[PATCH 19/20] bcache: remove a superflous lookup_bdev all

[Christoph Hellwig]

Don't bother to call lookup_bdev for just a slightly different error
message without any functional change.

Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/md/bcache/super.c | 44 +--------------------------------------
 1 file changed, 1 insertion(+), 43 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index e5db2cdd114112..5c531ed7785280 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2380,40 +2380,6 @@ kobj_attribute_write(register,		register_bcache);
 kobj_attribute_write(register_quiet,	register_bcache);
 kobj_attribute_write(pendings_cleanup,	bch_pending_bdevs_cleanup);
 
-static bool bch_is_open_backing(struct block_device *bdev)
-{
-	struct cache_set *c, *tc;
-	struct cached_dev *dc, *t;
-
-	list_for_each_entry_safe(c, tc, &bch_cache_sets, list)
-		list_for_each_entry_safe(dc, t, &c->cached_devs, list)
-			if (dc->bdev == bdev)
-				return true;
-	list_for_each_entry_safe(dc, t, &uncached_devices, list)
-		if (dc->bdev == bdev)
-			return true;
-	return false;
-}
-
-static bool bch_is_open_cache(struct block_device *bdev)
-{
-	struct cache_set *c, *tc;
-
-	list_for_each_entry_safe(c, tc, &bch_cache_sets, list) {
-		struct cache *ca = c->cache;
-
-		if (ca->bdev == bdev)
-			return true;
-	}
-
-	return false;
-}
-
-static bool bch_is_open(struct block_device *bdev)
-{
-	return bch_is_open_cache(bdev) || bch_is_open_backing(bdev);
-}
-
 struct async_reg_args {
 	struct delayed_work reg_work;
 	char *path;
@@ -2535,15 +2501,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
 				  sb);
 	if (IS_ERR(bdev)) {
 		if (bdev == ERR_PTR(-EBUSY)) {
-			bdev = lookup_bdev(strim(path));
-			mutex_lock(&bch_register_lock);
-			if (!IS_ERR(bdev) && bch_is_open(bdev))
-				err = "device already registered";
-			else
-				err = "device busy";
-			mutex_unlock(&bch_register_lock);
-			if (!IS_ERR(bdev))
-				bdput(bdev);
+			err = "device busy";
 			if (attr == &ksysfs_register_quiet)
 				goto done;
 		}
-- 
2.29.2