[PATCH 4.16 48/52] irqchip/qcom: Fix check for spurious interrupts

[Greg Kroah-Hartman]

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Agustin Vega-Frias <agustinv at codeaurora.org>

commit 1bc2463cee92ef0e2034c813d5e511adeb58b5fd upstream.

When the interrupts for a combiner span multiple registers it must be
checked if any interrupts have been asserted on each register before
checking for spurious interrupts.

Checking each register seperately leads to false positive warnings.

[ tglx: Massaged changelog ]

Fixes: f20cc9b00c7b ("irqchip/qcom: Add IRQ combiner driver")
Signed-off-by: Agustin Vega-Frias <agustinv at codeaurora.org>
Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
Cc: Jason Cooper <jason at lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier at arm.com>
Cc: timur at codeaurora.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: stable at vger.kernel.org
Link: https://lkml.kernel.org/r/1525184090-26143-1-git-send-email-agustinv@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

---
 drivers/irqchip/qcom-irq-combiner.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/irqchip/qcom-irq-combiner.c
+++ b/drivers/irqchip/qcom-irq-combiner.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -68,7 +68,7 @@ static void combiner_handle_irq(struct i
 
 		bit = readl_relaxed(combiner->regs[reg].addr);
 		status = bit & combiner->regs[reg].enabled;
-		if (!status)
+		if (bit && !status)
 			pr_warn_ratelimited("Unexpected IRQ on CPU%d: (%08x %08lx %p)\n",
 					    smp_processor_id(), bit,
 					    combiner->regs[reg].enabled,