[Xen-changelog] Fix gnttab bug in blkfront.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 7a30b587387fb07fd37a0470f4ebed7c9e7c06f2
# Parent  fb5de385a9ee62e1e3232dcd3cf2021067b8e3eb
Fix gnttab bug in blkfront.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r fb5de385a9ee -r 7a30b587387f 
linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c
--- a/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c      Wed Jul 27 
23:15:15 2005
+++ b/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c      Thu Jul 28 
09:10:05 2005
@@ -1428,8 +1428,9 @@
     int i;
 
 #ifdef CONFIG_XEN_BLKDEV_GRANT
-    if ( 0 > gnttab_alloc_grant_references( MAXIMUM_OUTSTANDING_BLOCK_REQS,
-                                            &gref_head, &gref_terminal ))
+    /* A grant for every ring slot, plus one for the ring itself. */
+    if ( 0 > gnttab_alloc_grant_references(MAXIMUM_OUTSTANDING_BLOCK_REQS + 1,
+                                           &gref_head, &gref_terminal) )
         return 1;
     printk(KERN_ALERT "Blkif frontend is using grant tables.\n");
 #endif

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