netback: correct netbk_tx_err to handle wrap around.

[ Upstream commit b9149729ebdcfce63f853aa54a404c6a8f6ebbf3 ]

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Jan Beulich <JBeulich@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index a14b3a2a2f1d4db7e68d1f48a1fd0aa99366b0d4..b802bb31213cce866d427b67beab7731da060324 100644 (file)
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -852,7 +852,7 @@ static void netbk_tx_err(struct xenvif *vif,
 
        do {
                make_tx_response(vif, txp, XEN_NETIF_RSP_ERROR);
-               if (cons >= end)
+               if (cons == end)
                        break;
                txp = RING_GET_REQUEST(&vif->tx, cons++);
        } while (1);