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, 1 insertions, 1 deletions

diff --git a/drivers/ata/sata_vsc.c b/drivers/ata/sata_vsc.c
index 1920915dfa2..9586b8b51ce 100644
--- a/drivers/ata/sata_vsc.c
+++ b/drivers/ata/sata_vsc.c
@@ -240,7 +240,7 @@ static void vsc_port_intr(u8 port_status, struct ata_port *ap)
                 return;
         }
 
-        qc = ata_qc_from_tag(ap, ap->active_tag);
+        qc = ata_qc_from_tag(ap, ap->link.active_tag);
         if (qc && likely(!(qc->tf.flags & ATA_TFLAG_POLLING)))
                 handled = ata_host_intr(ap, qc);