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, 21 insertions, 35 deletions

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 9bbc8749620a..21efe92a7135 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -1006,15 +1006,18 @@ static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
 int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
                       unsigned int n_ports)
 {
+        struct device *dev = &pdev->dev;
         struct ata_probe_ent *probe_ent = NULL;
         struct ata_port_info *port[2];
         u8 mask;
         unsigned int legacy_mode = 0;
-        int disable_dev_on_err = 1;
         int rc;
 
         DPRINTK("ENTER\n");
 
+        if (!devres_open_group(dev, NULL, GFP_KERNEL))
+                return -ENOMEM;
+
         BUG_ON(n_ports < 1 || n_ports > 2);
 
         port[0] = port_info[0];
@@ -1031,9 +1034,9 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
            boot for the primary video which is BIOS enabled
          */
 
-        rc = pci_enable_device(pdev);
+        rc = pcim_enable_device(pdev);
         if (rc)
-                return rc;
+                goto err_out;
 
         if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
                 u8 tmp8;
@@ -1049,7 +1052,8 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
                    left a device in compatibility mode */
                 if (legacy_mode) {
                         printk(KERN_ERR "ata: Compatibility mode ATA is not supported on this platform, skipping.\n");
-                        return -EOPNOTSUPP;
+                        rc = -EOPNOTSUPP;
+                        goto err_out;
                 }
 #endif
         }
@@ -1057,13 +1061,13 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
         if (!legacy_mode) {
                 rc = pci_request_regions(pdev, DRV_NAME);
                 if (rc) {
-                        disable_dev_on_err = 0;
+                        pcim_pin_device(pdev);
                         goto err_out;
                 }
         } else {
                 /* Deal with combined mode hack. This side of the logic all
                    goes away once the combined mode hack is killed in 2.6.21 */
-                if (!request_region(ATA_PRIMARY_CMD, 8, "libata")) {
+                if (!devm_request_region(dev, ATA_PRIMARY_CMD, 8, "libata")) {
                         struct resource *conflict, res;
                         res.start = ATA_PRIMARY_CMD;
                         res.end = ATA_PRIMARY_CMD + 8 - 1;
@@ -1073,7 +1077,7 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
                         if (!strcmp(conflict->name, "libata"))
                                 legacy_mode |= ATA_PORT_PRIMARY;
                         else {
-                                disable_dev_on_err = 0;
+                                pcim_pin_device(pdev);
                                 printk(KERN_WARNING "ata: 0x%0X IDE port busy\n" \
                                                     "ata: conflict with %s\n",
                                                     ATA_PRIMARY_CMD,
@@ -1082,7 +1086,7 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
                 } else
                         legacy_mode |= ATA_PORT_PRIMARY;
 
-                if (!request_region(ATA_SECONDARY_CMD, 8, "libata")) {
+                if (!devm_request_region(dev, ATA_SECONDARY_CMD, 8, "libata")) {
                         struct resource *conflict, res;
                         res.start = ATA_SECONDARY_CMD;
                         res.end = ATA_SECONDARY_CMD + 8 - 1;
@@ -1092,7 +1096,7 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
                         if (!strcmp(conflict->name, "libata"))
                                 legacy_mode |= ATA_PORT_SECONDARY;
                         else {
-                                disable_dev_on_err = 0;
+                                pcim_pin_device(pdev);
                                 printk(KERN_WARNING "ata: 0x%X IDE port busy\n" \
                                                     "ata: conflict with %s\n",
                                                     ATA_SECONDARY_CMD,
@@ -1112,16 +1116,16 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
         /* we have legacy mode, but all ports are unavailable */
         if (legacy_mode == (1 << 3)) {
                 rc = -EBUSY;
-                goto err_out_regions;
+                goto err_out;
         }
 
         /* TODO: If we get no DMA mask we should fall back to PIO */
         rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
         if (rc)
-                goto err_out_regions;
+                goto err_out;
         rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
         if (rc)
-                goto err_out_regions;
+                goto err_out;
 
         if (legacy_mode) {
                 probe_ent = ata_pci_init_legacy_port(pdev, port, legacy_mode);
@@ -1133,40 +1137,22 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
         }
         if (!probe_ent) {
                 rc = -ENOMEM;
-                goto err_out_regions;
+                goto err_out;
         }
 
         pci_set_master(pdev);
 
         if (!ata_device_add(probe_ent)) {
                 rc = -ENODEV;
-                goto err_out_ent;
+                goto err_out;
         }
 
-        kfree(probe_ent);
-
+        devm_kfree(dev, probe_ent);
+        devres_remove_group(dev, NULL);
         return 0;
 
-err_out_ent:
-        kfree(probe_ent);
-err_out_regions:
-        /* All this conditional stuff is needed for the combined mode hack
-           until 2.6.21 when it can go */
-        if (legacy_mode) {
-                pci_release_region(pdev, 4);
-                if (legacy_mode & ATA_PORT_PRIMARY) {
-                        release_region(ATA_PRIMARY_CMD, 8);
-                        pci_release_region(pdev, 1);
-                }
-                if (legacy_mode & ATA_PORT_SECONDARY) {
-                        release_region(ATA_SECONDARY_CMD, 8);
-                        pci_release_region(pdev, 3);
-                }
-        } else
-                pci_release_regions(pdev);
 err_out:
-        if (disable_dev_on_err)
-                pci_disable_device(pdev);
+        devres_release_group(dev, NULL);
         return rc;
 }