Re: possible deadlock in v4l2_release

[syzbot]

syzbot has bisected this bug to:

commit 757fdb51c14fda221ccb6999a865f7f895c79750
Author: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Date:   Mon May 21 08:54:59 2018 +0000

    media: vivid: add request support

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=145c3a6d200000
start commit:   757fdb51 media: vivid: add request support
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=165c3a6d200000
console output: https://syzkaller.appspot.com/x/log.txt?x=125c3a6d200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d86f24333880b605
dashboard link: https://syzkaller.appspot.com/bug?extid=ea05c832a73d0615bf33
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10b8e6a3400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14e73e2b400000

Reported-by: syzbot+ea05c832a73d0615bf33@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 757fdb51 ("media: vivid: add request support")