From: http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/5012c470f875
# HG changeset 740 patch
# User Keir Fraser <keir.fraser@citrix.com>
# Date 1227697833 0
# Node ID 5012c470f8757e97c2e0f7eccfafcb1e2367443e
# Parent  f236d7def9944909bf40015ff4a08817b0803ed9
Subject: blkback, blktap: Fix potential resource leak.
Patch-mainline: obsolete

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
Acked-by: jbeulich@novell.com

Index: head-2008-12-01/drivers/xen/blkback/blkback.c
===================================================================
--- head-2008-12-01.orig/drivers/xen/blkback/blkback.c	2008-11-10 11:44:21.000000000 +0100
+++ head-2008-12-01/drivers/xen/blkback/blkback.c	2008-12-01 11:21:10.000000000 +0100
@@ -317,14 +317,14 @@ static int do_block_io_op(blkif_t *blkif
 		if (RING_REQUEST_CONS_OVERFLOW(&blk_rings->common, rc))
 			break;
 
-		pending_req = alloc_req();
-		if (NULL == pending_req) {
-			blkif->st_oo_req++;
+		if (kthread_should_stop()) {
 			more_to_do = 1;
 			break;
 		}
 
-		if (kthread_should_stop()) {
+		pending_req = alloc_req();
+		if (NULL == pending_req) {
+			blkif->st_oo_req++;
 			more_to_do = 1;
 			break;
 		}
Index: head-2008-12-01/drivers/xen/blktap/blktap.c
===================================================================
--- head-2008-12-01.orig/drivers/xen/blktap/blktap.c	2008-11-10 11:44:21.000000000 +0100
+++ head-2008-12-01/drivers/xen/blktap/blktap.c	2008-12-01 11:21:10.000000000 +0100
@@ -1286,14 +1286,14 @@ static int do_block_io_op(blkif_t *blkif
 			break;		
 		}
 
-		pending_req = alloc_req();
-		if (NULL == pending_req) {
-			blkif->st_oo_req++;
+		if (kthread_should_stop()) {
 			more_to_do = 1;
 			break;
 		}
 
-		if (kthread_should_stop()) {
+		pending_req = alloc_req();
+		if (NULL == pending_req) {
+			blkif->st_oo_req++;
 			more_to_do = 1;
 			break;
 		}