Date: Thu, 13 Sep 2012 00:36:47 +0000 (UTC) From: Peter Grehan <grehan@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r240427 - head/sys/dev/virtio Message-ID: <201209130036.q8D0aleB080371@svn.freebsd.org>
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Author: grehan Date: Thu Sep 13 00:36:46 2012 New Revision: 240427 URL: http://svn.freebsd.org/changeset/base/240427 Log: Relax requirement of certain mb()s Submitted by: Bryan Venteicher bryanv at daemoninthecloset org Modified: head/sys/dev/virtio/virtqueue.c Modified: head/sys/dev/virtio/virtqueue.c ============================================================================== --- head/sys/dev/virtio/virtqueue.c Wed Sep 12 22:54:11 2012 (r240426) +++ head/sys/dev/virtio/virtqueue.c Thu Sep 13 00:36:46 2012 (r240427) @@ -525,7 +525,7 @@ virtqueue_dequeue(struct virtqueue *vq, used_idx = vq->vq_used_cons_idx++ & (vq->vq_nentries - 1); uep = &vq->vq_ring.used->ring[used_idx]; - mb(); + rmb(); desc_idx = (uint16_t) uep->id; if (len != NULL) *len = uep->len; @@ -623,7 +623,7 @@ vq_ring_update_avail(struct virtqueue *v avail_idx = vq->vq_ring.avail->idx & (vq->vq_nentries - 1); vq->vq_ring.avail->ring[avail_idx] = desc_idx; - mb(); + wmb(); vq->vq_ring.avail->idx++; /* Keep pending count until virtqueue_notify(). */
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