linux-kernel - Re: [PATCH 4/4] extcon: arizona: Eliminate dead error handling code

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Date:	Tue, 12 Nov 2013 09:15:29 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	myungjoo.ham@...sung.com, sameo@...ux.intel.com,
	lee.jones@...aro.org, patches@...nsource.wolfsonmicro.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] extcon: arizona: Eliminate dead error handling code

Hi CHarles,

On 11/08/2013 10:19 PM, Charles Keepax wrote:
> As a small disclaimer I would personally prefer to not merge this patch.
> I have added it based on previous code review of the other patches in
> this chain.
> 
> arizona_hpdet_do_id currently can only return 0 or -EAGAIN making the
> else if clause handling error codes redundant, this patch removes this
> clause.
> 
> Whilst this clause is not currently hit removing it makes the code
> fragile. It will not be obvious whilst editing arizona_hpdet_do_id that
> you shouldn't add a return value other than 0 or -EAGAIN.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>  drivers/extcon/extcon-arizona.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
> index 0d70bf6..2313b1e 100644
> --- a/drivers/extcon/extcon-arizona.c
> +++ b/drivers/extcon/extcon-arizona.c
> @@ -476,6 +476,9 @@ static int arizona_hpdet_read(struct arizona_extcon_info *info)
>  	return val;
>  }
>  
> +/* This function should only return 0 or -EAGAIN, if other return values are
> + * added additional handling should be added in arizona_hpdet_irq.
> + */

As Lee Jones commented, you should modify this comment of arizona_hpdet_do_id() and add
the description of return value. Because arizoa_hpdet_do_id() has different meaning
between -EAGAIN and other minus value.

>  static int arizona_hpdet_do_id(struct arizona_extcon_info *info, int *reading,
>  			       bool *mic)
>  {
> @@ -591,8 +594,6 @@ static irqreturn_t arizona_hpdet_irq(int irq, void *data)
>  	ret = arizona_hpdet_do_id(info, &reading, &mic);
>  	if (ret == -EAGAIN)
>  		goto out;
> -	else if (ret < 0)
> -		goto done;
>  
>  	/* Report high impedence cables as line outputs */
>  	if (reading >= 5000)
> 

Thanks,
Chanwoo Choi
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