libata-acpi: implement ata_acpi_associate()

* Add acpi_handle to ata_host and ata_port.  Rename
  ata_device->obj_handle to ->acpi_handle and move it above such that
  it doesn't get cleared on reconfiguration.

* Replace ACPI node association which ata_acpi_associate() which is
  called once during host initialization.  Unlike the previous
  implementation, ata_acpi_associate() uses ATA_FLAG_ACPI_SATA to
  choose between IDE or SATA ACPI hierarchy and uses simple child look
  up instead of recursive walk to match the nodes.  This is way safer
  and simpler.  Please read the following message for more info.

  http://article.gmane.org/gmane.linux.ide/17554

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 981b397cb46b..5a46cdebc588 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6293,6 +6293,9 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
         if (rc)
                 return rc;
 
+        /* associate with ACPI nodes */
+        ata_acpi_associate(host);
+
         /* set cable, sata_spd_limit and report */
         for (i = 0; i < host->n_ports; i++) {
                 struct ata_port *ap = host->ports[i];