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Date:   Tue, 4 Apr 2017 14:39:05 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Lee Jones <lee.jones@...aro.org>, hans.verkuil@...co.com,
        mchehab@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...inux.com, patrice.chotard@...com,
        linux-media@...r.kernel.org, benjamin.gaignard@...com
Subject: Re: [PATCH 1/2] [media] cec: Move capability check inside #if

On 04/04/2017 02:32 PM, Lee Jones wrote:
> If CONFIG_RC_CORE is not enabled then none of the RC code will be
> executed anyway, so we're placing the capability check inside the
> 
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/media/cec/cec-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/cec/cec-core.c b/drivers/media/cec/cec-core.c
> index 37217e2..06a312c 100644
> --- a/drivers/media/cec/cec-core.c
> +++ b/drivers/media/cec/cec-core.c
> @@ -234,10 +234,10 @@ struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
>  		return ERR_PTR(res);
>  	}
>  
> +#if IS_REACHABLE(CONFIG_RC_CORE)
>  	if (!(caps & CEC_CAP_RC))
>  		return adap;
>  
> -#if IS_REACHABLE(CONFIG_RC_CORE)
>  	/* Prepare the RC input device */
>  	adap->rc = rc_allocate_device(RC_DRIVER_SCANCODE);
>  	if (!adap->rc) {
> 

Not true, there is an #else further down.

That said, this code is clearly a bit confusing.

It would be better if at the beginning of the function we'd have this:

#if !IS_REACHABLE(CONFIG_RC_CORE)
	caps &= ~CEC_CAP_RC;
#endif

and then drop the #else bit and (as you do in this patch) move the #if up.

Can you make a new patch for this?

Thanks!

	Hans


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