Commit-ID: a51744ddcc62925ec4d3d3d3a8a13bdd2033af59
Gitweb: http://git.kernel.org/tip/a51744ddcc62925ec4d3d3d3a8a13bdd2033af59
Author: Andrea Merello <andrea.merello@xxxxxxxxx>
AuthorDate: Sat, 26 Dec 2015 13:47:23 -0800
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Tue, 29 Dec 2015 11:40:45 +0100
irqchip/bcm2836: Tolerate IRQs while no flag is set in ISR
On my RPi2 I got a lot of:
unexpected IRQ trap at vector 00
This happens because bcm2836_arm_irqchip_handle_irq() is sometimes
invoked even if the ISR is clear, and this case is not handled.
This patch explicitly handle this case, fixing the kernel complaints
about the bad IRQ lookup.
Signed-off-by: Andrea Merello <andrea.merello@xxxxxxxxx>
Reviewed-by: Eric Anholt <eric@xxxxxxxxxx>
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: Stephen Warren <swarren@xxxxxxxxxxxxx>
Cc: Lee Jones <lee@xxxxxxxxxx>
Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: linux-rpi-kernel@xxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1451166444-11044-4-git-send-email-eric@xxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
drivers/irqchip/irq-bcm2836.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/irqchip/irq-bcm2836.c b/drivers/irqchip/irq-bcm2836.c
index 59ac40c..bb8f234 100644
--- a/drivers/irqchip/irq-bcm2836.c
+++ b/drivers/irqchip/irq-bcm2836.c
@@ -177,7 +177,7 @@ __exception_irq_entry bcm2836_arm_irqchip_handle_irq(struct pt_regs *regs)
writel(1 << ipi, mailbox0);
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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