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drivers/vhost: Remove now-redundant read_barrier_depends()

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Because READ_ONCE() now implies read_barrier_depends(), the
read_barrier_depends() in next_desc() is now redundant.  This commit
therefore removes it and the related comments.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: <kvm@vger.kernel.org>
Cc: <virtualization@lists.linux-foundation.org>
Cc: <netdev@vger.kernel.org>
This commit is contained in:
Paul E. McKenney 2017-11-27 09:45:10 -08:00
parent 91db2592e4
commit 3a5db0b108
1 changed files with 1 additions and 6 deletions
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drivers/vhost/vhost.c
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@ -1877,12 +1877,7 @@ static unsigned next_desc(struct vhost_virtqueue *vq, struct vring_desc *desc)
return -1U;
/* Check they're not leading us off end of descriptors. */
next = vhost16_to_cpu(vq, desc->next);
/* Make sure compiler knows to grab that: we don't want it changing! */
/* We will use the result as an index in an array, so most
* architectures only need a compiler barrier here. */
read_barrier_depends();
next = vhost16_to_cpu(vq, READ_ONCE(desc->next));
return next;
}