[PATCH AUTOSEL 4.19 02/10] xen-netback: correct success/error reporting for the SKB-with-fraglist case

[Sasha Levin <sashal@xxxxxxxxxx>]

From: Jan Beulich <jbeulich@xxxxxxxx>

[ Upstream commit 3ede7f84c7c21f93c5eac611d60eba3f2c765e0f ]

When re-entering the main loop of xenvif_tx_check_gop() a 2nd time, the
special considerations for the head of the SKB no longer apply. Don't
mistakenly report ERROR to the frontend for the first entry in the list,
even if - from all I can tell - this shouldn't matter much as the overall
transmit will need to be considered failed anyway.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Paul Durrant <paul@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/xen-netback/netback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/xen-netback/netback.c 
b/drivers/net/xen-netback/netback.c
index 41bdfb684d46..4d0d5501ca56 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -492,7 +492,7 @@ static int xenvif_tx_check_gop(struct xenvif_queue *queue,
                                 * the header's copy failed, and they are
                                 * sharing a slot, send an error
                                 */
-                               if (i == 0 && sharedslot)
+                               if (i == 0 && !first_shinfo && sharedslot)
                                        xenvif_idx_release(queue, pending_idx,
                                                           XEN_NETIF_RSP_ERROR);
                                else
-- 
2.33.0