linux-kernel - Re: [PATCH] dio: Have dio_bus_match() callback take a const *

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Message-ID: <2024071031-afterglow-porridge-de26@gregkh>
Date: Wed, 10 Jul 2024 09:47:47 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dio: Have dio_bus_match() callback take a const *

On Wed, Jul 10, 2024 at 09:44:52AM +0200, Geert Uytterhoeven wrote:
> drivers/dio/dio-driver.c:128:11: error: initialization of ‘int (*)(struct device *, const struct device_driver *)’ from incompatible pointer type ‘int (*)(struct device *, struct device_driver *)’ [-Werror=incompatible-pointer-types]
>   128 |  .match = dio_bus_match,
>       |           ^~~~~~~~~~~~~
> drivers/dio/dio-driver.c:128:11: note: (near initialization for ‘dio_bus_type.match’)
> 
> Reported-by: noreply@...erman.id.au
> Fixes: d69d804845985c29 ("driver core: have match() callback in struct bus_type take a const *")
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
>  drivers/dio/dio-driver.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dio/dio-driver.c b/drivers/dio/dio-driver.c
> index 2d9fa6011945d88b..12fa2d209dab9d3c 100644
> --- a/drivers/dio/dio-driver.c
> +++ b/drivers/dio/dio-driver.c
> @@ -110,10 +110,10 @@ void dio_unregister_driver(struct dio_driver *drv)
>   *  and 0 if there is no match.
>   */
>  
> -static int dio_bus_match(struct device *dev, struct device_driver *drv)
> +static int dio_bus_match(struct device *dev, const struct device_driver *drv)
>  {
>  	struct dio_dev *d = to_dio_dev(dev);
> -	struct dio_driver *dio_drv = to_dio_driver(drv);
> +	const struct dio_driver *dio_drv = to_dio_driver(drv);

Same here, to_dio_driver() should be changed to use container_of_const()

thanks,

greg k-h