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

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Date:   Mon, 10 Jul 2023 09:41:10 +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 Mon, Jul 10, 2023 at 9:25 AM Yangtao Li <frank.li@...o.com> wrote:
> On 2023/7/10 15:10, Geert Uytterhoeven wrote:
> > [你通常不会收到来自 geert@...ux-m68k.org 的电子邮件。请访问 https://aka.ms/LearnAboutSenderIdentification，以了解这一点为什么很重要]
> > 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.
>
>
> IIUC, split this patch into two, remove release_mem_region in one and
>
> mark it as Fixes: b083c22d51148f3d ("video: fbdev: imxfb: Convert
> request_mem_region +
>
> ioremap to devm_ioremap_resource")?

Exactly.  But as Helge has already applied this patch to his tree, we have
to check with him if this is still feasible...

> > 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:

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