linux-kernel - Re: [RFC PATCH] efi/fb: Convert PCI bus address to resource if translated by the bridge

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Message-ID: <9f8ea8f6-6005-1b46-4d75-4f89e04ad9c1@codeaurora.org>
Date:   Wed, 16 May 2018 14:41:12 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Timur Tabi <timur@...eaurora.org>, linux-pci@...r.kernel.org
Cc:     linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Peter Jones <pjones@...hat.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        "open list:EFIFB FRAMEBUFFER DRIVER" <linux-fbdev@...r.kernel.org>,
        "open list:FRAMEBUFFER LAYER" <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] efi/fb: Convert PCI bus address to resource if
 translated by the bridge

On 5/16/2018 2:31 PM, Timur Tabi wrote:
> On 05/16/2018 01:23 PM, Sinan Kaya wrote:
>> +        win_start = window->res->start - window->offset;
> 
> Can you guarantee that window->res->start is always >= window->offset?
> 

Resource offset is generally 0 when not translating or a positive number
that you subtract from the resource start to reach to the translating window.

Having a bigger offset than resource start should be considered a BIOS bug.

>> +        win_size = window->res->end - window->res->start + 1;
> 
> Use resource_size() instead.
> 

I'll fix it.

-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.