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[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>
This commit is contained in:
NeilBrown 2006-07-10 04:44:14 -07:00 committed by Linus Torvalds
parent 894673ee61
commit f4370781d8
1 changed files with 1 additions and 1 deletions
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2
drivers/md/raid5.c
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@ -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