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authorAndrea Merello <andrea.merello@gmail.com>2015-12-27 00:47:23 +0300
committerThomas Gleixner <tglx@linutronix.de>2015-12-29 13:40:45 +0300
commita51744ddcc62925ec4d3d3d3a8a13bdd2033af59 (patch)
treeac9f70131c4961fd17f8abd2f06607c57d0b388e /drivers/irqchip/irq-bcm2836.c
parent41f4988cc287e5f836d3f6620c9f900bc9b560e9 (diff)
downloadlinux-a51744ddcc62925ec4d3d3d3a8a13bdd2033af59.tar.xz
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@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Eric Anholt <eric@anholt.net> Cc: linux-arm-kernel@lists.infradead.org Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Lee Jones <lee@kernel.org> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: linux-rpi-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1451166444-11044-4-git-send-email-eric@anholt.net Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/irqchip/irq-bcm2836.c')
-rw-r--r--drivers/irqchip/irq-bcm2836.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/irqchip/irq-bcm2836.c b/drivers/irqchip/irq-bcm2836.c
index 59ac40c39551..bb8f234b6b73 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);