+	if (unlikely(conf->reshape_progress != MaxSector)) {
+		/* spinlock is needed as reshape_progress may be

Normal kernel style is to stat with a

		/*

line and to captalize the first word.  (also applies for a few other
comments).

+		if (must_retry) {
+			raid5_release_stripe(sh);
+			return STRIPE_SCHEDULE_AND_RETRY;

The raid5_release_stripe cleanup is duplicated a few times.  I think
using goto based unwinding would be hepful in this function.