drivers/virtio/virtio_ring.c · a72caae21803b74e04e2afda5e035f149d4ea118 · Detlev Casanova / linux

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13 years ago

virtio: correct the memory barrier in virtqueue_kick_prepare() · a72caae2

Jason Wang authored 13 years ago


Use virtio_mb() to make sure the available index to be exposed before
checking the the avail event. Otherwise we may get stale value of
avail event in guest and never kick the host after.

Note: this fixes a bug introduced by ee7cd898.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org

a72caae2

History

virtio: correct the memory barrier in virtqueue_kick_prepare()

Jason Wang authored 13 years ago


Use virtio_mb() to make sure the available index to be exposed before
checking the the avail event. Otherwise we may get stale value of
avail event in guest and never kick the host after.

Note: this fixes a bug introduced by ee7cd898.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org