Tejun Heo wrote:
Mark Lord wrote:
..
So, to achieve ATA passthru capability for libata ATAPI,
we have to instead use the ATA_16 opcode: a 16-byte command.
SCSI normally disallows issuing 16-byte commands to 12-byte devices,
so special support has to be added for this.
I might have missed the discussion but can't we just set
host->max_cmd_len to 16 unconditionally?
Sure thing, if you and Jeff are happy with that, then lets do it.
I just kind of assumed that the complexity in ata_set_port_max_cmd_len()
was there for some kind of reason.
For example, I think all existing ATAPI drives only speak 12-byte packet
protocols, and so if we tell SCSI we're good for 16-byte, then won't the
SCSI layer suddenly start sending us READ_16 and the like?
Cheers
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