linux-kernel - Re: [PATCH] fbdev: imxfb: Convert to devm_platform_ioremap

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Message-ID: <CAMuHMdWrBY1+JDuwODyqLrwJJivt=ewCOKfK41xq+0Hpaf8akQ@mail.gmail.com>
Date:   Mon, 10 Jul 2023 09:10:26 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Yangtao Li <frank.li@...o.com>
Cc:     Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Helge Deller <deller@....de>, Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-fbdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH] fbdev: imxfb: Convert to devm_platform_ioremap_resource()

Hi Yangtao,

On Tue, Jul 4, 2023 at 11:38 AM Yangtao Li <frank.li@...o.com> wrote:
> Use devm_platform_ioremap_resource() to simplify code.
>
> Signed-off-by: Yangtao Li <frank.li@...o.com>

Thanks for your patch, which is now commit c1cd7a7a231a26c6 ("fbdev:
imxfb: Convert to devm_platform_ioremap_resource()") in fbdev/for-next

> --- a/drivers/video/fbdev/imxfb.c
> +++ b/drivers/video/fbdev/imxfb.c
> @@ -868,7 +868,6 @@ static int imxfb_probe(struct platform_device *pdev)
>         struct imxfb_info *fbi;
>         struct lcd_device *lcd;
>         struct fb_info *info;
> -       struct resource *res;
>         struct imx_fb_videomode *m;
>         const struct of_device_id *of_id;
>         struct device_node *display_np;
> @@ -885,10 +884,6 @@ static int imxfb_probe(struct platform_device *pdev)
>         if (of_id)
>                 pdev->id_entry = of_id->data;
>
> -       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -       if (!res)
> -               return -ENODEV;
> -
>         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
>         if (!info)
>                 return -ENOMEM;
> @@ -970,7 +965,7 @@ static int imxfb_probe(struct platform_device *pdev)
>                 goto failed_getclock;
>         }
>
> -       fbi->regs = devm_ioremap_resource(&pdev->dev, res);
> +       fbi->regs = devm_platform_ioremap_resource(pdev, 0);
>         if (IS_ERR(fbi->regs)) {
>                 ret = PTR_ERR(fbi->regs);
>                 goto failed_ioremap;
> @@ -1043,7 +1038,6 @@ static int imxfb_probe(struct platform_device *pdev)
>  failed_map:
>  failed_ioremap:
>  failed_getclock:
> -       release_mem_region(res->start, resource_size(res));

This part is not directly related, but a bug fix for commit
b083c22d51148f3d ("video: fbdev: imxfb: Convert request_mem_region +
ioremap to devm_ioremap_resource") in v6.0.

Please do not mix bug fixes with other changes.
The stable teams want to backport only bugfixes .

>  failed_of_parse:
>         kfree(info->pseudo_palette);
>  failed_init:
> --
> 2.39.0

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds