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, 9 insertions, 4 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 620da7be07b7..d758168ee45d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -363,6 +363,9 @@ struct ata_host {
         void                    *private_data;
         const struct ata_port_operations *ops;
         unsigned long           flags;
+#ifdef CONFIG_ATA_ACPI
+        acpi_handle             acpi_handle;
+#endif
         struct ata_port         *simplex_claimed;       /* channel owning the DMA */
         struct ata_port         *ports[0];
 };
@@ -429,6 +432,9 @@ struct ata_device {
         unsigned int            devno;          /* 0 or 1 */
         unsigned long           flags;          /* ATA_DFLAG_xxx */
         struct scsi_device      *sdev;          /* attached SCSI device */
+#ifdef CONFIG_ATA_ACPI
+        acpi_handle             acpi_handle;
+#endif
         /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
         u64                     n_sectors;      /* size of device, if ATA */
         unsigned int            class;          /* ATA_DEV_xxx */
@@ -457,10 +463,6 @@ struct ata_device {
         struct ata_ering        ering;
         int                     spdn_cnt;
         unsigned int            horkage;        /* List of broken features */
-#ifdef CONFIG_ATA_ACPI
-        /* ACPI objects info */
-        acpi_handle obj_handle;
-#endif
 };
 
 /* Offset into struct ata_device.  Fields above it are maintained
@@ -549,6 +551,9 @@ struct ata_port {
 
         void                    *private_data;
 
+#ifdef CONFIG_ATA_ACPI
+        acpi_handle             acpi_handle;
+#endif
         u8                      sector_buf[ATA_SECT_SIZE]; /* owned by EH */
 };