Re: HDIO_DRIVE_CMD and hdparm

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Alan Cox wrote:
  - 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

Exactly.
I'll have hdparm-7.4 not complain on ENOTTY as well.

-ml
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