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dm mpath: flush workqueues before suspend completes 

This patch stops the remaining dm-mpath activity during the suspend
sequence by flushing workqueues in postsuspend function.

The current dm-mpath target may not be quiet even after suspend completes
because some workqueues (e.g. device_handler's work, event handling)
are not flushed during the suspend sequence, even though suspended
devices/targets are supposed to be quiet in this state.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Kiyoshi Ueda 2009-12-10 23:52:19 +00:00 committed by Alasdair G Kergon
parent 7c6664114b
commit 6df400ab64
1 changed files with 15 additions and 4 deletions
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19
drivers/md/dm-mpath.c
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@ -885,13 +885,18 @@ static int multipath_ctr(struct dm_target *ti, unsigned int argc,
return r;
}
static void multipath_dtr(struct dm_target *ti)
static void flush_multipath_work(void)
{
struct multipath *m = (struct multipath *) ti->private;
flush_workqueue(kmpath_handlerd);
flush_workqueue(kmultipathd);
flush_scheduled_work();
}
static void multipath_dtr(struct dm_target *ti)
{
struct multipath *m = ti->private;
flush_multipath_work();
free_multipath(m);
}
@ -1261,6 +1266,11 @@ static void multipath_presuspend(struct dm_target *ti)
queue_if_no_path(m, 0, 1);
}
static void multipath_postsuspend(struct dm_target *ti)
{
flush_multipath_work();
}
/*
* Restore the queue_if_no_path setting.
*/
@ -1567,13 +1577,14 @@ out:
*---------------------------------------------------------------*/
static struct target_type multipath_target = {
.name = "multipath",
.version = {1, 1, 0},
.version = {1, 1, 1},
.module = THIS_MODULE,
.ctr = multipath_ctr,
.dtr = multipath_dtr,
.map_rq = multipath_map,
.rq_end_io = multipath_end_io,
.presuspend = multipath_presuspend,
.postsuspend = multipath_postsuspend,
.resume = multipath_resume,
.status = multipath_status,
.message = multipath_message,