From a8c775fc3196db046a95b55f063b24174371a334 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Thu, 27 Oct 2016 16:21:19 +0100 Subject: 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. Signed-off-by: Phil Elwell --- drivers/irqchip/irq-bcm2836.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/irqchip/irq-bcm2836.c b/drivers/irqchip/irq-bcm2836.c index e7463e3c0814..a8db33b50ad9 100644 --- a/drivers/irqchip/irq-bcm2836.c +++ b/drivers/irqchip/irq-bcm2836.c @@ -175,6 +175,7 @@ __exception_irq_entry bcm2836_arm_irqchip_handle_irq(struct pt_regs *regs) u32 ipi = ffs(mbox_val) - 1; writel(1 << ipi, mailbox0); + dsb(sy); handle_IPI(ipi, regs); #endif } else if (stat) { -- cgit