tree ee56665588e6be4257fd7ac2d787e00ad6f2bb7a
parent dce30ca9e3b676fb288c33c1f4725a0621361185
author zhengbin <zhengbin13@huawei.com> 1550669225 +0800
committer Jens Axboe <axboe@kernel.dk> 1551387696 -0700

block: fix NULL pointer dereference in register_disk

If __device_add_disk-->bdi_register_owner-->bdi_register-->
bdi_register_va-->device_create_vargs fails, bdi->dev is still
NULL, __device_add_disk-->register_disk will visit bdi->dev->kobj.
This patch fixes that.

Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>