Merge branch 'for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata

Pull libata update from Tejun Heo:
 "AHCI is getting per-port irq handling and locks for better
  scalability.  The gain is not huge but measureable with multiple high
  iops devices connected to the same host; however, the value of
  threaded IRQ handling seems negligible for AHCI and it likely will
  revert to non-threaded handling soon.

  Another noteworthy change is George Spelvin's "libata: Un-break ATA
  blacklist".  During 3.17 devel cycle, the libata blacklist glob
  matching got generalized and rewritten; unfortunately, the patch
  forgot to swap arguments to match the new match function and ended up
  breaking blacklist matching completely.  It got noticed only a couple
  days ago so it couldn't make for-3.17-fixes either.  :(

  Other than the above two, nothing too interesting - the usual cleanup
  churns and device-specific changes"

* 'for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata: (22 commits)
  pata_serverworks: disable 64-KB DMA transfers on Broadcom OSB4 IDE Controller
  libata: Un-break ATA blacklist
  AHCI: Do not acquire ata_host::lock from single IRQ handler
  AHCI: Optimize single IRQ interrupt processing
  AHCI: Do not read HOST_IRQ_STAT reg in multi-MSI mode
  AHCI: Make few function names more descriptive
  AHCI: Move host activation code into ahci_host_activate()
  AHCI: Move ahci_host_activate() function to libahci.c
  AHCI: Pass SCSI host template as arg to ahci_host_activate()
  ata: pata_imx: Use the SIMPLE_DEV_PM_OPS() macro
  AHCI: Cleanup checking of multiple MSIs/SLM modes
  libata-sff: Fix controllers with no ctl port
  ahci_xgene: Fix the error print invalid resource for APM X-Gene SoC AHCI SATA Host Controller driver.
  libata: change ata_<foo>_printk routines to return void
  ata: qcom: Add device tree bindings information
  ahci-platform: Bump max number of clocks to 5
  ahci: ahci_p5wdh_workaround - constify DMI table
  libahci_platform: Staticize ahci_platform_<en/dis>able_phys()
  pata_platform: Remove useless irq_flags field
  pata_of_platform: Remove "electra-ide" quirk
  ...

1 files changed, 7 insertions, 75 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index a0cc0ed..5f039f1 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -790,7 +790,7 @@ static void ahci_pci_print_info(struct ata_host *host)
  */
 static void ahci_p5wdh_workaround(struct ata_host *host)
 {
-	static struct dmi_system_id sysids[] = {
+	static const struct dmi_system_id sysids[] = {
 		{
 			.ident = "P5W DH Deluxe",
 			.matches = {
@@ -1221,6 +1221,9 @@ static int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports,
 		goto single_msi;
 	}
 
+	if (nvec > 1)
+		hpriv->flags |= AHCI_HFLAG_MULTI_MSI;
+
 	return nvec;
 
 single_msi:
@@ -1233,71 +1236,6 @@ intx:
 	return 0;
 }
 
-/**
- *	ahci_host_activate - start AHCI host, request IRQs and register it
- *	@host: target ATA host
- *	@irq: base IRQ number to request
- *	@n_msis: number of MSIs allocated for this host
- *	@irq_handler: irq_handler used when requesting IRQs
- *	@irq_flags: irq_flags used when requesting IRQs
- *
- *	Similar to ata_host_activate, but requests IRQs according to AHCI-1.1
- *	when multiple MSIs were allocated. That is one MSI per port, starting
- *	from @irq.
- *
- *	LOCKING:
- *	Inherited from calling layer (may sleep).
- *
- *	RETURNS:
- *	0 on success, -errno otherwise.
- */
-int ahci_host_activate(struct ata_host *host, int irq, unsigned int n_msis)
-{
-	int i, rc;
-
-	/* Sharing Last Message among several ports is not supported */
-	if (n_msis < host->n_ports)
-		return -EINVAL;
-
-	rc = ata_host_start(host);
-	if (rc)
-		return rc;
-
-	for (i = 0; i < host->n_ports; i++) {
-		struct ahci_port_priv *pp = host->ports[i]->private_data;
-
-		/* Do not receive interrupts sent by dummy ports */
-		if (!pp) {
-			disable_irq(irq + i);
-			continue;
-		}
-
-		rc = devm_request_threaded_irq(host->dev, irq + i,
-					       ahci_hw_interrupt,
-					       ahci_thread_fn, IRQF_SHARED,
-					       pp->irq_desc, host->ports[i]);
-		if (rc)
-			goto out_free_irqs;
-	}
-
-	for (i = 0; i < host->n_ports; i++)
-		ata_port_desc(host->ports[i], "irq %d", irq + i);
-
-	rc = ata_host_register(host, &ahci_sht);
-	if (rc)
-		goto out_free_all_irqs;
-
-	return 0;
-
-out_free_all_irqs:
-	i = host->n_ports;
-out_free_irqs:
-	for (i--; i >= 0; i--)
-		devm_free_irq(host->dev, irq + i, host->ports[i]);
-
-	return rc;
-}
-
 static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	unsigned int board_id = ent->driver_data;
@@ -1306,7 +1244,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	struct device *dev = &pdev->dev;
 	struct ahci_host_priv *hpriv;
 	struct ata_host *host;
-	int n_ports, n_msis, i, rc;
+	int n_ports, i, rc;
 	int ahci_pci_bar = AHCI_PCI_BAR_STANDARD;
 
 	VPRINTK("ENTER\n");
@@ -1459,9 +1397,7 @@ 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));
 
-	n_msis = ahci_init_interrupts(pdev, n_ports, hpriv);
-	if (n_msis > 1)
-		hpriv->flags |= AHCI_HFLAG_MULTI_MSI;
+	ahci_init_interrupts(pdev, n_ports, hpriv);
 
 	host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
 	if (!host)
@@ -1513,11 +1449,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	pci_set_master(pdev);
 
-	if (hpriv->flags & AHCI_HFLAG_MULTI_MSI)
-		return ahci_host_activate(host, pdev->irq, n_msis);
-
-	return ata_host_activate(host, pdev->irq, ahci_interrupt, IRQF_SHARED,
-				 &ahci_sht);
+	return ahci_host_activate(host, pdev->irq, &ahci_sht);
 }
 
 module_pci_driver(ahci_pci_driver);