From: Jason Wang <redacted>
Date: Tue, 23 Jan 2018 17:27:25 +0800

We used to call mutex_lock() in vhost_dev_lock_vqs() which tries to
hold mutexes of all virtqueues. This may confuse lockdep to report a
possible deadlock because of trying to hold locks belong to same
class. Switch to use mutex_lock_nested() to avoid false positive.

Fixes: 6b1e6cc7855b0 ("vhost: new device IOTLB API")
Reported-by: syzbot+dbb7c1161485e61b0241@syzkaller.appspotmail.com
Signed-off-by: Jason Wang <redacted>

Michael, I see you ACK'd this, meaning that you're OK with these two
fixes going via my net tree?

Thanks.