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From 9d4cba66a74cbdf25f43a7a8cc360370214ba5fc Mon Sep 17 00:00:00 2001
From: "Joe.C" <yingjoe.chen@mediatek.com>
Date: Fri, 1 May 2015 15:43:24 +0800
Subject: [PATCH 39/76] clocksource: mediatek: Don't run event_handler if it
 is NULL

Spurious timer interrupt is noticed in mtk timer and cause kernel
crash. In mtk_timer_interrupt(), only run event_handler if it is
not NULL.

Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
---
 drivers/clocksource/mtk_timer.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c
index 68ab423..85e0ab5 100644
--- a/drivers/clocksource/mtk_timer.c
+++ b/drivers/clocksource/mtk_timer.c
@@ -143,7 +143,8 @@ static irqreturn_t mtk_timer_interrupt(int irq, void *dev_id)
 
 	/* Acknowledge timer0 irq */
 	writel(GPT_IRQ_ACK(GPT_CLK_EVT), evt->gpt_base + GPT_IRQ_ACK_REG);
-	evt->dev.event_handler(&evt->dev);
+	if (evt->dev.event_handler)
+		evt->dev.event_handler(&evt->dev);
 
 	return IRQ_HANDLED;
 }
-- 
1.7.10.4