md/raid5: add missing call to schedule() after prepare_to_wait()
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.
Cc: <stable@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 8f2e374..59e29c2 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3695,6 +3695,7 @@
spin_unlock_irq(&conf->device_lock);
if (must_retry) {
release_stripe(sh);
+ schedule();
goto retry;
}
}