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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>
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@ -177,7 +177,7 @@ __exception_irq_entry bcm2836_arm_irqchip_handle_irq(struct pt_regs *regs)
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writel(1 << ipi, mailbox0);
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handle_IPI(ipi, regs);
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#endif
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} else {
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} else if (stat) {
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u32 hwirq = ffs(stat) - 1;
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handle_IRQ(irq_linear_revmap(intc.domain, hwirq), regs);
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