhi Xu <lizhi.xu@...driver.com>
To: <syzbot+2622b51b35f91a00ea18@...kaller.appspotmail.com>
CC: <syzkaller-bugs@...glegroups.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [syzbot] [media?] [usb?] INFO: task hung in vb2_video_unregister_device

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index c575198e8354..437f80551a2d 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -1262,8 +1262,7 @@ void vb2_video_unregister_device(struct video_device *vdev)
 	get_device(&vdev->dev);
 	video_unregister_device(vdev);
 	if (vdev->queue) {
-		struct mutex *lock = vdev->queue->lock ?
-			vdev->queue->lock : vdev->lock;
+		struct mutex *lock = vdev->queue->lock;
 
 		if (lock)
 			mutex_lock(lock);