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

   1 From 9d4cba66a74cbdf25f43a7a8cc360370214ba5fc Mon Sep 17 00:00:00 2001
   2 From: "Joe.C" <yingjoe.chen@mediatek.com>
   3 Date: Fri, 1 May 2015 15:43:24 +0800
   4 Subject: [PATCH 39/76] clocksource: mediatek: Don't run event_handler if it
   5  is NULL
   6
   7 Spurious timer interrupt is noticed in mtk timer and cause kernel
   8 crash. In mtk_timer_interrupt(), only run event_handler if it is
   9 not NULL.
  10
  11 Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
  12 ---
  13  drivers/clocksource/mtk_timer.c |    3 ++-
  14  1 file changed, 2 insertions(+), 1 deletion(-)
  15
  16 diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c
  17 index 68ab423..85e0ab5 100644
  18 --- a/drivers/clocksource/mtk_timer.c
  19 +++ b/drivers/clocksource/mtk_timer.c
  20 @@ -143,7 +143,8 @@ static irqreturn_t mtk_timer_interrupt(int irq, void *dev_id)
  21
  22         /* Acknowledge timer0 irq */
  23         writel(GPT_IRQ_ACK(GPT_CLK_EVT), evt->gpt_base + GPT_IRQ_ACK_REG);
  24 -       evt->dev.event_handler(&evt->dev);
  25 +       if (evt->dev.event_handler)
  26 +               evt->dev.event_handler(&evt->dev);
  27
  28         return IRQ_HANDLED;
  29  }
  30 --
  31 1.7.10.4
  32