[PATCH 3.11 32/46] xen-netback: remove pointless clause from if statement

[Luis Henriques]

3.11.10.8 -stable review patch.  If anyone has any objections, please let me know.

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

From: Paul Durrant <Paul.Durrant at citrix.com>

commit 0576eddf24df716d8570ef8ca11452a9f98eaab2 upstream.

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 at citrix.com>
Cc: Ian Campbell <ian.campbell at citrix.com>
Cc: Wei Liu <wei.liu2 at citrix.com>
Cc: Sander Eikelenboom <linux at eikelenboom.it>
Reported-By: Sander Eikelenboom <linux at eikelenboom.it>
Tested-By: Sander Eikelenboom <linux at eikelenboom.it>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/xen-netback/netback.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index ac55997..3335983 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -354,8 +354,8 @@ static bool start_new_rx_buffer(int offset, unsigned long size, int head)
 	 * 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;
-- 
1.9.1