linux-kernel - Re: [RESEND PATCH v3 4/4] fpga: region: change fpga_region

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Date:   Tue, 27 Mar 2018 13:09:26 -0700
From:   Moritz Fischer <moritz.fischer@...us.com>
To:     Alan Tull <atull@...nel.org>
Cc:     Anatolij Gustschin <agust@...x.de>,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        Joel Holdsworth <joel@...webreathe.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Joshua Clayton <stillcompiling@...il.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fpga@...r.kernel.org
Subject: Re: [RESEND PATCH v3 4/4] fpga: region: change fpga_region_register
 to have one param

Hi Alan,

On Tue, Mar 27, 2018 at 12:59 PM, Alan Tull <atull@...nel.org> wrote:
> Change fpga_region_register to only take one parameter:
>
>   int fpga_region_register(struct fpga_region *region)
>
> The parent dev is added to struct fpga_region.
>
> This make it similar to fpga_bridge_register and fpga_mgr_register
> which also just take their respective struct.
>
> The one caller of fpga_region_register is changed to alloc the
> fpga_region struct, fill it in, and pass it to the register
> function.
>
> Signed-off-by: Alan Tull <atull@...nel.org>
Acked-by: Moritz Fischer <mdf@...nel.org>
> ---
> v2: This patch added in this version of the patchset
> v3: minor changes to make diffs smaller and more obviously correct
> ---
>  Documentation/fpga/fpga-region.txt | 3 +--
>  drivers/fpga/fpga-region.c         | 8 +++++++-
>  drivers/fpga/of-fpga-region.c      | 3 ++-
>  include/linux/fpga/fpga-region.h   | 4 +++-
>  4 files changed, 13 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/fpga/fpga-region.txt b/Documentation/fpga/fpga-region.txt
> index 139a02ba1ff6..d38fa3b4154a 100644
> --- a/Documentation/fpga/fpga-region.txt
> +++ b/Documentation/fpga/fpga-region.txt
> @@ -42,8 +42,7 @@ The FPGA region API
>  To register or unregister a region:
>  -----------------------------------
>
> -       int fpga_region_register(struct device *dev,
> -                                struct fpga_region *region);
> +       int fpga_region_register(struct fpga_region *region);
>         int fpga_region_unregister(struct fpga_region *region);
>
>  An example of usage can be seen in the probe function of [3]
> diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
> index ebe1f872810d..660a91b9e246 100644
> --- a/drivers/fpga/fpga-region.c
> +++ b/drivers/fpga/fpga-region.c
> @@ -162,10 +162,16 @@ int fpga_region_program_fpga(struct fpga_region *region)
>  }
>  EXPORT_SYMBOL_GPL(fpga_region_program_fpga);
>
> -int fpga_region_register(struct device *dev, struct fpga_region *region)
> +int fpga_region_register(struct fpga_region *region)
>  {
> +       struct device *dev = region->parent;
>         int id, ret = 0;
>
> +       if (!dev) {
> +               pr_err("Attempt to register fpga region without parent\n");
> +               return -EINVAL;
> +       }
> +
>         id = ida_simple_get(&fpga_region_ida, 0, 0, GFP_KERNEL);
>         if (id < 0)
>                 return id;
> diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
> index 35e7e8c4a0cb..a7b38aafeaa7 100644
> --- a/drivers/fpga/of-fpga-region.c
> +++ b/drivers/fpga/of-fpga-region.c
> @@ -428,12 +428,13 @@ static int of_fpga_region_probe(struct platform_device *pdev)
>                 goto eprobe_mgr_put;
>         }
>
> +       region->parent = dev;
>         region->mgr = mgr;
>
>         /* Specify how to get bridges for this type of region. */
>         region->get_bridges = of_fpga_region_get_bridges;
>
> -       ret = fpga_region_register(dev, region);
> +       ret = fpga_region_register(region);
>         if (ret)
>                 goto eprobe_mgr_put;
>
> diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h
> index b6520318ab9c..423c87e3e29a 100644
> --- a/include/linux/fpga/fpga-region.h
> +++ b/include/linux/fpga/fpga-region.h
> @@ -8,6 +8,7 @@
>  /**
>   * struct fpga_region - FPGA Region structure
>   * @dev: FPGA Region device
> + * @parent: parent device
>   * @mutex: enforces exclusive reference to region
>   * @bridge_list: list of FPGA bridges specified in region
>   * @mgr: FPGA manager
> @@ -18,6 +19,7 @@
>   */
>  struct fpga_region {
>         struct device dev;
> +       struct device *parent;
>         struct mutex mutex; /* for exclusive reference to region */
>         struct list_head bridge_list;
>         struct fpga_manager *mgr;
> @@ -34,7 +36,7 @@ struct fpga_region *fpga_region_class_find(
>         int (*match)(struct device *, const void *));
>
>  int fpga_region_program_fpga(struct fpga_region *region);
> -int fpga_region_register(struct device *dev, struct fpga_region *region);
> +int fpga_region_register(struct fpga_region *region);
>  int fpga_region_unregister(struct fpga_region *region);
>
>  #endif /* _FPGA_REGION_H */
> --
> 2.14.2
>
> --
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Thanks,
Moritz