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- From 3031c97bab942c5bc206ea1eef5be76f147026f9 Mon Sep 17 00:00:00 2001
- From: Phil Elwell <phil@raspberrypi.org>
- Date: Fri, 4 Dec 2015 17:41:50 +0000
- Subject: [PATCH 005/381] irq-bcm2836: Prevent spurious interrupts, and trap
- them early
- The old arch-specific IRQ macros included a dsb to ensure the
- write to clear the mailbox interrupt completed before returning
- from the interrupt. The BCM2836 irqchip driver needs the same
- precaution to avoid spurious interrupts.
- Spurious interrupts are still possible for other reasons,
- though, so trap them early.
- ---
- drivers/irqchip/irq-bcm2836.c | 3 ++-
- 1 file changed, 2 insertions(+), 1 deletion(-)
- --- a/drivers/irqchip/irq-bcm2836.c
- +++ b/drivers/irqchip/irq-bcm2836.c
- @@ -170,9 +170,10 @@ __exception_irq_entry bcm2836_arm_irqchi
- u32 ipi = ffs(mbox_val) - 1;
-
- writel(1 << ipi, mailbox0);
- + dsb();
- handle_IPI(ipi, regs);
- #endif
- - } else {
- + } else if (stat) {
- u32 hwirq = ffs(stat) - 1;
-
- handle_IRQ(irq_linear_revmap(intc.domain, hwirq), regs);
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