[PATCH 1/7] clocksource: mediatek: Don't run event_handler if it is NULL

[Matthias Brugger]

2015-05-04 10:14 GMT+02:00 Daniel Lezcano <daniel.lezcano at linaro.org>:
> On 05/01/2015 09:43 AM, Yingjoe Chen wrote:
>>
>> 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 at 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;
>>   }
>>
>
> This fix does not look good.
>
> Could you try by requesting the irq *after* clockevents_config_and_register
> in the init sequence [1] ?
>

>From my understanding [1] should already fix this.

[1] https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/clocksource/mtk_timer.c?id=d4a19eb3b15a4ba98f627182f48d5bc0cffae670

Regards,
Matthias

-- 
motzblog.wordpress.com