linux-kernel - Re: [PATCH v3 2/3] block: convert to device_add

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Date:	Mon, 20 Jun 2016 15:33:49 +0200
From:	Bart Van Assche <bart.vanassche@...disk.com>
To:	Dan Williams <dan.j.williams@...el.com>,
	<linux-block@...r.kernel.org>
CC:	James Bottomley <James.Bottomley@...senpartnership.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	<axboe@...com>, "Michael S. Tsirkin" <mst@...hat.com>,
	<linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Keith Busch <keith.busch@...el.com>,
	<linux-nvdimm@...ts.01.org>,
	Johannes Thumshirn <jthumshirn@...e.de>,
	"Ross Zwisler" <ross.zwisler@...ux.intel.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v3 2/3] block: convert to device_add_disk()

On 06/17/2016 06:34 PM, Dan Williams wrote:
> diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
> index ef6b4d960bad..4e7cb5df8e43 100644
> --- a/arch/um/drivers/ubd_kern.c
> +++ b/arch/um/drivers/ubd_kern.c
> @@ -823,12 +823,11 @@ static int ubd_disk_register(int major, u64 size, int unit,
>  		ubd_devs[unit].pdev.dev.release = ubd_device_release;
>  		dev_set_drvdata(&ubd_devs[unit].pdev.dev, &ubd_devs[unit]);
>  		platform_device_register(&ubd_devs[unit].pdev);
> -		disk->driverfs_dev = &ubd_devs[unit].pdev.dev;
>  	}
>
>  	disk->private_data = &ubd_devs[unit];
>  	disk->queue = ubd_devs[unit].queue;
> -	add_disk(disk);
> +	device_add_disk(&ubd_devs[unit].pdev.dev, disk);
>
>  	*disk_out = disk;
>  	return 0;

Have you reviewed this patch yourself? I think the above change is an 
unintended behavior change.

Bart.