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

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Message-ID: <CAK9yfHzLVKph4ts-WdrLX_jftj8B4bf57nrA1ifK_hOCVOBOAQ@mail.gmail.com>
Date:	Tue, 25 Sep 2012 14:50:49 +0530
From:	Sachin Kamat <sachin.kamat@...aro.org>
To:	anish singh <anish198519851985@...il.com>
Cc:	linux-kernel@...r.kernel.org, myungjoo.ham@...sung.com,
	cw00.choi@...sung.com, patches@...aro.org
Subject: Re: [PATCH] extcon: Fix return value in extcon_register_interest()

On 25 September 2012 14:45, anish singh <anish198519851985@...il.com> wrote:
> On Tue, Sep 25, 2012 at 12:28 PM, Sachin Kamat <sachin.kamat@...aro.org> 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;
> I think ENODEV is right here as the function will return negative
> value only when
> there is no such device for which the user is trying to register the interest.
> Is there any problem with that?

extcon_find_cable_index() returns -EINVAL when it fails.
Hence it is better to propagate the same error code instead of a different one.

>>
>>         obj->user_nb = nb;
>>
>> --
>> 1.7.4.1
>>
>> --
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-- 
With warm regards,
Sachin
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