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_optidma.c b/drivers/ata/pata_optidma.c
index f89bdfde16d0..f8234d7fd825 100644
--- a/drivers/ata/pata_optidma.c
+++ b/drivers/ata/pata_optidma.c
@@ -340,8 +340,8 @@ static int optidma_set_mode(struct ata_port *ap, struct ata_device **r_failed)
                 pci_read_config_byte(pdev, 0x43, &r);
 
                 r &= (0x0F << nybble);
-                r |= (optidma_make_bits43(&ap->device[0]) +
-                     (optidma_make_bits43(&ap->device[0]) << 2)) << nybble;
+                r |= (optidma_make_bits43(&ap->link.device[0]) +
+                     (optidma_make_bits43(&ap->link.device[0]) << 2)) << nybble;
                 pci_write_config_byte(pdev, 0x43, r);
         }
         return rc;