From: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
Date: Fri, 30 Nov 2018 16:05:53 +0000
> Commit 78139c94dc8c ("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: 78139c94dc8c ("net: vhost: lock the vqs one by one")
> Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
> Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
Applied, thank you.
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