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, 6 insertions, 6 deletions

diff --git a/drivers/ata/pata_hpt366.c b/drivers/ata/pata_hpt366.c
index b62d398ed84b..c2d4923d4db7 100644
--- a/drivers/ata/pata_hpt366.c
+++ b/drivers/ata/pata_hpt366.c
@@ -356,9 +356,9 @@ static int hpt36x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
                 .udma_mask = ATA_UDMA4,
                 .port_ops = &hpt366_port_ops
         };
-        struct ata_port_info info = info_hpt366;
-        const struct ata_port_info *ppi[] = { &info, NULL };
+        const struct ata_port_info *ppi[] = { &info_hpt366, NULL };
 
+        void *hpriv = NULL;
         u32 class_rev;
         u32 reg1;
         int rc;
@@ -383,17 +383,17 @@ static int hpt36x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
         /* info_hpt366 is safe against re-entry so we can scribble on it */
         switch((reg1 & 0x700) >> 8) {
                 case 5:
-                        info.private_data = &hpt366_40;
+                        hpriv = &hpt366_40;
                         break;
                 case 9:
-                        info.private_data = &hpt366_25;
+                        hpriv = &hpt366_25;
                         break;
                 default:
-                        info.private_data = &hpt366_33;
+                        hpriv = &hpt366_33;
                         break;
         }
         /* Now kick off ATA set up */
-        return ata_pci_init_one(dev, ppi, &hpt36x_sht);
+        return ata_pci_init_one(dev, ppi, &hpt36x_sht, hpriv);
 }
 
 #ifdef CONFIG_PM