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

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Message-ID: <tencent_66D84A6C740977ED66023CCD3716963E3709@qq.com>
Date: Thu, 29 Feb 2024 19:18:50 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+2622b51b35f91a00ea18@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [media?] [usb?] INFO: task hung in vb2_video_unregister_device

please test 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/usb/usbtv/usbtv-video.c b/drivers/media/usb/usbtv/usbtv-video.c
index 62a583040cd4..b55f432b44d4 100644
--- a/drivers/media/usb/usbtv/usbtv-video.c
+++ b/drivers/media/usb/usbtv/usbtv-video.c
@@ -963,7 +963,6 @@ int usbtv_video_init(struct usbtv *usbtv)
 
 void usbtv_video_free(struct usbtv *usbtv)
 {
-	mutex_lock(&usbtv->vb2q_lock);
 	mutex_lock(&usbtv->v4l2_lock);
 
 	usbtv_stop(usbtv);
@@ -971,7 +970,6 @@ void usbtv_video_free(struct usbtv *usbtv)
 	v4l2_device_disconnect(&usbtv->v4l2_dev);
 
 	mutex_unlock(&usbtv->v4l2_lock);
-	mutex_unlock(&usbtv->vb2q_lock);
 
 	v4l2_device_put(&usbtv->v4l2_dev);
 }