[PATCH 3.13 49/65] xen-netback: remove pointless clause from if statement

From: Greg Kroah-Hartman
Date: Fri Apr 11 2014 - 12:36:18 EST


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

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

From: Paul Durrant <Paul.Durrant@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Reported-By: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Tested-By: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -203,8 +203,8 @@ 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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