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, 27 insertions, 98 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index d72568392e6..20ab3ffce55 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -45,7 +45,6 @@
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_cmnd.h>
 #include <linux/libata.h>
-#include <asm/io.h>
 
 #define DRV_NAME        "ahci"
 #define DRV_VERSION     "2.0"
@@ -166,9 +165,6 @@ enum {
         PORT_CMD_ICC_PARTIAL    = (0x2 << 28), /* Put i/f in partial state */
         PORT_CMD_ICC_SLUMBER    = (0x6 << 28), /* Put i/f in slumber state */
 
-        /* hpriv->flags bits */
-        AHCI_FLAG_MSI           = (1 << 0),
-
         /* ap->flags bits */
         AHCI_FLAG_NO_NCQ                = (1 << 24),
         AHCI_FLAG_IGN_IRQ_IF_ERR        = (1 << 25), /* ignore IRQ_IF_ERR */
@@ -191,7 +187,6 @@ struct ahci_sg {
 };
 
 struct ahci_host_priv {
-        unsigned long           flags;
         u32                     cap;    /* cache of HOST_CAP register */
         u32                     port_map; /* cache of HOST_PORTS_IMPL reg */
 };
@@ -229,7 +224,6 @@ static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
 static int ahci_port_resume(struct ata_port *ap);
 static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
 static int ahci_pci_device_resume(struct pci_dev *pdev);
-static void ahci_remove_one (struct pci_dev *pdev);
 
 static struct scsi_host_template ahci_sht = {
         .module                 = THIS_MODULE,
@@ -441,9 +435,9 @@ static struct pci_driver ahci_pci_driver = {
         .name                   = DRV_NAME,
         .id_table               = ahci_pci_tbl,
         .probe                  = ahci_init_one,
+        .remove                 = ata_pci_remove_one,
         .suspend                = ahci_pci_device_suspend,
         .resume                 = ahci_pci_device_resume,
-        .remove                 = ahci_remove_one,
 };
 
 
@@ -1426,23 +1420,18 @@ static int ahci_port_start(struct ata_port *ap)
         dma_addr_t mem_dma;
         int rc;
 
-        pp = kmalloc(sizeof(*pp), GFP_KERNEL);
+        pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
         if (!pp)
                 return -ENOMEM;
-        memset(pp, 0, sizeof(*pp));
 
         rc = ata_pad_alloc(ap, dev);
-        if (rc) {
-                kfree(pp);
+        if (rc)
                 return rc;
-        }
 
-        mem = dma_alloc_coherent(dev, AHCI_PORT_PRIV_DMA_SZ, &mem_dma, GFP_KERNEL);
-        if (!mem) {
-                ata_pad_free(ap, dev);
-                kfree(pp);
+        mem = dmam_alloc_coherent(dev, AHCI_PORT_PRIV_DMA_SZ, &mem_dma,
+                                  GFP_KERNEL);
+        if (!mem)
                 return -ENOMEM;
-        }
         memset(mem, 0, AHCI_PORT_PRIV_DMA_SZ);
 
         /*
@@ -1484,9 +1473,7 @@ static int ahci_port_start(struct ata_port *ap)
 
 static void ahci_port_stop(struct ata_port *ap)
 {
-        struct device *dev = ap->host->dev;
         struct ahci_host_priv *hpriv = ap->host->private_data;
-        struct ahci_port_priv *pp = ap->private_data;
         void __iomem *mmio = ap->host->mmio_base;
         void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
         const char *emsg = NULL;
@@ -1496,12 +1483,6 @@ static void ahci_port_stop(struct ata_port *ap)
         rc = ahci_deinit_port(port_mmio, hpriv->cap, &emsg);
         if (rc)
                 ata_port_printk(ap, KERN_WARNING, "%s (%d)\n", emsg, rc);
-
-        ap->private_data = NULL;
-        dma_free_coherent(dev, AHCI_PORT_PRIV_DMA_SZ,
-                          pp->cmd_slot, pp->cmd_slot_dma);
-        ata_pad_free(ap, dev);
-        kfree(pp);
 }
 
 static void ahci_setup_port(struct ata_ioports *port, unsigned long base,
@@ -1669,15 +1650,15 @@ static void ahci_print_info(struct ata_probe_ent *probe_ent)
                 );
 }
 
