bdi: fix use-after-free for dev_name(bdi->dev)

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To: axboe@xxxxxxxxx
Subject: bdi: fix use-after-free for dev_name(bdi->dev)
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 16 Apr 2020 09:15:11 +0200
Cc: yuyufen@xxxxxxxxxx, tj@xxxxxxxxxx, jack@xxxxxxx, bvanassche@xxxxxxx, tytso@xxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx

Hi all,

the first three patches are my take on the proposal from Yufen Yu
to fix the use after free of the device name of the bdi device.

The rest is vaguely related cleanups.

Follow-Ups:
- Re: bdi: fix use-after-free for dev_name(bdi->dev)
  - From: Jens Axboe
- [PATCH 4/8] driver core: remove device_create_vargs
  - From: Christoph Hellwig
- [PATCH 3/8] bdi: add a ->dev_name field to struct backing_dev_info
  - From: Christoph Hellwig
- [PATCH 8/8] bdi: remove the name field in struct backing_dev_info
  - From: Christoph Hellwig
- [PATCH 7/8] bdi: simplify bdi_alloc
  - From: Christoph Hellwig
- [PATCH 6/8] bdi: remove bdi_register_owner
  - From: Christoph Hellwig
- [PATCH 5/8] bdi: unexport bdi_register_va
  - From: Christoph Hellwig
- [PATCH 2/8] bdi: use bdi_dev_name() to get device name
  - From: Christoph Hellwig
- [PATCH 1/8] bdi: move bdi_dev_name out of line
  - From: Christoph Hellwig

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