dm: fix zoned locking imbalance due to needless check in clone_endio

After the commit ca522482 ("dm: pass NULL bdev to bio_alloc_clone"),
clone_endio() only calls dm_zone_endio() when DM targets remap the
clone bio's bdev to something other than the md->disk->part0 default.

However, if a DM target (e.g. dm-crypt) stacked ontop of a dm-zoned
does not remap the clone bio using bio_set_dev() then dm_zone_endio()
is not called at completion of the bios and zone locks are not
properly unlocked. This triggers a hang, in dm_zone_map_bio(), when
blktests block/004 is run for dm-crypt on zoned block devices. To
avoid the hang, simply remove the clone_endio() check that verifies
the target remapped the clone bio to a device other than the default.

Fixes: ca522482 ("dm: pass NULL bdev to bio_alloc_clone")
Reported-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

drivers/md/dm.c

@@ -1016,22 +1016,18 @@ static void clone_endio(struct bio *bio)
 	struct dm_io *io = tio->io;
 	struct mapped_device *md = io->md;
 
-	if (likely(bio->bi_bdev != md->disk->part0)) {
-		struct request_queue *q = bdev_get_queue(bio->bi_bdev);
-
 	if (unlikely(error == BLK_STS_TARGET)) {
 		if (bio_op(bio) == REQ_OP_DISCARD &&
 		    !bdev_max_discard_sectors(bio->bi_bdev))
 			disable_discard(md);
 		else if (bio_op(bio) == REQ_OP_WRITE_ZEROES &&
-				 !q->limits.max_write_zeroes_sectors)
+			 !bdev_write_zeroes_sectors(bio->bi_bdev))
 			disable_write_zeroes(md);
 	}
 
 	if (static_branch_unlikely(&zoned_enabled) &&
-		    unlikely(blk_queue_is_zoned(q)))
+	    unlikely(blk_queue_is_zoned(bdev_get_queue(bio->bi_bdev))))
 		dm_zone_endio(io, bio);
-	}
 
 	if (endio) {
 		int r = endio(ti, bio, &error);