linux-kernel - Re: [PATCH 3/3] driver core: remove devm_device_add

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Message-ID: <CAJZ5v0jsK+o=auHMwcOnqamLS1_cw6D9YRJ4YDs2n-46R=zGYw@mail.gmail.com>
Date:   Tue, 4 Jul 2023 18:05:53 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-hwmon@...r.kernel.org, linux@...ck-us.net,
        samsagax@...il.com, linux-kernel@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH 3/3] driver core: remove devm_device_add_groups()

On Tue, Jul 4, 2023 at 3:17 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> There is no more in-kernel users of this function, and no driver should
> ever be using it, so remove it from the kernel.
>
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Acked-by: Rafael J. Wysocki <rafael@...nel.org>

> ---
>  drivers/base/core.c    | 45 ------------------------------------------
>  include/linux/device.h |  2 --
>  2 files changed, 47 deletions(-)
>
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 3dff5037943e..94187c0b577d 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -2748,15 +2748,6 @@ static void devm_attr_group_remove(struct device *dev, void *res)
>         sysfs_remove_group(&dev->kobj, group);
>  }
>
> -static void devm_attr_groups_remove(struct device *dev, void *res)
> -{
> -       union device_attr_group_devres *devres = res;
> -       const struct attribute_group **groups = devres->groups;
> -
> -       dev_dbg(dev, "%s: removing groups %p\n", __func__, groups);
> -       sysfs_remove_groups(&dev->kobj, groups);
> -}
> -
>  /**
>   * devm_device_add_group - given a device, create a managed attribute group
>   * @dev:       The device to create the group for
> @@ -2789,42 +2780,6 @@ int devm_device_add_group(struct device *dev, const struct attribute_group *grp)
>  }
>  EXPORT_SYMBOL_GPL(devm_device_add_group);
>
> -/**
> - * devm_device_add_groups - create a bunch of managed attribute groups
> - * @dev:       The device to create the group for
> - * @groups:    The attribute groups to create, NULL terminated
> - *
> - * This function creates a bunch of managed attribute groups.  If an error
> - * occurs when creating a group, all previously created groups will be
> - * removed, unwinding everything back to the original state when this
> - * function was called.  It will explicitly warn and error if any of the
> - * attribute files being created already exist.
> - *
> - * Returns 0 on success or error code from sysfs_create_group on failure.
> - */
> -int devm_device_add_groups(struct device *dev,
> -                          const struct attribute_group **groups)
> -{
> -       union device_attr_group_devres *devres;
> -       int error;
> -
> -       devres = devres_alloc(devm_attr_groups_remove,
> -                             sizeof(*devres), GFP_KERNEL);
> -       if (!devres)
> -               return -ENOMEM;
> -
> -       error = sysfs_create_groups(&dev->kobj, groups);
> -       if (error) {
> -               devres_free(devres);
> -               return error;
> -       }
> -
> -       devres->groups = groups;
> -       devres_add(dev, devres);
> -       return 0;
> -}
> -EXPORT_SYMBOL_GPL(devm_device_add_groups);
> -
>  static int device_add_attrs(struct device *dev)
>  {
>         const struct class *class = dev->class;
> diff --git a/include/linux/device.h b/include/linux/device.h
> index 66c13965153d..6dd087e4223d 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -1164,8 +1164,6 @@ static inline void device_remove_group(struct device *dev,
>         return device_remove_groups(dev, groups);
>  }
>
> -int __must_check devm_device_add_groups(struct device *dev,
> -                                       const struct attribute_group **groups);
>  int __must_check devm_device_add_group(struct device *dev,
>                                        const struct attribute_group *grp);
>
> --
> 2.41.0
>