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, 2 insertions, 16 deletions

diff --git a/drivers/ata/pata_marvell.c b/drivers/ata/pata_marvell.c
index d8da4f34..d38e64c 100644
--- a/drivers/ata/pata_marvell.c
+++ b/drivers/ata/pata_marvell.c
@@ -75,20 +75,6 @@ static int marvell_cable_detect(struct ata_port *ap)
 	return 0;	/* Our BUG macro needs the right markup */
 }
 
-/**
- *	marvell_error_handler - Setup and error handler
- *	@ap: Port to handle
- *
- *	LOCKING:
- *	None (inherited from caller).
- */
-
-static void marvell_error_handler(struct ata_port *ap)
-{
-	ata_bmdma_drive_eh(ap, marvell_pre_reset, ata_std_softreset, NULL,
-			   ata_std_postreset);
-}
-
 /* No PIO or DMA methods needed for this device */
 
 static struct scsi_host_template marvell_sht = {
@@ -98,7 +84,7 @@ static struct scsi_host_template marvell_sht = {
 static struct ata_port_operations marvell_ops = {
 	.inherits		= &ata_bmdma_port_ops,
 	.cable_detect		= marvell_cable_detect,
-	.error_handler		= marvell_error_handler,
+	.prereset		= marvell_pre_reset,
 };
 
 
@@ -142,7 +128,7 @@ static int marvell_init_one (struct pci_dev *pdev, const struct pci_device_id *i
 	if (pdev->device == 0x6101)
 		ppi[1] = &ata_dummy_port_info;
 
-	return ata_pci_init_one(pdev, ppi, &marvell_sht);
+	return ata_pci_init_one(pdev, ppi, &marvell_sht, NULL);
 }
 
 static const struct pci_device_id marvell_pci_tbl[] = {