> I do not wish to completely eliminate the current behavior, which passes > through all opcodes to the ATAPI device. You cannot guarantee that > ATA_16 is never used for a vendor-reserved opcode, for example. For 16 byte commands via SG_IO you know the command is 16 bytes long as the command length is passed in hdr->cmd_len which becomes rq->cmd_len. Is that not sufficient to avoid this ATA_16 test if you pass it on to the required functions ? Alan - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html