Commit f4370781 authored Jul 10, 2006 by NeilBrown Committed by Linus Torvalds Jul 10, 2006

[PATCH] md: possible fix for unplug problem



I have reports of a problem with raid5 which turns out to be because the raid5
device gets stuck in a 'plugged' state.  This shouldn't be able to happen as
3msec after it gets plugged it should get unplugged.  However it happens
none-the-less.  This patch fixes the problem and is a reasonable thing to do,
though it might hurt performance slightly in some cases.

Until I can find the real problem, we should probably have this workaround in
place.

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

parent 894673ee

drivers/md/raid5.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -270,7 +270,7 @@ static struct stripe_head get_active_stripe(raid5_conf_t conf, sector_t sector
		< (conf->max_nr_stripes *3/4)
		\|\| !conf->inactive_blocked),
		conf->device_lock,
		unplug_slaves(conf->mddev)
		raid5_unplug_device(conf->mddev->queue)
		);
		conf->inactive_blocked = 0;
		} else