4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Marc Zyngier marc.zyngier@arm.com
commit 327ebe1f3a9b7e20e298b39d0cff627169a28012 upstream.
The GIC has no such thing as interrupt 1020: the last valid ID is 1019, and the range 1020-1023 is reserved - 1023 indicating that no interrupt is pending. So let's make sure we don't try to handle this ID.
This bug has been in since the initial GIC code was introduced in 8ad68bbf7a06 ("[ARM] Add support for ARM RealView board").
Reported-by: Eric Auger eric.auger@linaro.org Cc: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Marc Zyngier marc.zyngier@arm.com Signed-off-by: Hanjun Guo hanjun.guo@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/irqchip/irq-gic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/irqchip/irq-gic.c +++ b/drivers/irqchip/irq-gic.c @@ -336,7 +336,7 @@ static void __exception_irq_entry gic_ha irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK); irqnr = irqstat & GICC_IAR_INT_ID_MASK;
- if (likely(irqnr > 15 && irqnr < 1021)) { + if (likely(irqnr > 15 && irqnr < 1020)) { if (static_key_true(&supports_deactivate)) writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI); handle_domain_irq(gic->domain, irqnr, regs);