linux-kernel - Re: [PATCH] GPIO_KEYS: If devm_add_action() fails, we are explicitly calling the cleanup to freethe resources allocated. Use the helper devm_add_action_or_reset() and return directly in case of error, since the cleanup function has been already called by the helper if there was any error.

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Message-ID: <577CE9EB.9060202@gmail.com>
Date:	Wed, 6 Jul 2016 16:52:19 +0530
From:	arvind Yadav <arvind.yadav.cs@...il.com>
To:	Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:	dmitry.torokhov@...il.com, ldewangan@...dia.com,
	linus.walleij@...aro.org, van.freenix@...il.com,
	bjorn.andersson@...ymobile.com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] GPIO_KEYS: If devm_add_action() fails, we are explicitly
 calling the cleanup to freethe resources allocated. Use the helper
 devm_add_action_or_reset() and return directly in case of error, since the
 cleanup function has been already called by the helper if there was any
 error.

Sorry for subject. Thanks for reviewing my patch. I will take care and 
follow the standard now.

regards,
Arvind


On Tuesday 05 July 2016 10:31 PM, Bjorn Andersson wrote:
> On Tue 05 Jul 09:18 PDT 2016, Arvind Yadav wrote:
>
> Your subject line should be a short and descriptive summary, followed by
> an empty line and then potentially a longer description motivating your
> patch.  Please read section #14 of Documentation/SubmittingPatches.
>
>> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
>> ---
>>   drivers/input/keyboard/gpio_keys.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
>> index 2909365..a2fa3bb 100644
>> --- a/drivers/input/keyboard/gpio_keys.c
>> +++ b/drivers/input/keyboard/gpio_keys.c
>> @@ -542,7 +542,8 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
>>   	 * Install custom action to cancel release timer and
>>   	 * workqueue item.
>>   	 */
>> -	error = devm_add_action(&pdev->dev, gpio_keys_quiesce_key, bdata);
>> +	error = devm_add_action_or_reset(&pdev->dev, gpio_keys_quiesce_key,
>> +					bdata);
> The code leading up to this initializes the timer and work struct, but
> they are not triggered unless their respective isr is exectued. This
> would not happen until after the request_irq at the end of the function.
>
> As such there doesn't appear to be a reason for cancelling any work or
> timers.
>
>>   	if (error) {
>>   		dev_err(&pdev->dev,
>>   			"failed to register quiesce action, error: %d\n",
> Regards,
> Bjorn