linux-kernel - Re: [PATCH] soc: apple: rtkit: Export non-devm init/free functions

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Message-ID: <CAOgh=FwPCJ3pDk0EUgekzdE+Y=OpyWHiWW5bo7qoX21trbMV7Q@mail.gmail.com>
Date:   Sun, 22 Jan 2023 12:16:28 +0000
From:   Eric Curtin <ecurtin@...hat.com>
To:     Asahi Lina <lina@...hilina.net>
Cc:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: apple: rtkit: Export non-devm init/free functions

On Sat, 21 Jan 2023 at 07:48, Asahi Lina <lina@...hilina.net> wrote:
>
> While we normally encourage devm usage by drivers, some consumers (and
> in particular the upcoming Rust abstractions) might want to manually
> manage memory. Export the raw functions to make this possible.
>
> Signed-off-by: Asahi Lina <lina@...hilina.net>
> ---

Signed-off-by: Eric Curtin <ecurtin@...hat.com>

Is mise le meas/Regards,

Eric Curtin

>  drivers/soc/apple/rtkit.c       | 15 ++++++++++-----
>  include/linux/soc/apple/rtkit.h | 19 +++++++++++++++++++
>  2 files changed, 29 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/soc/apple/rtkit.c b/drivers/soc/apple/rtkit.c
> index fa3cda831d2b..bb33f3cd4efd 100644
> --- a/drivers/soc/apple/rtkit.c
> +++ b/drivers/soc/apple/rtkit.c
> @@ -686,7 +686,7 @@ static int apple_rtkit_request_mbox_chan(struct apple_rtkit *rtk)
>         return mbox_start_channel(rtk->mbox_chan);
>  }
>
> -static struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
> +struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
>                                             const char *mbox_name, int mbox_idx,
>                                             const struct apple_rtkit_ops *ops)
>  {
> @@ -739,6 +739,7 @@ static struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
>         kfree(rtk);
>         return ERR_PTR(ret);
>  }
> +EXPORT_SYMBOL_GPL(apple_rtkit_init);
>
>  static int apple_rtkit_wait_for_completion(struct completion *c)
>  {
> @@ -922,10 +923,8 @@ int apple_rtkit_wake(struct apple_rtkit *rtk)
>  }
>  EXPORT_SYMBOL_GPL(apple_rtkit_wake);
>
> -static void apple_rtkit_free(void *data)
> +void apple_rtkit_free(struct apple_rtkit *rtk)
>  {
> -       struct apple_rtkit *rtk = data;
> -
>         mbox_free_channel(rtk->mbox_chan);
>         destroy_workqueue(rtk->wq);
>
> @@ -936,6 +935,12 @@ static void apple_rtkit_free(void *data)
>         kfree(rtk->syslog_msg_buffer);
>         kfree(rtk);
>  }
> +EXPORT_SYMBOL_GPL(apple_rtkit_free);
> +
> +static void apple_rtkit_free_wrapper(void *data)
> +{
> +       apple_rtkit_free(data);
> +}
>
>  struct apple_rtkit *devm_apple_rtkit_init(struct device *dev, void *cookie,
>                                           const char *mbox_name, int mbox_idx,
> @@ -948,7 +953,7 @@ struct apple_rtkit *devm_apple_rtkit_init(struct device *dev, void *cookie,
>         if (IS_ERR(rtk))
>                 return rtk;
>
> -       ret = devm_add_action_or_reset(dev, apple_rtkit_free, rtk);
> +       ret = devm_add_action_or_reset(dev, apple_rtkit_free_wrapper, rtk);
>         if (ret)
>                 return ERR_PTR(ret);
>
> diff --git a/include/linux/soc/apple/rtkit.h b/include/linux/soc/apple/rtkit.h
> index 2d837aa7b91f..62bfa37b5adb 100644
> --- a/include/linux/soc/apple/rtkit.h
> +++ b/include/linux/soc/apple/rtkit.h
> @@ -77,6 +77,25 @@ struct apple_rtkit *devm_apple_rtkit_init(struct device *dev, void *cookie,
>                                           const char *mbox_name, int mbox_idx,
>                                           const struct apple_rtkit_ops *ops);
>
> +/*
> + * Non-devm version of devm_apple_rtkit_init. Must be freed with
> + * apple_rtkit_free.
> + *
> + * @dev:         Pointer to the device node this coprocessor is assocated with
> + * @cookie:      opaque cookie passed to all functions defined in rtkit_ops
> + * @mbox_name:   mailbox name used to communicate with the co-processor
> + * @mbox_idx:    mailbox index to be used if mbox_name is NULL
> + * @ops:         pointer to rtkit_ops to be used for this co-processor
> + */
> +struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
> +                                         const char *mbox_name, int mbox_idx,
> +                                         const struct apple_rtkit_ops *ops);
> +
> +/*
> + * Free an instance of apple_rtkit.
> + */
> +void apple_rtkit_free(struct apple_rtkit *rtk);
> +
>  /*
>   * Reinitialize internal structures. Must only be called with the co-processor
>   * is held in reset.
> --
> 2.35.1
>
>