linux-kernel - Re: commit c2fe0480cd77 leads to hang on boot

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Message-ID: <717c608b-6280-45fd-bb88-eeb862a893e3@t-8ch.de>
Date: Fri, 30 Aug 2024 07:22:22 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Bert Karwatzki <spasswolf@....de>
Cc: linux-kernel@...r.kernel.org
Subject: Re: commit c2fe0480cd77 leads to hang on boot

Hi Bert,

thanks for the report.

On 2024-08-30 01:04:37+0000, Bert Karwatzki wrote:
> To look into the issue I applied the following patch to next-20240829:
> 
> diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
> index 20517448487e..ba2b0d4b1bd3 100644
> --- a/drivers/video/fbdev/efifb.c
> +++ b/drivers/video/fbdev/efifb.c
> @@ -573,6 +573,8 @@ static int efifb_probe(struct platform_device *dev)
>  		pr_err("efifb: cannot acquire aperture\n");
>  		goto err_fb_dealloc_cmap;
>  	}
> +	printk(KERN_INFO "%s: not calling devm_register_framebuffer\n", __func__);
> +	goto err_fb_dealloc_cmap;
>  	err = devm_register_framebuffer(&dev->dev, info);
>  	if (err < 0) {
>  		pr_err("efifb: cannot register framebuffer\n");
> 
> Now booting works again so the problem seems to be in devm_register_framebuffer().

What happens if you replace devm_register_framebuffer() with a plain
register_framebuffer() again?


Thomas