libata: update libata core layer to use devres

Update libata core layer to use devres.

* ata_device_add() acquires all resources in managed mode.

* ata_host is allocated as devres associated with ata_host_release.

* Port attached status is handled as devres associated with
  ata_host_attach_release().

* Initialization failure and host removal is handedl by releasing
  devres group.

* Except for ata_scsi_release() removal, LLD interface remains the
  same.  Some functions use hacky is_managed test to support both
  managed and unmanaged devices.  These will go away once all LLDs are
  updated to use devres.

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

1 files changed, 4 insertions, 17 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 649dfa57e51c..d72568392e6c 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1784,37 +1784,24 @@ err_out:
         return rc;
 }
 
-static void ahci_remove_one (struct pci_dev *pdev)
+static void ahci_remove_one(struct pci_dev *pdev)
 {
         struct device *dev = pci_dev_to_dev(pdev);
         struct ata_host *host = dev_get_drvdata(dev);
         struct ahci_host_priv *hpriv = host->private_data;
-        unsigned int i;
-        int have_msi;
 
-        ata_host_detach(host);
+        ata_host_remove(host);
 
-        have_msi = hpriv->flags & AHCI_FLAG_MSI;
-        free_irq(host->irq, host);
-
-        for (i = 0; i < host->n_ports; i++) {
-                struct ata_port *ap = host->ports[i];
-
-                ata_scsi_release(ap->scsi_host);
-                scsi_host_put(ap->scsi_host);
-        }
-
-        kfree(hpriv);
         pci_iounmap(pdev, host->mmio_base);
-        kfree(host);
 
-        if (have_msi)
+        if (hpriv->flags & AHCI_FLAG_MSI)
                 pci_disable_msi(pdev);
         else
                 pci_intx(pdev, 0);
         pci_release_regions(pdev);
         pci_disable_device(pdev);
         dev_set_drvdata(dev, NULL);
+        kfree(hpriv);
 }
 
 static int __init ahci_init(void)