linux-kernel - Re: [PATCH v2 2/2] staging: greybus: remove unneeded return

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Date:   Tue, 12 Apr 2022 15:35:04 -0500
From:   Alex Elder <elder@...e.org>
To:     Jaehee Park <jhpark1013@...il.com>, johan@...nel.org
Cc:     elder@...nel.org, gregkh@...uxfoundation.org,
        greybus-dev@...ts.linaro.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, outreachy@...ts.linux.dev
Subject: Re: [PATCH v2 2/2] staging: greybus: remove unneeded return

On 4/12/22 2:59 PM, Jaehee Park wrote:
> An empty function with void return type does not need an explicit
> return. Issue found by checkpatch.
> 
> Signed-off-by: Jaehee Park <jhpark1013@...il.com>

Dan's suggestion here was to simply remove this function
entirely.  It is only used as the ->remove callback
for the soc_codec_dev_gbaudio structure.

You can see that soc_codec_dev_gbaudio is only used in the
call to devm_snd_soc_register_component() near the end of
"audio_codec.c".  When a sound component is registered
that way, the ->remove callback is optional.  You can see
that because the only place in "sound/soc/soc-component.c"
that it is referenced is snd_soc_component_remove() (as
Dan said), and it only calls the function if it the pointer
is non-null.  Allowing null function pointers in places
like this. to allow them to be optionally omitted is not
an uncommon pattern you'll see in the kernel.

Anyway, please don't just add another small patch to remove
the function.  Just replace *this* patch with one that
removes the function, and omits the assignment if its
address to soc_codec_dev_gbaudio->remove.

					-Alex

> ---
>   drivers/staging/greybus/audio_codec.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
> index 0f50d1e51e2c..3e3a16568def 100644
> --- a/drivers/staging/greybus/audio_codec.c
> +++ b/drivers/staging/greybus/audio_codec.c
> @@ -1032,7 +1032,6 @@ static int gbcodec_probe(struct snd_soc_component *comp)
>   static void gbcodec_remove(struct snd_soc_component *comp)
>   {
>   	/* Empty function for now */
> -	return;
>   }
>   
>   static int gbcodec_write(struct snd_soc_component *comp, unsigned int reg,