> - 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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