a8d4d71c41
As usual these patches were extracted from the raspberry pi repo: https://github.com/raspberrypi/linux/commits/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
31 lines
1,013 B
Diff
31 lines
1,013 B
Diff
From c891de13b385afb3e4b2c97ac5bbea7e2d97252f Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Fri, 4 Dec 2015 17:41:50 +0000
|
|
Subject: [PATCH 005/232] 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);
|