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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Jan Beulich <jbeulich@suse.com>,
        Paul Durrant <paul@xen.org>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 02/10] xen-netback: correct success/error reporting for the SKB-with-fraglist case
Date:   Fri,  8 Oct 2021 13:27:43 +0200
Message-Id: <20211008112714.526377516@linuxfoundation.org>
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From: Jan Beulich <jbeulich@suse.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@suse.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.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 ad555a9a3eca..e1d6dbb4b770 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -492,7 +492,7 @@ check_frags:
 				 * 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