Re: [PATCH 1/1] s390/dasd: remove ioctl_by_bdev from DASD driver

[Christoph Hellwig]

On Thu, May 07, 2020 at 05:43:40PM +0200, Stefan Haberland wrote:
> Not checked till now. I just was thinking about the basicapproach.
> 
> I could either check the block_device_operations like you suggested
> or I could verify that the gendisk pointer is already in our devmap
> and therefor belongs to the DASD driver.

The ops pointer check is simpler and cheaper, so I'd suggest that.