linux-kernel - Re: [PATCH 2/4] efi/x86: move efi bgrt init code to early init code

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Message-ID: <20170112095649.GA5045@dhcp-128-65.nay.redhat.com>
Date:   Thu, 12 Jan 2017 17:56:49 +0800
From:   Dave Young <dyoung@...hat.com>
To:     Matt Fleming <matt@...eblueprint.co.uk>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, Nicolai Stange <nicstange@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, hpa@...or.com,
        Dan Williams <dan.j.williams@...el.com>,
        mika.penttila@...tfour.com, bhsharma@...hat.com
Subject: Re: [PATCH 2/4] efi/x86: move efi bgrt init code to early init code

[snip]
> --- linux-x86.orig/drivers/acpi/bgrt.c
> +++ linux-x86/drivers/acpi/bgrt.c

[snip]
>  
> @@ -84,9 +85,17 @@ static int __init bgrt_init(void)
>  {
>  	int ret;
>  
> -	if (!bgrt_image)
> +	if (!bgrt_tab.image_address)
>  		return -ENODEV;
>  
> +	bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
> +			      MEMREMAP_WB);
> +	if (!bgrt_image) {
> +		pr_notice("Ignoring BGRT: failed to map image memory\n");
> +		bgrt_image = NULL;
> +		return -ENOMEM;
> +	}
> +

Oops, later error path need unmap bgrt_image, will update in next
version after collecting more comments.

Also bgrt_image = NULL is useless, will drop it.

>  	bin_attr_image.private = bgrt_image;
>  	bin_attr_image.size = bgrt_image_size;
>  

Thanks
Dave