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>
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 5bddae1..2ecd329 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -5280,6 +5280,7 @@
.sff_tf_read = ipr_tf_read,
.qc_prep = ata_noop_qc_prep,
.qc_issue = ipr_qc_issue,
+ .qc_fill_rtf = ata_sff_qc_fill_rtf,
.port_start = ata_sas_port_start,
.port_stop = ata_sas_port_stop
};