]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
vhost: use mutex_lock_nested() in vhost_dev_lock_vqs()
authorJason Wang <jasowang@redhat.com>
Tue, 23 Jan 2018 09:27:25 +0000 (17:27 +0800)
committerDavid S. Miller <davem@davemloft.net>
Wed, 24 Jan 2018 21:55:37 +0000 (16:55 -0500)
commite9cb4239134c860e5f92c75bf5321bd377bb505b
tree07574c95ec8663139c964f4355c559ee27b379f8
parentb7051cb8dadd69f85da5989017af2bb35b418950
vhost: use mutex_lock_nested() in vhost_dev_lock_vqs()

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 <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/vhost/vhost.c