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

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Message-Id: <20210928055716.172951-2-sashal@kernel.org>
Date:   Tue, 28 Sep 2021 01:57:08 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jan Beulich <jbeulich@...e.com>, Paul Durrant <paul@....org>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, wei.liu@...nel.org,
        kuba@...nel.org, xen-devel@...ts.xenproject.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 02/10] xen-netback: correct success/error reporting for the SKB-with-fraglist case

From: Jan Beulich <jbeulich@...e.com>

[ 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@...e.com>
Reviewed-by: Paul Durrant <paul@....org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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