xen-netback: remove pointless clause from if statement
authorPaul Durrant <Paul.Durrant@citrix.com>
Fri, 28 Mar 2014 11:39:05 +0000 (11:39 +0000)
committerDavid S. Miller <davem@davemloft.net>
Sat, 29 Mar 2014 22:50:34 +0000 (18:50 -0400)
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@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: Sander Eikelenboom <linux@eikelenboom.it>
Reported-By: Sander Eikelenboom <linux@eikelenboom.it>
Tested-By: Sander Eikelenboom <linux@eikelenboom.it>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/xen-netback/netback.c

index 438d0c09b7e6019b513f8e996f5549bb327463d2..72314c7998fcbe5ac2b001961d1d221946f6924b 100644 (file)
@@ -192,8 +192,8 @@ 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;