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| author |   Jean-Philippe Brucker <jean-philippe.brucker@arm.com> | 2018-11-30 16:05:53 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-12-03 15:52:30 -0800 |
| commit | e3f787189e10f5fafce77ba8aa948741ebb93c2b (patch) | |
| tree | 44b0e172af8f8621f15351aa2307642ba6fe25cf /LICENSES | |
| parent | Merge branch 'phy-micrel-toggling-reset' (diff) | |
| download | linux-dev-e3f787189e10f5fafce77ba8aa948741ebb93c2b.tar.xz linux-dev-e3f787189e10f5fafce77ba8aa948741ebb93c2b.zip | |
vhost: fix IOTLB locking
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@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'LICENSES')
0 files changed, 0 insertions, 0 deletions