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-rw-r--r--drivers/irqchip/irq-sun4i.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-sun4i.c b/drivers/irqchip/irq-sun4i.c
index 15999551ff7f..7ae85ec61e56 100644
--- a/drivers/irqchip/irq-sun4i.c
+++ b/drivers/irqchip/irq-sun4i.c
@@ -140,10 +140,24 @@ static void __exception_irq_entry sun4i_handle_irq(struct pt_regs *regs)
{
u32 irq, hwirq;
+ /*
+ * hwirq == 0 can mean one of 3 things:
+ * 1) no more irqs pending
+ * 2) irq 0 pending
+ * 3) spurious irq
+ * So if we immediately get a reading of 0, check the irq-pending reg
+ * to differentiate between 2 and 3. We only do this once to avoid
+ * the extra check in the common case of 1 hapening after having
+ * read the vector-reg once.
+ */
hwirq = readl(sun4i_irq_base + SUN4I_IRQ_VECTOR_REG) >> 2;
- while (hwirq != 0) {
+ if (hwirq == 0 &&
+ !(readl(sun4i_irq_base + SUN4I_IRQ_PENDING_REG(0)) & BIT(0)))
+ return;
+
+ do {
irq = irq_find_mapping(sun4i_irq_domain, hwirq);
handle_IRQ(irq, regs);
hwirq = readl(sun4i_irq_base + SUN4I_IRQ_VECTOR_REG) >> 2;
- }
+ } while (hwirq != 0);
}