libata: add qc_fill_rtf port operation
commit22183bf569c8600ff414ac25f23134044e0ef453
authorTejun Heo <htejun@gmail.com>
Mon, 7 Apr 2008 13:47:20 +0000 (7 22:47 +0900)
committerJeff Garzik <jgarzik@redhat.com>
Thu, 17 Apr 2008 19:44:23 +0000 (17 15:44 -0400)
tree1dea79cdbe439637477e1c4214b600b6823cb866
parent305d2a1ab137d11d573319c315748a87060fe82d
libata: add qc_fill_rtf port operation

On command completion, ata_qc_complete() directly called ops->tf_read
to fill qc->result_tf.  This patch adds ops->qc_fill_rtf to replace
hardcoded ops->tf_read usage.

ata_sff_qc_fill_rtf() which uses ops->tf_read to fill result_tf is
implemented and set in ata_base_port_ops and other ops tables which
don't inherit from ata_base_port_ops, so this patch doesn't introduce
any behavior change.

ops->qc_fill_rtf() is similar to ops->sff_tf_read() but can only be
called when a command finishes.  As some non-SFF controllers don't
have TF registers defined unless they're associated with in-flight
commands, this limited operation makes life easier for those drivers
and help lifting SFF assumptions from libata core layer.

Signed-off-by: Tejun Heo <htejun@gmail.com>
drivers/ata/libata-core.c
drivers/ata/libata-sff.c
drivers/ata/sata_sx4.c
drivers/scsi/ipr.c
drivers/scsi/libsas/sas_ata.c
include/linux/libata.h