tree e5d50b2b91c17c6719b75bbd88ea5cbed4130304
parent a464189de350b050aa8f334bd4cc53ed406e56dd
author Tejun Heo <tj@kernel.org> 1225706469 +0900
committer Jeff Garzik <jgarzik@redhat.com> 1225778907 -0500

libata: implement ATA_HORKAGE_ATAPI_MOD16_DMA and apply it

libata always uses PIO for ATAPI commands when the number of bytes to
transfer isn't multiple of 16 but quantum DAT72 chokes on odd bytes
PIO transfers.  Implement a horkage to skip the mod16 check and apply
it to the quantum device.

This is reported by John Clark in the following thread.

  http://thread.gmane.org/gmane.linux.ide/34748

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: John Clark <clarkjc@runbox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>