netdev - [PATCH net] xen-netback: fix extra_info handling in xenvif_tx

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Date:	Thu, 12 May 2016 14:43:03 +0100
From:	Paul Durrant <paul.durrant@...rix.com>
To:	<xen-devel@...ts.xenproject.org>, <netdev@...r.kernel.org>
CC:	Paul Durrant <paul.durrant@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>
Subject: [PATCH net] xen-netback: fix extra_info handling in xenvif_tx_err()

Patch 562abd39 "xen-netback: support multiple extra info fragments
passed from frontend" contained a mistake which can result in an in-
correct number of responses being generated when handling errors
encountered when processing packets containing extra info fragments.
This patch fixes the problem.

Signed-off-by: Paul Durrant <paul.durrant@...rix.com>
Reported-by: Jan Beulich <JBeulich@...e.com>
Cc: Wei Liu <wei.liu2@...rix.com>
---
 drivers/net/xen-netback/netback.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index b42f260..4412a57 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -711,6 +711,7 @@ static void xenvif_tx_err(struct xenvif_queue *queue,
 		if (cons == end)
 			break;
 		RING_COPY_REQUEST(&queue->tx, cons++, txp);
+		extra_count = 0; /* only the first frag can have extras */
 	} while (1);
 	queue->tx.req_cons = cons;
 }
-- 
2.1.4