[ 3.5.yuz extended stable ] Patch "vhost: fix mergeable bufs on BE hosts" has been added to staging queue

Herton Ronaldo Krzesinski herton.krzesinski at canonical.com
Thu Nov 22 04:49:20 UTC 2012

This is a note to let you know that I have just added a patch titled

    vhost: fix mergeable bufs on BE hosts

to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.yuz tree, see



>From 4344317c81c2f4de4afad535ddf6c214fdfd47b9 Mon Sep 17 00:00:00 2001
From: "Michael S. Tsirkin" <mst at redhat.com>
Date: Wed, 24 Oct 2012 20:37:51 +0200
Subject: [PATCH] vhost: fix mergeable bufs on BE hosts

commit 910a578f7e9400a78a3b13aba0b4d2df16a2cb05 upstream.

We copy head count to a 16 bit field, this works by chance on LE but on
BE guest gets 0. Fix it up.

Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
Tested-by: Alexander Graf <agraf at suse.de>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
 drivers/vhost/net.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index f82a739..3c4dcc3d9 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -379,7 +379,8 @@ static void handle_rx(struct vhost_net *net)
 		.hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE
 	size_t total_len = 0;
-	int err, headcount, mergeable;
+	int err, mergeable;
+	s16 headcount;
 	size_t vhost_hlen, sock_hlen;
 	size_t vhost_len, sock_len;
 	/* TODO: check that we are running from vhost_worker? */

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