Commit e9cb4239 authored by Jason Wang's avatar Jason Wang Committed by David S. Miller
Browse files

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: 6b1e6cc7

 ("vhost: new device IOTLB API")
Signed-off-by: default avatarJason Wang <>
Acked-by: default avatarMichael S. Tsirkin <>
Signed-off-by: default avatarDavid S. Miller <>
parent b7051cb8
......@@ -904,7 +904,7 @@ static void vhost_dev_lock_vqs(struct vhost_dev *d)
int i = 0;
for (i = 0; i < d->nvqs; ++i)
mutex_lock_nested(&d->vqs[i]->mutex, i);
static void vhost_dev_unlock_vqs(struct vhost_dev *d)
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