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

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Date:   Mon, 10 Jul 2023 15:25:22 +0800
From:   Yangtao Li <frank.li@...o.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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 Geert,

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]
>
> 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.


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")?


MBR,

Yangtao


>
> 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