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

Greg KH
2009-07-01T01:08:56Z

[-- Attachment #1: md-raid5-add-missing-call-to-schedule-after-prepare_to_wait.patch --]
[-- Type: text/plain, Size: 1012 bytes --]

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

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

From: Dan Williams <dan.j.williams@intel.com>

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@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
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;
}
}