linux-kernel - Re: [PATCH v2 02/16] i3c: move dev_to_i3cdev() to use container_of

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Message-ID: <Y766KHAN9oeQX1At@mail.local>
Date:   Wed, 11 Jan 2023 14:31:20 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-i3c@...ts.infradead.org
Subject: Re: [PATCH v2 02/16] i3c: move dev_to_i3cdev() to use
 container_of_const()

On 11/01/2023 12:30:04+0100, Greg Kroah-Hartman wrote:
> The driver core is changing to pass some pointers as const, so move
> dev_to_i3cdev() to use container_of_const() to handle this change.
> dev_to_i3cdev() now properly keeps the const-ness of the pointer passed
> into it, while as before it could be lost.
> 
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Cc: linux-i3c@...ts.infradead.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Acked-by: Alexandre Belloni <alexandre.belloni@...tlin.com>

> ---
>  drivers/i3c/device.c       | 12 ------------
>  include/linux/i3c/device.h |  9 ++++++++-
>  2 files changed, 8 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/i3c/device.c b/drivers/i3c/device.c
> index 9762630b917e..d111499061b2 100644
> --- a/drivers/i3c/device.c
> +++ b/drivers/i3c/device.c
> @@ -208,18 +208,6 @@ struct device *i3cdev_to_dev(struct i3c_device *i3cdev)
>  }
>  EXPORT_SYMBOL_GPL(i3cdev_to_dev);
>  
> -/**
> - * dev_to_i3cdev() - Returns the I3C device containing @dev
> - * @dev: device object
> - *
> - * Return: a pointer to an I3C device object.
> - */
> -struct i3c_device *dev_to_i3cdev(struct device *dev)
> -{
> -	return container_of(dev, struct i3c_device, dev);
> -}
> -EXPORT_SYMBOL_GPL(dev_to_i3cdev);
> -
>  /**
>   * i3c_device_match_id() - Returns the i3c_device_id entry matching @i3cdev
>   * @i3cdev: I3C device
> diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
> index 1c997abe868c..68b558929aec 100644
> --- a/include/linux/i3c/device.h
> +++ b/include/linux/i3c/device.h
> @@ -186,7 +186,14 @@ static inline struct i3c_driver *drv_to_i3cdrv(struct device_driver *drv)
>  }
>  
>  struct device *i3cdev_to_dev(struct i3c_device *i3cdev);
> -struct i3c_device *dev_to_i3cdev(struct device *dev);
> +
> +/**
> + * dev_to_i3cdev() - Returns the I3C device containing @dev
> + * @dev: device object
> + *
> + * Return: a pointer to an I3C device object.
> + */
> +#define dev_to_i3cdev(__dev)	container_of_const(__dev, struct i3c_device, dev)
>  
>  const struct i3c_device_id *
>  i3c_device_match_id(struct i3c_device *i3cdev,
> -- 
> 2.39.0
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com