[PATCH for stable 3.15 4/4 v2] xen-netback: Fix pointer incrementation to avoid incorrect logging

[Zoltan Kiss]

Due to this pointer is increased prematurely, the error log contains rubbish.

Signed-off-by: Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>
Reported-by: Armin Zentai <armin.zentai@xxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 7a36ecf..36fb4ff 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1020,7 +1020,6 @@ static int xenvif_tx_check_gop(struct xenvif *vif,
 
 	/* Check status of header. */
 	err = (*gopp_copy)->status;
-	(*gopp_copy)++;
 	if (unlikely(err)) {
 		if (net_ratelimit())
 			netdev_dbg(vif->dev,
@@ -1030,6 +1029,7 @@ static int xenvif_tx_check_gop(struct xenvif *vif,
 				   (*gopp_copy)->source.u.ref);
 		xenvif_idx_release(vif, first_pending_idx, XEN_NETIF_RSP_ERROR);
 	}
+	(*gopp_copy)++;
 
 check_frags:
 	for (i = 0; i < nr_frags; i++, gop_map++) {
--
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