linux-kernel - Re: [PATCH] extcon: maxim: Fix missing IRQF

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Date:   Sun, 18 Apr 2021 22:41:52 +0800
From:   Guangqing Zhu <zhuguangqing83@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] extcon: maxim: Fix missing IRQF_ONESHOT as only threaded
 handler



On 16/04/2021 16:43, Krzysztof Kozlowski wrote:
> On 15/04/2021 13:36, zhuguangqing83@...il.com wrote:
>> From: Guangqing Zhu <zhuguangqing83@...il.com>
>>
>> Coccinelle noticed:
>>    1. drivers/extcon/extcon-max14577.c:699:8-33: ERROR: Threaded IRQ with
>> no primary handler requested without IRQF_ONESHOT
>>    2. drivers/extcon/extcon-max77693.c:1143:8-33: ERROR: Threaded IRQ with
>> no primary handler requested without IRQF_ONESHOT
>>    3. drivers/extcon/extcon-max77843.c:907:8-33: ERROR: Threaded IRQ with
>> no primary handler requested without IRQF_ONESHOT
>>    4. drivers/extcon/extcon-max8997.c:665:8-28: ERROR: Threaded IRQ with
>> no primary handler requested without IRQF_ONESHOT
>>
>> Signed-off-by: Guangqing Zhu <zhuguangqing83@...il.com>
>> ---
>>   drivers/extcon/extcon-max14577.c | 2 +-
>>   drivers/extcon/extcon-max77693.c | 2 +-
>>   drivers/extcon/extcon-max77843.c | 3 ++-
>>   drivers/extcon/extcon-max8997.c  | 2 +-
>>   4 files changed, 5 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/extcon/extcon-max14577.c b/drivers/extcon/extcon-max14577.c
>> index ace523924e58..af15a9e00ee9 100644
>> --- a/drivers/extcon/extcon-max14577.c
>> +++ b/drivers/extcon/extcon-max14577.c
>> @@ -698,7 +698,7 @@ static int max14577_muic_probe(struct platform_device *pdev)
>>   
>>   		ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
>>   				max14577_muic_irq_handler,
>> -				IRQF_NO_SUSPEND,
>> +				IRQF_NO_SUSPEND | IRQF_ONESHOT,
> 
> The same with all other patches for IRQF_ONESHOT which are send recently:
> 1. On what board did you test it?

I didn't test it.

> 2. Is this just blind patch from Coccinelle without investigation
> whether it is needed (hint: it's not needed here, it does not use
> default primary handler).

I found the error notice from Coccinelle and I saw the code. Maybe
I'm mistaken, I think it's needed here. Because handler == NULL and
thread_fn != NULL, it use irq_default_primary_handler() in
request_threaded_irq().

> 3. If you think otherwise, please explain.
> 
> Best regards,
> Krzysztof
> 

Thanks for your review.

Best regards,
Guangqing Zhu