libata-link: introduce ata_link
Introduce ata_link. It abstracts PHY and sits between ata_port and
ata_device. This new level of abstraction is necessary to support
SATA Port Multiplier, which basically adds a bunch of links (PHYs) to
a ATA host port. Fields related to command execution, spd_limit and
EH are per-link and thus moved to ata_link.
This patch only defines the host link. Multiple link handling will be
added later. Also, a lot of ap->link derefences are added but many of
them will be removed as each part is converted to deal directly with
ata_link instead of ata_port.
This patch introduces no behavior change.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/sata_qstor.c b/drivers/ata/sata_qstor.c
index 5e1dfdd..ef1ad69 100644
--- a/drivers/ata/sata_qstor.c
+++ b/drivers/ata/sata_qstor.c
@@ -404,7 +404,7 @@
struct qs_port_priv *pp = ap->private_data;
if (!pp || pp->state != qs_state_pkt)
continue;
- qc = ata_qc_from_tag(ap, ap->active_tag);
+ qc = ata_qc_from_tag(ap, ap->link.active_tag);
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
switch (sHST) {
case 0: /* successful CPB */
@@ -437,7 +437,7 @@
struct qs_port_priv *pp = ap->private_data;
if (!pp || pp->state != qs_state_mmio)
continue;
- qc = ata_qc_from_tag(ap, ap->active_tag);
+ qc = ata_qc_from_tag(ap, ap->link.active_tag);
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
/* check main status, clearing INTRQ */