ahci: Store irq number in struct ahci_host_priv

Currently, ahci supports only msi and intx. To also support msix the
handling of the irq number need to be changed. The irq number for msix
devices is taken from msi_list instead of pci_dev. Thus, the irq
number of a device needs to be stored in struct ahci_host_priv now.
This allows the host controller to be activated in a generic way.

This change is only intended for ahci drivers. For that reason the irq
number is stored in struct ahci_host_priv used only by ahci drivers.
Thus, the ABI changes only for ahci_host_activate(), but existing ata
drivers (about 50) are unaffected and keep unchanged. All users of
ahci_host_activate() have been updated.

While touching drivers/ata/libahci.c, doing a small code cleanup in
ahci_port_start().

Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 10 insertions, 5 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 7ba5332..a3c66c3 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1237,14 +1237,18 @@ static int ahci_init_msi(struct pci_dev *pdev, unsigned int n_ports,
 	if (nvec > 1)
 		hpriv->flags |= AHCI_HFLAG_MULTI_MSI;
 
-	return nvec;
+	goto out;
 
 single_msi:
+	nvec = 1;
+
 	rc = pci_enable_msi(pdev);
 	if (rc < 0)
 		return rc;
+out:
+	hpriv->irq = pdev->irq;
 
-	return 1;
+	return nvec;
 }
 
 static int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports,
@@ -1258,6 +1262,7 @@ static int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports,
 
 	/* lagacy intx interrupts */
 	pci_intx(pdev, 1);
+	hpriv->irq = pdev->irq;
 
 	return 0;
 }
@@ -1423,13 +1428,13 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	 */
 	n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 
-	ahci_init_interrupts(pdev, n_ports, hpriv);
-
 	host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
 	if (!host)
 		return -ENOMEM;
 	host->private_data = hpriv;
 
+	ahci_init_interrupts(pdev, n_ports, hpriv);
+
 	if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 		host->flags |= ATA_HOST_PARALLEL_SCAN;
 	else
@@ -1475,7 +1480,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	pci_set_master(pdev);
 
-	return ahci_host_activate(host, pdev->irq, &ahci_sht);
+	return ahci_host_activate(host, &ahci_sht);
 }
 
 module_pci_driver(ahci_pci_driver);