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libahci: Refactoring of ahci_single_irq_intr function.

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This patch refactors the ahci_single_irq_intr function and also rename
it to ahci_single_level_irq_intr as it handles a level triggered latch.

Signed-off-by: Suman tripathi <stripathi@apm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Suman Tripathi 2015-05-06 00:51:10 +05:30 committed by Tejun Heo
parent 4b9d64ee04
commit a129db89d8
1 changed files with 30 additions and 21 deletions
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51
drivers/ata/libahci.c
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@ -1826,27 +1826,9 @@ static irqreturn_t ahci_multi_irqs_intr(int irq, void *dev_instance)
return IRQ_WAKE_THREAD;
}
static irqreturn_t ahci_single_irq_intr(int irq, void *dev_instance)
static u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
{
struct ata_host *host = dev_instance;
struct ahci_host_priv *hpriv;
unsigned int i, handled = 0;
void __iomem *mmio;
u32 irq_stat, irq_masked;
VPRINTK("ENTER\n");
hpriv = host->private_data;
mmio = hpriv->mmio;
/* sigh. 0xffffffff is a valid return from h/w */
irq_stat = readl(mmio + HOST_IRQ_STAT);
if (!irq_stat)
return IRQ_NONE;
irq_masked = irq_stat & hpriv->port_map;
spin_lock(&host->lock);
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap;
@ -1868,6 +1850,33 @@ static irqreturn_t ahci_single_irq_intr(int irq, void *dev_instance)
handled = 1;
}
return handled;
}
static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance)
{
struct ata_host *host = dev_instance;
struct ahci_host_priv *hpriv;
unsigned int rc = 0;
void __iomem *mmio;
u32 irq_stat, irq_masked;
VPRINTK("ENTER\n");
hpriv = host->private_data;
mmio = hpriv->mmio;
/* sigh. 0xffffffff is a valid return from h/w */
irq_stat = readl(mmio + HOST_IRQ_STAT);
if (!irq_stat)
return IRQ_NONE;
irq_masked = irq_stat & hpriv->port_map;
spin_lock(&host->lock);
rc = ahci_handle_port_intr(host, irq_masked);
/* HOST_IRQ_STAT behaves as level triggered latch meaning that
* it should be cleared after all the port events are cleared;
* otherwise, it will raise a spurious interrupt after each
@ -1883,7 +1892,7 @@ static irqreturn_t ahci_single_irq_intr(int irq, void *dev_instance)
VPRINTK("EXIT\n");
return IRQ_RETVAL(handled);
return IRQ_RETVAL(rc);
}
unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
@ -2487,7 +2496,7 @@ int ahci_host_activate(struct ata_host *host, int irq,
if (hpriv->flags & AHCI_HFLAG_MULTI_MSI)
rc = ahci_host_activate_multi_irqs(host, irq, sht);
else
rc = ata_host_activate(host, irq, ahci_single_irq_intr,
rc = ata_host_activate(host, irq, ahci_single_level_irq_intr,
IRQF_SHARED, sht);
return rc;
}