linux-kernel - Re: [PATCH] staging: fieldbus: simplify devm_anybuss_host_common

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Date:   Fri, 9 Apr 2021 07:58:59 -0400
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Tian Tao <tiantao6@...ilicon.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: fieldbus: simplify devm_anybuss_host_common_probe

Hello Tian, thank you for the contribution. See below.

On Fri, Apr 9, 2021 at 4:33 AM Tian Tao <tiantao6@...ilicon.com> wrote:
>
> Use devm_add_action_or_reset() instead of devres_alloc() and
> devres_add(), which works the same. This will simplify the
> code. There is no functional changes.
>
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
> ---
>  drivers/staging/fieldbus/anybuss/host.c | 20 ++++++++------------
>  1 file changed, 8 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/staging/fieldbus/anybuss/host.c b/drivers/staging/fieldbus/anybuss/host.c
> index 549cb7d5..2924e68 100644
> --- a/drivers/staging/fieldbus/anybuss/host.c
> +++ b/drivers/staging/fieldbus/anybuss/host.c
> @@ -1406,7 +1406,7 @@ void anybuss_host_common_remove(struct anybuss_host *host)
>  }
>  EXPORT_SYMBOL_GPL(anybuss_host_common_remove);
>
> -static void host_release(struct device *dev, void *res)
> +static void host_release(void *res)
>  {
>         struct anybuss_host **dr = res;

You're expecting a double pointer as the argument here...

>
> @@ -1417,21 +1417,17 @@ struct anybuss_host * __must_check
>  devm_anybuss_host_common_probe(struct device *dev,
>                                const struct anybuss_ops *ops)
>  {
> -       struct anybuss_host **dr;
>         struct anybuss_host *host;
> -
> -       dr = devres_alloc(host_release, sizeof(struct anybuss_host *),
> -                         GFP_KERNEL);
> -       if (!dr)
> -               return ERR_PTR(-ENOMEM);
> +       int ret;
>
>         host = anybuss_host_common_probe(dev, ops);
> -       if (IS_ERR(host)) {
> -               devres_free(dr);
> +       if (IS_ERR(host))
>                 return host;
> -       }
> -       *dr = host;
> -       devres_add(dev, dr);
> +
> +       ret = devm_add_action_or_reset(dev, host_release, host);

... yet you pass in a single pointer here. Is that going to work?

> +       if (ret)
> +               return ERR_PTR(ret);
> +
>         return host;
>  }
>  EXPORT_SYMBOL_GPL(devm_anybuss_host_common_probe);
> --
> 2.7.4
>