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From: Vadim Rozenfeld <vrozenfe@redhat.com>
To: kvm@vger.kernel.org
Subject: [PATCH] viostor driver.Add memory barrier - synch with fix for Linux guests by Michael S. Tsirkin <mst@redhat.com>
Date: Sun, 01 Nov 2009 12:41:13 +0200	[thread overview]
Message-ID: <4AED65C9.70602@redhat.com> (raw)

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repository: /home/vadimr/shares/kvm-guest-drivers-windows
branch: XP
commit 6906acfc2d5f58df43ebc9c190e1447ff6e63a01
Author: Vadim Rozenfeld<vrozenfe@redhat.com>
Date:   Sun Nov 1 11:54:03 2009 +0200

     [PATCH] viostor driver.Add memory read barrier - synch with fix for Linux guests by Michael S. Tsirkin<mst@redhat.com>

     Signed-off-by: Vadim Rozenfeld<vrozenfe@redhat.com>

diff --git a/viostor/virtio_ring.c b/viostor/virtio_ring.c
index d099bb8..2911cef 100644
--- a/viostor/virtio_ring.c
+++ b/viostor/virtio_ring.c
@@ -237,6 +237,8 @@ vring_get_buf(
          return NULL;
      }

+    rmb();
+
      i = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].id;
      *len = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].len;



[-- Attachment #2: rmb.patch --]
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diff --git a/viostor/virtio_ring.c b/viostor/virtio_ring.c
index d099bb8..2911cef 100644
--- a/viostor/virtio_ring.c
+++ b/viostor/virtio_ring.c
@@ -237,6 +237,8 @@ vring_get_buf(
         return NULL;
     }
 
+    rmb();
+
     i = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].id;
     *len = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].len;
 

             reply	other threads:[~2009-11-01 10:41 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-11-01 10:41 Vadim Rozenfeld [this message]
2009-11-01 13:29 ` [PATCH] viostor driver.Add memory barrier - synch with fix for Linux guests by Michael S. Tsirkin <mst@redhat.com> Yan Vugenfirer

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