libata: update libata LLDs to use devres

Update libata LLDs to use devres.  Core layer is already converted to
support managed LLDs.  This patch simplifies initialization and fixes
many resource related bugs in init failure and detach path.  For
example, all converted drivers now handle ata_device_add() failure
gracefully without excessive resource rollback code.

As most resources are released automatically on driver detach, many
drivers don't need or can do with much simpler ->{port|host}_stop().
In general, stop callbacks are need iff port or host needs to be given
commands to shut it down.  Note that freezing is enough in many cases
and ports are automatically frozen before being detached.

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

1 files changed, 12 insertions, 30 deletions

diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
index e95acfac30b9..c7f527578d11 100644
--- a/drivers/ata/sata_via.c
+++ b/drivers/ata/sata_via.c
@@ -44,7 +44,6 @@
 #include <linux/device.h>
 #include <scsi/scsi_host.h>
 #include <linux/libata.h>
-#include <asm/io.h>
 
 #define DRV_NAME        "sata_via"
 #define DRV_VERSION     "2.0"
@@ -146,8 +145,6 @@ static const struct ata_port_operations vt6420_sata_ops = {
         .irq_clear              = ata_bmdma_irq_clear,
 
         .port_start             = ata_port_start,
-        .port_stop              = ata_port_stop,
-        .host_stop              = ata_host_stop,
 };
 
 static const struct ata_port_operations vt6421_pata_ops = {
@@ -180,8 +177,6 @@ static const struct ata_port_operations vt6421_pata_ops = {
         .irq_clear              = ata_bmdma_irq_clear,
 
         .port_start             = vt6421_port_start,
-        .port_stop              = ata_port_stop,
-        .host_stop              = ata_host_stop,
 };
 
 static const struct ata_port_operations vt6421_sata_ops = {
@@ -214,8 +209,6 @@ static const struct ata_port_operations vt6421_sata_ops = {
         .scr_write              = svia_scr_write,
 
         .port_start             = vt6421_port_start,
-        .port_stop              = ata_port_stop,
-        .host_stop              = ata_host_stop,
 };
 
 static struct ata_port_info vt6420_port_info = {
@@ -446,7 +439,7 @@ static struct ata_probe_ent *vt6421_init_probe_ent(struct pci_dev *pdev)
         struct ata_probe_ent *probe_ent;
         unsigned int i;
 
-        probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+        probe_ent = devm_kzalloc(&pdev->dev, sizeof(*probe_ent), GFP_KERNEL);
         if (!probe_ent)
                 return NULL;
 
@@ -517,20 +510,19 @@ static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
         struct ata_probe_ent *probe_ent;
         int board_id = (int) ent->driver_data;
         const int *bar_sizes;
-        int pci_dev_busy = 0;
         u8 tmp8;
 
         if (!printed_version++)
                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 
-        rc = pci_enable_device(pdev);
+        rc = pcim_enable_device(pdev);
         if (rc)
                 return rc;
 
         rc = pci_request_regions(pdev, DRV_NAME);
         if (rc) {
-                pci_dev_busy = 1;
-                goto err_out;
+                pcim_pin_device(pdev);
+                return rc;
         }
 
         if (board_id == vt6420) {
@@ -539,8 +531,7 @@ static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
                         dev_printk(KERN_ERR, &pdev->dev,
                                    "SATA master/slave not supported (0x%x)\n",
                                    (int) tmp8);
-                        rc = -EIO;
-                        goto err_out_regions;
+                        return -EIO;
                 }
 
                 bar_sizes = &svia_bar_sizes[0];
@@ -556,16 +547,15 @@ static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
                                 i,
                                 (unsigned long long)pci_resource_start(pdev, i),
                                 (unsigned long long)pci_resource_len(pdev, i));
-                        rc = -ENODEV;
-                        goto err_out_regions;
+                        return -ENODEV;
                 }
 
         rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
         if (rc)
-                goto err_out_regions;
+                return rc;
         rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
         if (rc)
-                goto err_out_regions;
+                return rc;
 
         if (board_id == vt6420)
                 probe_ent = vt6420_init_probe_ent(pdev);
@@ -574,26 +564,18 @@ static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 
         if (!probe_ent) {
                 dev_printk(KERN_ERR, &pdev->dev, "out of memory\n");
-                rc = -ENOMEM;
-                goto err_out_regions;
+                return -ENOMEM;
         }
 
         svia_configure(pdev);
 
         pci_set_master(pdev);
 
-        /* FIXME: check ata_device_add return value */
-        ata_device_add(probe_ent);
-        kfree(probe_ent);
+        if (!ata_device_add(probe_ent))
+                return -ENODEV;
 
+        devm_kfree(&pdev->dev, probe_ent);
         return 0;
-
-err_out_regions:
-        pci_release_regions(pdev);
-err_out:
-        if (!pci_dev_busy)
-                pci_disable_device(pdev);
-        return rc;
 }
 
 static int __init svia_init(void)