[patch 076/108] md/raid5: add missing call to schedule() after prepare_to_wait()

[Greg KH]

2.6.30-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Dan Williams <dan.j.williams@xxxxxxxxx>

commit 7a3ab908948b6296ee7e81d42f7c176361c51975 upstream.

In the unlikely event that reshape progresses past the current request
while it is waiting for a stripe we need to schedule() before retrying
for 2 reasons:
1/ Prevent list corruption from duplicated list_add() calls without
   intervening list_del().
2/ Give the reshape code a chance to make some progress to resolve the
   conflict.

Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/md/raid5.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3696,6 +3696,7 @@ static int make_request(struct request_q
 				spin_unlock_irq(&conf->device_lock);
 				if (must_retry) {
 					release_stripe(sh);
+					schedule();
 					goto retry;
 				}
 			}


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