dm: add two lockdep_assert_held() statements

Document the locking assumptions for the __bind() and __dm_suspend()
functions.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm.c

@@ -1648,6 +1648,8 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
 	struct request_queue *q = md->queue;
 	sector_t size;
 
+	lockdep_assert_held(&md->suspend_lock);
+
 	size = dm_table_get_size(t);
 
 	/*
@@ -2094,6 +2096,8 @@ static int __dm_suspend(struct mapped_device *md, struct dm_table *map,
 	bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG;
 	int r;
 
+	lockdep_assert_held(&md->suspend_lock);
+
 	/*
 	 * DMF_NOFLUSH_SUSPENDING must be set before presuspend.
 	 * This flag is cleared before dm_suspend returns.