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, 1 insertions, 1 deletions

diff --git a/drivers/ata/ata_generic.c b/drivers/ata/ata_generic.c
index a912ee01a47c..b23e2a1099c5 100644
--- a/drivers/ata/ata_generic.c
+++ b/drivers/ata/ata_generic.c
@@ -152,7 +152,7 @@ static int ata_generic_init_one(struct pci_dev *dev, const struct pci_device_id
         if (dev->vendor == PCI_VENDOR_ID_AL)
                 ata_pci_clear_simplex(dev);
 
-        return ata_pci_init_one(dev, ppi, &generic_sht);
+        return ata_pci_init_one(dev, ppi, &generic_sht, NULL);
 }
 
 static struct pci_device_id ata_generic[] = {