2016-09-10 12:54:26 +00:00
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From 71609ab22785edd13b385920b1b0c6de24adc901 Mon Sep 17 00:00:00 2001
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2016-01-17 10:42:23 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 4 Dec 2015 17:41:50 +0000
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2016-09-10 12:54:26 +00:00
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Subject: [PATCH] irq-bcm2836: Prevent spurious interrupts, and trap them early
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2016-01-17 10:42:23 +00:00
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The old arch-specific IRQ macros included a dsb to ensure the
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write to clear the mailbox interrupt completed before returning
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from the interrupt. The BCM2836 irqchip driver needs the same
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precaution to avoid spurious interrupts.
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Spurious interrupts are still possible for other reasons,
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though, so trap them early.
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---
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drivers/irqchip/irq-bcm2836.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/drivers/irqchip/irq-bcm2836.c
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+++ b/drivers/irqchip/irq-bcm2836.c
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@@ -170,9 +170,10 @@ __exception_irq_entry bcm2836_arm_irqchi
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u32 ipi = ffs(mbox_val) - 1;
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writel(1 << ipi, mailbox0);
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+ dsb();
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handle_IPI(ipi, regs);
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#endif
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- } else {
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+ } else if (stat) {
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u32 hwirq = ffs(stat) - 1;
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handle_IRQ(irq_linear_revmap(intc.domain, hwirq), regs);
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