linux-kernel - Re: [PATCH] extcon: Fix return value in extcon_register

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Message-ID: <CAK9yfHwJ5LASrheAuW4CLm8feceS6891tzsnAsBENNkzMzNJ+A@mail.gmail.com>
Date:	Tue, 25 Sep 2012 16:14:07 +0530
From:	Sachin Kamat <sachin.kamat@...aro.org>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	linux-kernel@...r.kernel.org, myungjoo.ham@...sung.com,
	patches@...aro.org
Subject: Re: [PATCH] extcon: Fix return value in extcon_register_interest()

On 25 September 2012 16:02, Chanwoo Choi <cw00.choi@...sung.com> wrote:
> On 09/25/2012 03:58 PM, Sachin Kamat wrote:
>
>> Return the value obtained from extcon_find_cable_index()
>> instead of -ENODEV.
>>
>> Fixes the following smatch info:
>> drivers/extcon/extcon-class.c:478 extcon_register_interest() info:
>> why not propagate 'obj->cable_index' from extcon_find_cable_index()
>> instead of -19?
>>
>> Signed-off-by: Sachin Kamat <sachin.kamat@...aro.org>
>> ---
>>  drivers/extcon/extcon-class.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
>> index 946a318..e996800 100644
>> --- a/drivers/extcon/extcon-class.c
>> +++ b/drivers/extcon/extcon-class.c
>> @@ -475,7 +475,7 @@ int extcon_register_interest(struct extcon_specific_cable_nb *obj,
>>
>>       obj->cable_index = extcon_find_cable_index(obj->edev, cable_name);
>>       if (obj->cable_index < 0)
>> -             return -ENODEV;
>> +             return obj->cable_index;
>>
>>       obj->user_nb = nb;
>>
>
>
> I agree.
> But, if extcon_register_interest() return directly 'obj-cable_index' value
> when extcon_find_cable_index() return -EINVAL, it would spoil readability
> of extcon_register_interest() function. So, I think we can make it as
> following
> patch  a little better.

Ok. I will re-send this with this change.

>
> ---
> diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
> index 936580b..078e6a5 100644
> --- a/drivers/extcon/extcon-class.c
> +++ b/drivers/extcon/extcon-class.c
> @@ -468,7 +468,7 @@ int extcon_register_interest(struct
> extcon_specific_cable_nb *obj,
>
>         obj->cable_index = extcon_find_cable_index(obj->edev, cable_name);
>         if (obj->cable_index < 0)
> -               return -ENODEV;
> +               return -EINVAL;
>
>         obj->user_nb = nb;
>
>
>
> Thanks,
> Chanwoo Choi



-- 
With warm regards,
Sachin
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