[libata] Add ATA transport class

This is a scheleton for libata transport class.
All information is read only, exporting information from libata:
- ata_port class: one per ATA port
- ata_link class: one per ATA port or 15 for SATA Port Multiplier
- ata_device class: up to 2 for PATA link, usually one for SATA.

Signed-off-by: Gwendal Grignou <gwendal@google.com>
Reviewed-by: Grant Grundler <grundler@google.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 16 insertions, 2 deletions

diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c
index 224faabd7b7e..505470237d79 100644
--- a/drivers/ata/libata-pmp.c
+++ b/drivers/ata/libata-pmp.c
@@ -11,6 +11,7 @@
 #include <linux/libata.h>
 #include <linux/slab.h>
 #include "libata.h"
+#include "libata-transport.h"
 
 const struct ata_port_operations sata_pmp_port_ops = {
         .inherits               = &sata_port_ops,
@@ -312,10 +313,10 @@ static int sata_pmp_configure(struct ata_device *dev, int print_info)
         return rc;
 }
 
-static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
+static int sata_pmp_init_links (struct ata_port *ap, int nr_ports)
 {
         struct ata_link *pmp_link = ap->pmp_link;
-        int i;
+        int i, err;
 
         if (!pmp_link) {
                 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
@@ -327,6 +328,13 @@ static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
                         ata_link_init(ap, &pmp_link[i], i);
 
                 ap->pmp_link = pmp_link;
+
+                for (i = 0; i < SATA_PMP_MAX_PORTS; i++) {
+                        err = ata_tlink_add(&pmp_link[i]);
+                        if (err) {
+                                goto err_tlink;
+                        }
+                }
         }
 
         for (i = 0; i < nr_ports; i++) {
@@ -339,6 +347,12 @@ static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
         }
 
         return 0;
+  err_tlink:
+        while (--i >= 0)
+                ata_tlink_delete(&pmp_link[i]);
+        kfree(pmp_link);
+        ap->pmp_link = NULL;
+        return err;
 }
 
 static void sata_pmp_quirks(struct ata_port *ap)