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sata_mv: disregard masked irqs

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Part four of simplifying/fixing handling of the main_irq_mask register
to resolve unexpected interrupt issues observed in 2.6.26-rc*.

Ignore masked IRQs in mv_interrupt().
This prevents "unexpected device interrupt while idle" messages.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Mark Lord 2008-05-17 13:37:07 -04:00 committed by Jeff Garzik
parent 88e675e193
commit a44253d24a
1 changed files with 5 additions and 4 deletions
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9
drivers/ata/sata_mv.c
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@ -2200,20 +2200,21 @@ static irqreturn_t mv_interrupt(int irq, void *dev_instance)
struct ata_host *host = dev_instance;
struct mv_host_priv *hpriv = host->private_data;
unsigned int handled = 0;
u32 main_irq_cause, main_irq_mask;
u32 main_irq_cause, main_irq_mask, pending_irqs;
spin_lock(&host->lock);
main_irq_cause = readl(hpriv->main_irq_cause_addr);
main_irq_mask = readl(hpriv->main_irq_mask_addr);
pending_irqs = main_irq_cause & main_irq_mask;
/*
* Deal with cases where we either have nothing pending, or have read
* a bogus register value which can indicate HW removal or PCI fault.
*/
if ((main_irq_cause & main_irq_mask) && (main_irq_cause != 0xffffffffU)) {
if (unlikely((main_irq_cause & PCI_ERR) && HAS_PCI(host)))
if (pending_irqs && main_irq_cause != 0xffffffffU) {
if (unlikely((pending_irqs & PCI_ERR) && HAS_PCI(host)))
handled = mv_pci_error(host, hpriv->base);
else
handled = mv_host_intr(host, main_irq_cause);
handled = mv_host_intr(host, pending_irqs);
}
spin_unlock(&host->lock);
return IRQ_RETVAL(handled);