linux-kernel - Re: [PATCH v7 02/12] rpmsg: Create the rpmsg class in core instead of in rpmsg char

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Message-ID: <Yal+R7nd1tuBHioi@builder.lan>
Date:   Thu, 2 Dec 2021 20:17:43 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com, julien.massot@....bzh
Subject: Re: [PATCH v7 02/12] rpmsg: Create the rpmsg class in core instead
 of in rpmsg char

On Mon 08 Nov 08:19 CST 2021, Arnaud Pouliquen wrote:

> Migrate the creation of the rpmsg class from the rpmsg_char
> to the core that the class is usable by the rpmsg_char and
> the futur rpmsg_ctrl module.
> 
> Suggested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
> Update vs previous revision:
> - remove rpmsg_get_class API and export the rpmsg_class in rpmsg_internal.h
> ---
>  drivers/rpmsg/rpmsg_char.c     | 10 ----------
>  drivers/rpmsg/rpmsg_core.c     | 15 +++++++++++++--
>  drivers/rpmsg/rpmsg_internal.h |  2 ++
>  3 files changed, 15 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
> index 44934d7fa3c4..8ab5ac23850c 100644
> --- a/drivers/rpmsg/rpmsg_char.c
> +++ b/drivers/rpmsg/rpmsg_char.c
> @@ -29,7 +29,6 @@
>  #define RPMSG_DEV_MAX	(MINORMASK + 1)
>  
>  static dev_t rpmsg_major;
> -static struct class *rpmsg_class;
>  
>  static DEFINE_IDA(rpmsg_ctrl_ida);
>  static DEFINE_IDA(rpmsg_ept_ida);
> @@ -559,17 +558,9 @@ static int rpmsg_chrdev_init(void)
>  		return ret;
>  	}
>  
> -	rpmsg_class = class_create(THIS_MODULE, "rpmsg");
> -	if (IS_ERR(rpmsg_class)) {
> -		pr_err("failed to create rpmsg class\n");
> -		unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
> -		return PTR_ERR(rpmsg_class);
> -	}
> -
>  	ret = register_rpmsg_driver(&rpmsg_chrdev_driver);
>  	if (ret < 0) {
>  		pr_err("rpmsgchr: failed to register rpmsg driver\n");
> -		class_destroy(rpmsg_class);
>  		unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
>  	}
>  
> @@ -580,7 +571,6 @@ postcore_initcall(rpmsg_chrdev_init);
>  static void rpmsg_chrdev_exit(void)
>  {
>  	unregister_rpmsg_driver(&rpmsg_chrdev_driver);
> -	class_destroy(rpmsg_class);
>  	unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
>  }
>  module_exit(rpmsg_chrdev_exit);
> diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
> index 9151836190ce..45227c864aa2 100644
> --- a/drivers/rpmsg/rpmsg_core.c
> +++ b/drivers/rpmsg/rpmsg_core.c
> @@ -20,6 +20,9 @@
>  
>  #include "rpmsg_internal.h"
>  
> +struct class *rpmsg_class;
> +EXPORT_SYMBOL(rpmsg_class);
> +
>  /**
>   * rpmsg_create_channel() - create a new rpmsg channel
>   * using its name and address info.
> @@ -629,10 +632,17 @@ static int __init rpmsg_init(void)
>  {
>  	int ret;
>  
> +	rpmsg_class = class_create(THIS_MODULE, "rpmsg");
> +	if (IS_ERR(rpmsg_class)) {
> +		pr_err("failed to create rpmsg class\n");
> +		return PTR_ERR(rpmsg_class);
> +	}
> +
>  	ret = bus_register(&rpmsg_bus);
> -	if (ret)
> +	if (ret) {
>  		pr_err("failed to register rpmsg bus: %d\n", ret);
> -
> +		class_destroy(rpmsg_class);
> +	}
>  	return ret;
>  }
>  postcore_initcall(rpmsg_init);
> @@ -640,6 +650,7 @@ postcore_initcall(rpmsg_init);
>  static void __exit rpmsg_fini(void)
>  {
>  	bus_unregister(&rpmsg_bus);
> +	class_destroy(rpmsg_class);
>  }
>  module_exit(rpmsg_fini);
>  
> diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
> index a76c344253bf..1b6f998e1a4a 100644
> --- a/drivers/rpmsg/rpmsg_internal.h
> +++ b/drivers/rpmsg/rpmsg_internal.h
> @@ -18,6 +18,8 @@
>  #define to_rpmsg_device(d) container_of(d, struct rpmsg_device, dev)
>  #define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
>  
> +extern struct class *rpmsg_class;
> +
>  /**
>   * struct rpmsg_device_ops - indirection table for the rpmsg_device operations
>   * @create_channel:	create backend-specific channel, optional
> -- 
> 2.17.1
>