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, 3 insertions, 3 deletions

diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index 25698cf0dce0..620d0675d18a 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -626,7 +626,7 @@ static void pdc_post_internal_cmd(struct ata_queued_cmd *qc)
 static void pdc_error_intr(struct ata_port *ap, struct ata_queued_cmd *qc,
                            u32 port_status, u32 err_mask)
 {
-        struct ata_eh_info *ehi = &ap->eh_info;
+        struct ata_eh_info *ehi = &ap->link.eh_info;
         unsigned int ac_err_mask = 0;
 
         ata_ehi_clear_desc(ehi);
@@ -773,7 +773,7 @@ static irqreturn_t pdc_interrupt (int irq, void *dev_instance)
                 tmp = hotplug_status & (0x11 << ata_no);
                 if (tmp && ap &&
                     !(ap->flags & ATA_FLAG_DISABLED)) {
-                        struct ata_eh_info *ehi = &ap->eh_info;
+                        struct ata_eh_info *ehi = &ap->link.eh_info;
                         ata_ehi_clear_desc(ehi);
                         ata_ehi_hotplugged(ehi);
                         ata_ehi_push_desc(ehi, "hotplug_status %#x", tmp);
@@ -788,7 +788,7 @@ static irqreturn_t pdc_interrupt (int irq, void *dev_instance)
                     !(ap->flags & ATA_FLAG_DISABLED)) {
                         struct ata_queued_cmd *qc;
 
-                        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)))
                                 handled += pdc_host_intr(ap, qc);
                 }