libata: stop overloading port_info->private_data

port_info->private_data is currently used for two purposes - to record
private data about the port_info or to specify host->private_data to
use when allocating ata_host.

This overloading is confusing and counter-intuitive in that
port_info->private_data becomes host->private_data instead of
port->private_data.  In addition, port_info and host don't correspond
to each other 1-to-1.  Currently, the first non-NULL
port_info->private_data is used.

This patch makes port_info->private_data just be what it is -
private_data for the port_info where LLD can jot down extra info.
libata no longer sets host->private_data to the first non-NULL
port_info->private_data, @host_priv argument is added to
ata_pci_init_one() instead.  LLDs which use ata_pci_init_one() can use
this argument to pass in pointer to host private data.  LLDs which
don't should use init-register model anyway and can initialize
host->private_data directly.

Adding @host_priv instead of using init-register model for LLDs which
use ata_pci_init_one() is suggested by Alan Cox.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>

1 files changed, 7 insertions, 20 deletions

diff --git a/drivers/ata/pata_amd.c b/drivers/ata/pata_amd.c
index 644702cac6ee..09c8286b6890 100644
--- a/drivers/ata/pata_amd.c
+++ b/drivers/ata/pata_amd.c
@@ -144,12 +144,6 @@ static int amd_pre_reset(struct ata_link *link, unsigned long deadline)
         return ata_std_prereset(link, deadline);
 }
 
-static void amd_error_handler(struct ata_port *ap)
-{
-        ata_bmdma_drive_eh(ap, amd_pre_reset, ata_std_softreset, NULL,
-                           ata_std_postreset);
-}
-
 static int amd_cable_detect(struct ata_port *ap)
 {
         static const u32 bitmask[2] = {0x03, 0x0C};
@@ -300,13 +294,6 @@ static int nv_pre_reset(struct ata_link *link, unsigned long deadline)
         return ata_std_prereset(link, deadline);
 }
 
-static void nv_error_handler(struct ata_port *ap)
-{
-        ata_bmdma_drive_eh(ap, nv_pre_reset,
-                               ata_std_softreset, NULL,
-                               ata_std_postreset);
-}
-
 /**
  *      nv100_set_piomode       -       set initial PIO mode data
  *      @ap: ATA interface
@@ -358,7 +345,7 @@ static struct scsi_host_template amd_sht = {
 
 static const struct ata_port_operations amd_base_port_ops = {
         .inherits       = &ata_bmdma_port_ops,
-        .error_handler  = amd_error_handler,
+        .prereset       = amd_pre_reset,
 };
 
 static struct ata_port_operations amd33_port_ops = {
@@ -393,7 +380,7 @@ static const struct ata_port_operations nv_base_port_ops = {
         .inherits       = &ata_bmdma_port_ops,
         .cable_detect   = ata_cable_ignore,
         .mode_filter    = nv_mode_filter,
-        .error_handler  = nv_error_handler,
+        .prereset       = nv_pre_reset,
         .host_stop      = nv_host_stop,
 };
 
@@ -483,10 +470,10 @@ static int amd_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
                         .port_ops = &amd100_port_ops
                 }
         };
-        struct ata_port_info pi;
-        const struct ata_port_info *ppi[] = { &pi, NULL };
+        const struct ata_port_info *ppi[] = { NULL, NULL };
         static int printed_version;
         int type = id->driver_data;
+        void *hpriv = NULL;
         u8 fifo;
         int rc;
 
@@ -511,7 +498,7 @@ static int amd_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
         /*
          * Okay, type is determined now.  Apply type-specific workarounds.
          */
-        pi = info[type];
+        ppi[0] = &info[type];
 
         if (type < 3)
                 ata_pci_clear_simplex(pdev);
@@ -530,11 +517,11 @@ static int amd_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
                 u32 udma;
 
                 pci_read_config_dword(pdev, 0x60, &udma);
-                pi.private_data = (void *)(unsigned long)udma;
+                hpriv = (void *)(unsigned long)udma;
         }
 
         /* And fire it up */
-        return ata_pci_init_one(pdev, ppi, &amd_sht);
+        return ata_pci_init_one(pdev, ppi, &amd_sht, hpriv);
 }
 
 #ifdef CONFIG_PM