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Re: [PATCH 06/15] genhd: Add return code to device_add_disk

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On Wed, 17 Aug 2016 15:15:06 +0800
Fam Zheng <famz@redhat.com> wrote:

> @@ -613,10 +614,8 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
>  	disk->flags |= GENHD_FL_UP;
> 
>  	retval = blk_alloc_devt(&disk->part0, &devt);
> -	if (retval) {
> -		WARN_ON(1);
> -		return;
> -	}
> +	if (retval)
> +		goto fail;
>  	disk_to_dev(disk)->devt = devt;
> 
>  	/* ->major and ->first_minor aren't supposed to be
> @@ -625,16 +624,26 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
>  	disk->major = MAJOR(devt);
>  	disk->first_minor = MINOR(devt);
> 
> -	disk_alloc_events(disk);
> +	retval = disk_alloc_events(disk);
> +	if (retval)
> +		goto fail;
> 
>  	/* Register BDI before referencing it from bdev */
>  	bdi = &disk->queue->backing_dev_info;
> -	bdi_register_owner(bdi, disk_to_dev(disk));
> +	retval = bdi_register_owner(bdi, disk_to_dev(disk));
> +	if (retval)
> +		goto fail;
> 
> -	blk_register_region(disk_devt(disk), disk->minors, NULL,
> -			    exact_match, exact_lock, disk);
> -	register_disk(parent, disk);
> -	blk_register_queue(disk);
> +	retval = blk_register_region(disk_devt(disk), disk->minors, NULL,
> +				     exact_match, exact_lock, disk);
> +	if (retval)
> +		goto fail;
> +	retval = register_disk(parent, disk);
> +	if (retval)
> +		goto fail;
> +	retval = blk_register_queue(disk);
> +	if (retval)
> +		goto fail;
> 
>  	/*
>  	 * Take an extra ref on queue which will be put on disk_release()
> @@ -644,10 +653,20 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
> 
>  	retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj,
>  				   "bdi");
> +	if (retval)
> +		goto fail;
> +
> +	retval = disk_add_events(disk);
> +	if (retval)
> +		goto fail;
> +
> +	retval = blk_integrity_add(disk);
> +	if (retval)
> +		goto fail;
> +	return 0;
> +fail:
>  	WARN_ON(retval);
> -
> -	disk_add_events(disk);
> -	blk_integrity_add(disk);
> +	return retval;
>  }

Noticed this when trying to figure out whether the error handling in
virtio_blk was correct:

Shouldn't you try to cleanup/rewind so that any structures are in a
sane state after failure? The caller doesn't know where device_add_disk
failed, and calling del_gendisk unconditionally like virtio_blk does is
probably not the right thing to do (at the very least, I don't think
unregistering a device that has not been registered is likely to work).

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[PATCH 00/15] Fix issue with KOBJ_ADD uevent versus disk attributes Fam Zheng <famz@redhat.com> - 2016-08-17 09:20 +0200
  [PATCH 04/15] block: Return error from blk_integrity_add Fam Zheng <famz@redhat.com> - 2016-08-17 09:20 +0200
  [PATCH 03/15] genhd: Return error from blk_register_region Fam Zheng <famz@redhat.com> - 2016-08-17 09:20 +0200
  [PATCH 12/15] mtip: Pass attribute group to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 09:20 +0200
  [PATCH 02/15] genhd: Return error from register_disk() Fam Zheng <famz@redhat.com> - 2016-08-17 09:20 +0200
  [PATCH 01/15] disk: Drop add_disk in favor of device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 09:20 +0200
  [PATCH 14/15] axonram: Pass attribute group to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 09:20 +0200
  [PATCH 13/15] aoeblk: Pass attribute group to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 09:20 +0200
  [PATCH 15/15] block: Add FIXME comment to handle device_add_disk error Fam Zheng <famz@redhat.com> - 2016-08-17 09:20 +0200
    Re: [PATCH 15/15] block: Add FIXME comment to handle device_add_disk  error Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-08-18 04:40 +0200
  [PATCH 10/15] mtd: Pass attribute group to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 09:30 +0200
  [PATCH 08/15] nvme: Pass attribute group to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 09:30 +0200
  [PATCH 06/15] genhd: Add return code to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 09:30 +0200
    Re: [PATCH 06/15] genhd: Add return code to device_add_disk Cornelia Huck <cornelia.huck@de.ibm.com> - 2016-08-17 10:50 +0200
      Re: [PATCH 06/15] genhd: Add return code to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 11:00 +0200
        Re: [PATCH 06/15] genhd: Add return code to device_add_disk Cornelia Huck <cornelia.huck@de.ibm.com> - 2016-08-17 11:10 +0200
          Re: [PATCH 06/15] genhd: Add return code to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 11:30 +0200
            Re: [PATCH 06/15] genhd: Add return code to device_add_disk Ed Cashin <ed.cashin@acm.org> - 2016-08-18 03:40 +0200
  [PATCH 11/15] zram: Pass attribute group to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 09:30 +0200
    Re: [PATCH 11/15] zram: Pass attribute group to device_add_disk Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-08-18 04:00 +0200
      Re: [PATCH 11/15] zram: Pass attribute group to device_add_disk Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2016-08-18 04:10 +0200
  [PATCH 09/15] virtio-blk: Pass attribute group to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 09:30 +0200
  [PATCH 05/15] genhd: Return error from disk_{add,alloc}_events Fam Zheng <famz@redhat.com> - 2016-08-17 09:30 +0200
  [PATCH 07/15] genhd: Add attribute group parameter to device_add_disk Fam Zheng <famz@redhat.com> - 2016-08-17 09:30 +0200

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