Re: HDIO_DRIVE_CMD and hdparm

>   - SCSI doesn't handle HDIO_DRIVE_CMD(null), and returns EINVAL
>     => fine for hdparm
>   - If a block device doesn't support the ioctl, blkdev_driver_ioctl() returns
>     ENOTTY
>     => hdparm error message

Those are both correct
	-ENOTTY 		I don't know this ioctl
	-EINVAL			I know this ioctl, usage wrong
	0			Hey it worked

	ENOIOCTLCMD		Internal (not user exposed)
				for fallthrough

	ENOSYS			CD-ROM being weird.

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