openwrtv4/target/linux/mediatek/patches/0039-clocksource-mediatek-Don-t-run-event_handler-if-it-i.patch

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(-)

--- a/drivers/clocksource/mtk_timer.c
+++ b/drivers/clocksource/mtk_timer.c
@@ -143,7 +143,8 @@ static irqreturn_t mtk_timer_interrupt(i
 
 	/* 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;
 }