linux-kernel - Re: [PATCH 4/7] agp/ati: Return error from ati_create_page

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Message-ID: <6a73a2c8-1055-ebd5-7f12-dd34e86b7f2d@gmx.de>
Date:   Tue, 30 Nov 2021 11:11:06 +0100
From:   Helge Deller <deller@....de>
To:     Thomas Zimmermann <tzimmermann@...e.de>, airlied@...ux.ie,
        daniel.vetter@...ll.ch, arnd@...db.de, gregkh@...uxfoundation.org,
        James.Bottomley@...senPartnership.com
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7] agp/ati: Return error from ati_create_page_map()

On 11/12/21 15:16, Thomas Zimmermann wrote:
> Fix the compiler warning
>
>   drivers/char/agp/ati-agp.c: In function 'ati_create_page_map':
>   drivers/char/agp/ati-agp.c:58:16: warning: variable 'err' set but not used [-Wunused-but-set-variable]
>     58 |         int i, err = 0;
>
> by returing the error to the caller.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
> ---
>  drivers/char/agp/ati-agp.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/agp/ati-agp.c b/drivers/char/agp/ati-agp.c
> index 857b37141a07..785cc1ecf4e0 100644
> --- a/drivers/char/agp/ati-agp.c
> +++ b/drivers/char/agp/ati-agp.c
> @@ -55,7 +55,7 @@ static struct _ati_generic_private {
>
>  static int ati_create_page_map(struct ati_page_map *page_map)
>  {
> -	int i, err = 0;
> +	int i, err;
>
>  	page_map->real = (unsigned long *) __get_free_page(GFP_KERNEL);
>  	if (page_map->real == NULL)
> @@ -63,6 +63,8 @@ static int ati_create_page_map(struct ati_page_map *page_map)
>
>  	set_memory_uc((unsigned long)page_map->real, 1);
>  	err = map_page_into_agp(virt_to_page(page_map->real));
> +	if (err)
> +		goto err_free_page;

I'd suggest to not use goto here, but instead simply fold
in the free_page() and return.


>  	page_map->remapped = page_map->real;
>
>  	for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++) {
> @@ -71,6 +73,10 @@ static int ati_create_page_map(struct ati_page_map *page_map)
>  	}
>
>  	return 0;
> +
> +err_free_page:
> +	free_page((unsigned long)page_map->real);
> +	return err;
>  }
>
>
>