tree ec51d4cba4240af6011f4fabfda06a21532761da
parent 0b22bd0ba0d500ab40e7673c591c594ec5447342
author Michael S. Tsirkin <mst@redhat.com> 1256477333 +0200
committer Rusty Russell <rusty@rustcorp.com.au> 1256768437 +1030

virtio: order used ring after used index read

On SMP guests, reads from the ring might bypass used index reads. This
causes guest crashes because host writes to used index to signal ring
data readiness.  Fix this by inserting rmb before used ring reads.

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