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/pata_pcmcia.c b/drivers/ata/pata_pcmcia.c
index 0f2b027624d6..890f649ddcce 100644
--- a/drivers/ata/pata_pcmcia.c
+++ b/drivers/ata/pata_pcmcia.c
@@ -67,8 +67,8 @@ struct ata_pcmcia_info {
 
 static int pcmcia_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
 {
-        struct ata_device *master = &ap->device[0];
-        struct ata_device *slave = &ap->device[1];
+        struct ata_device *master = &ap->link.device[0];
+        struct ata_device *slave = &ap->link.device[1];
 
         if (!ata_dev_enabled(master) || !ata_dev_enabled(slave))
                 return ata_do_set_mode(ap, r_failed_dev);