-static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
         static int printed_version;
-        struct ata_probe_ent *probe_ent = NULL;
+        unsigned int board_idx = (unsigned int) ent->driver_data;
+        struct device *dev = &pdev->dev;
+        struct ata_probe_ent *probe_ent;
         struct ahci_host_priv *hpriv;
         unsigned long base;
         void __iomem *mmio_base;
-        unsigned int board_idx = (unsigned int) ent->driver_data;
-        int have_msi, pci_dev_busy = 0;
         int rc;
 
         VPRINTK("ENTER\n");
@@ -1694,46 +1675,34 @@ static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
                         return -ENODEV;
         }
 
-        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 (pci_enable_msi(pdev) == 0)
-                have_msi = 1;
-        else {
+        if (pci_enable_msi(pdev))
                 pci_intx(pdev, 1);
-                have_msi = 0;
-        }
 
-        probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
-        if (probe_ent == NULL) {
-                rc = -ENOMEM;
-                goto err_out_msi;
-        }
+        probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
+        if (probe_ent == NULL)
+                return -ENOMEM;
 
-        memset(probe_ent, 0, sizeof(*probe_ent));
         probe_ent->dev = pci_dev_to_dev(pdev);
         INIT_LIST_HEAD(&probe_ent->node);
 
-        mmio_base = pci_iomap(pdev, AHCI_PCI_BAR, 0);
-        if (mmio_base == NULL) {
-                rc = -ENOMEM;
-                goto err_out_free_ent;
-        }
+        mmio_base = pcim_iomap(pdev, AHCI_PCI_BAR, 0);
+        if (mmio_base == NULL)
+                return -ENOMEM;
         base = (unsigned long) mmio_base;
 
-        hpriv = kmalloc(sizeof(*hpriv), GFP_KERNEL);
-        if (!hpriv) {
-                rc = -ENOMEM;
-                goto err_out_iounmap;
-        }
-        memset(hpriv, 0, sizeof(*hpriv));
+        hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
+        if (!hpriv)
+                return -ENOMEM;
 
         probe_ent->sht          = ahci_port_info[board_idx].sht;
         probe_ent->port_flags   = ahci_port_info[board_idx].flags;
@@ -1746,13 +1715,10 @@ static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
         probe_ent->mmio_base = mmio_base;
         probe_ent->private_data = hpriv;
 
-        if (have_msi)
-                hpriv->flags |= AHCI_FLAG_MSI;
-
         /* initialize adapter */
         rc = ahci_host_init(probe_ent);
         if (rc)
-                goto err_out_hpriv;
+                return rc;
 
         if (!(probe_ent->port_flags & AHCI_FLAG_NO_NCQ) &&
             (hpriv->cap & HOST_CAP_NCQ))
@@ -1760,48 +1726,11 @@ static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 
         ahci_print_info(probe_ent);
 
-        /* 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(dev, probe_ent);
         return 0;
-
-err_out_hpriv:
-        kfree(hpriv);
-err_out_iounmap:
-        pci_iounmap(pdev, mmio_base);
-err_out_free_ent:
-        kfree(probe_ent);
-err_out_msi:
-        if (have_msi)
-                pci_disable_msi(pdev);
-        else
-                pci_intx(pdev, 0);
-        pci_release_regions(pdev);
-err_out:
-        if (!pci_dev_busy)
-                pci_disable_device(pdev);
-        return rc;
-}
-
-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;
-
-        ata_host_remove(host);
-
-        pci_iounmap(pdev, host->mmio_base);
-
-        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)