libata: add support for ATA_16 on ATAPI
Add support for issuing ATA_16 passthru commands to ATAPI devices managed by libata. It requires the previous CDB length fix patch. A boot/module parameter, "atapi_passthru16=0" can be used to globally disable this feature, if ever desired. tj: restructured __ata_scsi_queuecmd() according to Jeff's suggestion. Signed-off-by: NMark Lord <liml@rtr.ca> Signed-off-by: NTejun Heo <htejun@gmail.com> Signed-off-by: NJeff Garzik <jeff@garzik.org>
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