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dm: hold suspend_lock while suspending device during device deletion

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commit ab7c7bb6f4 upstream.

__dm_destroy() must take the suspend_lock so that its presuspend and
postsuspend calls do not race with an internal suspend.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikulas Patocka 2015-02-27 14:04:27 -05:00 committed by Greg Kroah-Hartman
parent 5e695f0be9
commit 6b031cd888
1 changed files with 6 additions and 0 deletions
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6
drivers/md/dm.c
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@ -2333,10 +2333,16 @@ static void __dm_destroy(struct mapped_device *md, bool wait)
set_bit(DMF_FREEING, &md->flags);
spin_unlock(&_minor_lock);
/*
* Take suspend_lock so that presuspend and postsuspend methods
* do not race with internal suspend.
*/
mutex_lock(&md->suspend_lock);
if (!dm_suspended_md(md)) {
dm_table_presuspend_targets(map);
dm_table_postsuspend_targets(map);
}
mutex_unlock(&md->suspend_lock);
/*
* Rare, but there may be I/O requests still going to complete,