From: Chen Gang <gang.chen.5i5j@gmail.com>
Date: Tue, 26 Aug 2014 15:38:44 +0000 (+0800)
Subject: xen/grant-table: refactor error cleanup in grow_gnttab_list()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=46e3626adb86be2ff1321d26107cb75df07a7f4e;p=linux-beck.git

xen/grant-table: refactor error cleanup in grow_gnttab_list()

The cleanup loop in grow_gnttab_list() is safe from the underflow of
the unsigned 'i' since nr_glist_frames is >= 1, but refactor it
anyway.

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
---

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index c254ae036f18..7786291ba229 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -592,7 +592,7 @@ static int grow_gnttab_list(unsigned int more_frames)
 	return 0;
 
 grow_nomem:
-	for ( ; i >= nr_glist_frames; i--)
+	while (i-- > nr_glist_frames)
 		free_page((unsigned long) gnttab_list[i]);
 	return -ENOMEM;
 }