linux-kernel - Re: [PATCH] Input: adp5588-keys: cancel workqueue in failure path

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Message-ID: <CAMf-jS=jvo2hzULv_MtvbeAq_A2z0aJS2F=1Zx5tPonKsJTrNg@mail.gmail.com>
Date:	Wed, 8 Oct 2014 15:48:37 +0530
From:	Pramod Gurav <pramod.gurav.etc@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Pramod Gurav <pramod.gurav@...rtplayin.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michael Hennerich <michael.hennerich@...log.com>,
	linux-input@...r.kernel.org
Subject: Re: [PATCH] Input: adp5588-keys: cancel workqueue in failure path

Hi Dmitry,

On Tue, Oct 7, 2014 at 10:08 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> On Tue, Oct 07, 2014 at 01:00:49PM +0530, Pramod Gurav wrote:
>> This change introduces a label to call cancel_delayed_work_sync in
>> failure path.
>>
>> Cc: Michael Hennerich <michael.hennerich@...log.com>
>> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
>> Cc: linux-input@...r.kernel.org
>> Signed-off-by: Pramod Gurav <pramod.gurav@...rtplayin.com>
>> ---
>>  drivers/input/keyboard/adp5588-keys.c |    4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/input/keyboard/adp5588-keys.c b/drivers/input/keyboard/adp5588-keys.c
>> index 5ef7fcf..b494062 100644
>> --- a/drivers/input/keyboard/adp5588-keys.c
>> +++ b/drivers/input/keyboard/adp5588-keys.c
>> @@ -559,7 +559,7 @@ static int adp5588_probe(struct i2c_client *client,
>>       error = input_register_device(input);
>>       if (error) {
>>               dev_err(&client->dev, "unable to register input device\n");
>> -             goto err_free_mem;
>> +             goto err_delayed_work;
>>       }
>>
>>       error = request_irq(client->irq, adp5588_irq,
>> @@ -592,6 +592,8 @@ static int adp5588_probe(struct i2c_client *client,
>>   err_unreg_dev:
>>       input_unregister_device(input);
>>       input = NULL;
>> + err_delayed_work:
>> +     cancel_delayed_work_sync(&kpad->work);
>
> We do not need to have a separate label, just need to cancel workqueue
> after freeing interrupt. I adjusted the patch and applied.
>
Thanks. I saw the change in your tree. Shouldn't
cancel_delayed_work_sync(&kpad->work) be called under label
err_free_mem so that it will executed in case adp5588_read,
input_register_device, request_irq etc.
Or else we will still have workqueue instance hanging around.

> Thanks.
>
> --
> Dmitry
> --
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-- 
Thanks and Regards
Pramod
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