-From 5e9082be2fca137fe13b8af15aa0b9d178cd99c1 Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.org>
-Date: Fri, 4 Dec 2015 17:41:50 +0000
-Subject: [PATCH] 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 | 1 +
- 1 file changed, 1 insertion(+)
-
---- a/drivers/irqchip/irq-bcm2836.c
-+++ b/drivers/irqchip/irq-bcm2836.c
-@@ -144,6 +144,7 @@ __exception_irq_entry bcm2836_arm_irqchi
- u32 ipi = ffs(mbox_val) - 1;
-
- writel(1 << ipi, mailbox0);
-+ dsb(sy);
- handle_IPI(ipi, regs);
- #endif
- } else if (stat) {