vhost: fix IOTLB locking
Commit 78139c94 ("net: vhost: lock the vqs one by one") moved the vq lock to improve scalability, but introduced a possible deadlock in vhost-iotlb. vhost_iotlb_notify_vq() now takes vq->mutex while holding the device's IOTLB spinlock. And on the vhost_iotlb_miss() path, the spinlock is taken while holding vq->mutex. Since calling vhost_poll_queue() doesn't require any lock, avoid the deadlock by not taking vq->mutex. Fixes: 78139c94 ("net: vhost: lock the vqs one by one") Acked-by: NJason Wang <jasowang@redhat.com> Acked-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NJean-Philippe Brucker <jean-philippe.brucker@arm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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