linux-kernel - [PATCH 3.2 10/94] xen-netback: remove pointless clause from if statement

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Message-ID: <lsq.1398647481.479968699@decadent.org.uk>
Date:	Mon, 28 Apr 2014 02:11:21 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Wei Liu" <wei.liu2@...rix.com>,
	"Paul Durrant" <paul.durrant@...rix.com>,
	"Ian Campbell" <ian.campbell@...rix.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Sander Eikelenboom" <linux@...elenboom.it>
Subject: [PATCH 3.2 10/94] xen-netback: remove pointless clause from if
 statement

3.2.58-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Paul Durrant <Paul.Durrant@...rix.com>

[ Upstream commit 0576eddf24df716d8570ef8ca11452a9f98eaab2 ]

This patch removes a test in start_new_rx_buffer() that checks whether
a copy operation is less than MAX_BUFFER_OFFSET in length, since
MAX_BUFFER_OFFSET is defined to be PAGE_SIZE and the only caller of
start_new_rx_buffer() already limits copy operations to PAGE_SIZE or less.

Signed-off-by: Paul Durrant <paul.durrant@...rix.com>
Cc: Ian Campbell <ian.campbell@...rix.com>
Cc: Wei Liu <wei.liu2@...rix.com>
Cc: Sander Eikelenboom <linux@...elenboom.it>
Reported-By: Sander Eikelenboom <linux@...elenboom.it>
Tested-By: Sander Eikelenboom <linux@...elenboom.it>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/xen-netback/netback.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -346,8 +346,8 @@ static bool start_new_rx_buffer(int offs
 	 * into multiple copies tend to give large frags their
 	 * own buffers as before.
 	 */
-	if ((offset + size > MAX_BUFFER_OFFSET) &&
-	    (size <= MAX_BUFFER_OFFSET) && offset && !head)
+	BUG_ON(size > MAX_BUFFER_OFFSET);
+	if ((offset + size > MAX_BUFFER_OFFSET) && offset && !head)
 		return true;
 
 	return false;

--
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