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    SubjectRe: HDIO_DRIVE_CMD and hdparm
    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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