linux-kernel - Re: [PATCH v5] fpga: region: add owner module and take its refcount

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Message-ID: <ZhnviXAgnTdzUyV4@yilunxu-OptiPlex-7050>
Date: Sat, 13 Apr 2024 10:35:53 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
To: Marco Pagani <marpagan@...hat.com>
Cc: Moritz Fischer <mdf@...nel.org>, Wu Hao <hao.wu@...el.com>,
	Xu Yilun <yilun.xu@...el.com>, Tom Rix <trix@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Tull <atull@...nsource.altera.com>,
	Russ Weight <russ.weight@...ux.dev>, linux-fpga@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] fpga: region: add owner module and take its refcount

>  /**
> - * fpga_region_register_full - create and register an FPGA Region device
> + * __fpga_region_register_full - create and register an FPGA Region device
>   * @parent: device parent
>   * @info: parameters for FPGA Region
> + * @owner: owner module containing the get_bridges function

This is too specific and easily get unaligned if we add another
callback. How about "module containing the region ops"?

>   *
>   * Return: struct fpga_region or ERR_PTR()
>   */
>  struct fpga_region *
> -fpga_region_register_full(struct device *parent, const struct fpga_region_info *info)
> +__fpga_region_register_full(struct device *parent, const struct fpga_region_info *info,
> +			    struct module *owner)
>  {
>  	struct fpga_region *region;
>  	int id, ret = 0;
> @@ -213,6 +215,7 @@ fpga_region_register_full(struct device *parent, const struct fpga_region_info *
>  	region->compat_id = info->compat_id;
>  	region->priv = info->priv;
>  	region->get_bridges = info->get_bridges;
> +	region->ops_owner = owner;
>  
>  	mutex_init(&region->mutex);
>  	INIT_LIST_HEAD(&region->bridge_list);
> @@ -241,13 +244,14 @@ fpga_region_register_full(struct device *parent, const struct fpga_region_info *
>  
>  	return ERR_PTR(ret);
>  }
> -EXPORT_SYMBOL_GPL(fpga_region_register_full);
> +EXPORT_SYMBOL_GPL(__fpga_region_register_full);
>  
>  /**
> - * fpga_region_register - create and register an FPGA Region device
> + * __fpga_region_register - create and register an FPGA Region device
>   * @parent: device parent
>   * @mgr: manager that programs this region
>   * @get_bridges: optional function to get bridges to a list
> + * @owner: owner module containing get_bridges function

ditto

>   *
>   * This simple version of the register function should be sufficient for most users.
>   * The fpga_region_register_full() function is available for users that need to
> @@ -256,17 +260,17 @@ EXPORT_SYMBOL_GPL(fpga_region_register_full);
>   * Return: struct fpga_region or ERR_PTR()
>   */
>  struct fpga_region *
> -fpga_region_register(struct device *parent, struct fpga_manager *mgr,
> -		     int (*get_bridges)(struct fpga_region *))
> +__fpga_region_register(struct device *parent, struct fpga_manager *mgr,
> +		       int (*get_bridges)(struct fpga_region *), struct module *owner)
>  {
>  	struct fpga_region_info info = { 0 };
>  
>  	info.mgr = mgr;
>  	info.get_bridges = get_bridges;
>  
> -	return fpga_region_register_full(parent, &info);
> +	return __fpga_region_register_full(parent, &info, owner);
>  }
> -EXPORT_SYMBOL_GPL(fpga_region_register);
> +EXPORT_SYMBOL_GPL(__fpga_region_register);
>  
>  /**
>   * fpga_region_unregister - unregister an FPGA region
> diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h
> index 9d4d32909340..5fbc05fe70a6 100644
> --- a/include/linux/fpga/fpga-region.h
> +++ b/include/linux/fpga/fpga-region.h
> @@ -36,6 +36,7 @@ struct fpga_region_info {
>   * @mgr: FPGA manager
>   * @info: FPGA image info
>   * @compat_id: FPGA region id for compatibility check.
> + * @ops_owner: module containing the get_bridges function

ditto

Thanks,
Yilun

>   * @priv: private data
>   * @get_bridges: optional function to get bridges to a list
>   */
> @@ -46,6 +47,7 @@ struct fpga_region {
>  	struct fpga_manager *mgr;
>  	struct fpga_image_info *info;
>  	struct fpga_compat_id *compat_id;
> +	struct module *ops_owner;
>  	void *priv;
>  	int (*get_bridges)(struct fpga_region *region);
>  };