linux-kernel - Re: [PATCH] staging: greybus: codecs: use dedicated list iterator variable

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Date:   Tue, 22 Mar 2022 00:08:07 +0530
From:   Vaibhav Agarwal <vaibhav.sr@...il.com>
To:     Jakob Koschel <jakobkoschel@...il.com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        "moderated list:GREYBUS SUBSYSTEM" <greybus-dev@...ts.linaro.org>,
        linux-staging@...ts.linux.dev, Mark Greer <mgreer@...malcreek.com>,
        Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mike Rapoport <rppt@...nel.org>,
        Brian Johannesmeyer <bjohannesmeyer@...il.com>,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>
Subject: Re: [PATCH] staging: greybus: codecs: use dedicated list iterator variable

On Mon, Mar 21, 2022 at 6:07 PM Jakob Koschel <jakobkoschel@...il.com> wrote:
>
> In preparation to limit the scope of the list iterator to the list
> traversal loop, use a dedicated pointer to point to the found element [1].
>
> Link: https://lore.kernel.org/all/YhdfEIwI4EdtHdym@kroah.com/
> Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
> ---
>  drivers/staging/greybus/audio_codec.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
> index b589cf6b1d03..a446d6455fbd 100644
> --- a/drivers/staging/greybus/audio_codec.c
> +++ b/drivers/staging/greybus/audio_codec.c
> @@ -497,7 +497,7 @@ static int gbcodec_prepare(struct snd_pcm_substream *substream,
>                            struct snd_soc_dai *dai)
>  {
>         int ret;
> -       struct gbaudio_module_info *module;
> +       struct gbaudio_module_info *module = NULL, *iter;
>         struct gbaudio_data_connection *data;
>         struct gb_bundle *bundle;
>         struct gbaudio_codec_info *codec = dev_get_drvdata(dai->dev);
> @@ -511,11 +511,13 @@ static int gbcodec_prepare(struct snd_pcm_substream *substream,
>                 return -ENODEV;
>         }
>
> -       list_for_each_entry(module, &codec->module_list, list) {
> +       list_for_each_entry(iter, &codec->module_list, list) {
>                 /* find the dai */
> -               data = find_data(module, dai->id);
> -               if (data)
> +               data = find_data(iter, dai->id);
> +               if (data) {
> +                       module = iter;
>                         break;
> +               }
>         }
>         if (!data) {
>                 dev_err(dai->dev, "DATA connection missing\n");
> @@ -563,7 +565,7 @@ static int gbcodec_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
>  {
>         int ret;
>         struct gbaudio_data_connection *data;
> -       struct gbaudio_module_info *module;
> +       struct gbaudio_module_info *module = NULL, *iter;
>         struct gb_bundle *bundle;
>         struct gbaudio_codec_info *codec = dev_get_drvdata(dai->dev);
>         struct gbaudio_stream_params *params;
> @@ -592,11 +594,13 @@ static int gbcodec_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
>                 return ret;
>         }
>
> -       list_for_each_entry(module, &codec->module_list, list) {
> +       list_for_each_entry(iter, &codec->module_list, list) {
>                 /* find the dai */
> -               data = find_data(module, dai->id);
> -               if (data)
> +               data = find_data(iter, dai->id);
> +               if (data) {
> +                       module = iter;
>                         break;
> +               }
>         }
>         if (!data) {
>                 dev_err(dai->dev, "%s:%s DATA connection missing\n",
>
> base-commit: f443e374ae131c168a065ea1748feac6b2e76613

Thanks for sharing this patch Jakob.
Reviewed-by: Vaibhav Agarwal <vaibhav.sr@...il.com>

> --
> 2.25.1
>