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>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/ata/sata_qstor.c b/drivers/ata/sata_qstor.c
index 5e1dfdda698f..ef1ad69c26ed 100644
--- a/drivers/ata/sata_qstor.c
+++ b/drivers/ata/sata_qstor.c
@@ -404,7 +404,7 @@ static inline unsigned int qs_intr_pkt(struct ata_host *host)
                                 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 @@ static inline unsigned int qs_intr_mmio(struct ata_host *host)
                         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 */