From: NeilBrown 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 Signed-off-by: Andrew Morton --- drivers/md/raid5.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN drivers/md/raid5.c~md-possible-fix-for-unplug-problem drivers/md/raid5.c --- a/drivers/md/raid5.c~md-possible-fix-for-unplug-problem +++ a/drivers/md/raid5.c @@ -271,7 +271,7 @@ static struct stripe_head *get_active_st < (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 _