[PATCH v4] bcache:remove a superfluous check in register_bcache

[Yi Li]

There have no reassign the bdev after check It is IS_ERR.
the double check !IS_ERR(bdev) is superfluous.

After commit 4e7b5671c6a8 ("block: remove i_bdev"),
"Switch the block device lookup interfaces to directly work with a dev_t
so that struct block_device references are only acquired by the
blkdev_get variants (and the blk-cgroup special case).  This means that
we now don't need an extra reference in the inode and can generally
simplify handling of struct block_device to keep the lookups contained
in the core block layer code."

so after lookup_bdev call, there no need to do bdput.

remove a superfluous check the bdev & don't call bdput after lookup_bdev.

Fixes: 4e7b5671c6a8("block: remove i_bdev")
Signed-off-by: Yi Li <y...@winhong.com>
---
 drivers/md/bcache/super.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 0e06d721cd8e..a4752ac410dc 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -2535,8 +2535,6 @@ static ssize_t register_bcache(struct kobject *k, struct 
kobj_attribute *attr,
                        else
                                err = "device busy";
                        mutex_unlock(&bch_register_lock);
-                       if (!IS_ERR(bdev))
-                               bdput(bdev);
                        if (attr == &ksysfs_register_quiet)
                                goto done;
                }
-- 
2.25.3