[PATCH] md: define and use safe_put_page for md
md sometimes call put_page on NULL pointers (treating it like kfree). This is
not safe, so define and use a 'safe_put_page' which checks for NULL.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/md/raid6main.c b/drivers/md/raid6main.c
index 950e5fa..06b32bd 100644
--- a/drivers/md/raid6main.c
+++ b/drivers/md/raid6main.c
@@ -2072,8 +2072,7 @@
abort:
if (conf) {
print_raid6_conf(conf);
- if (conf->spare_page)
- put_page(conf->spare_page);
+ safe_put_page(conf->spare_page);
kfree(conf->stripe_hashtbl);
kfree(conf);
}