From: Andrew Morton <akpm@osdl.org>

Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/md/md.c |    2 ++
 1 file changed, 2 insertions(+)

diff -puN drivers/md/md.c~md-oops-workaround drivers/md/md.c
--- a/drivers/md/md.c~md-oops-workaround
+++ a/drivers/md/md.c
@@ -4586,6 +4586,8 @@ void md_error(mddev_t *mddev, mdk_rdev_t
 		__builtin_return_address(0),__builtin_return_address(1),
 		__builtin_return_address(2),__builtin_return_address(3));
 */
+	if (!mddev->pers)
+		return;
 	if (!mddev->pers->error_handler)
 		return;
 	mddev->pers->error_handler(mddev,rdev);
_