linux-kernel - Re: [PATCH] pnp: replace deprecated __check_region to request

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Message-ID: <CANxBZFpjtGyk3CO0ViFJF8em_hBFLq7tErjMJrcq5vC7n9cy4g@mail.gmail.com>
Date:	Fri, 12 Aug 2011 12:03:34 +0800
From:	Wang Shaoyan <stufever@...il.com>
To:	Adam M Belay <abelay@....edu>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
	Wang Shaoyan <wangshaoyan.pt@...bao.com>,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH] pnp: replace deprecated __check_region to request_region

Hi Adam,

I can understand your worry, but back to beginning, just as the
subject of the patch: "replace deprecated __check_region to
request_region", I think this patch is still need, although it can't
solve the problems both you guys mentioned. Do you agree it?

2011/8/12 Adam M Belay <abelay@....edu>:
> Hi Wang,
>
> Yes, I think your description of the race condition is right. However, as
> Bjorn
> mentioned, there are many x86 init paths that will try to reserve the same
> resources as those reported by pnp/acpi. There needs to be a better way to
> coordinate legacy device enumeration. Otherwise, the request_region() calls
> could fail when there isn't an actual resource conflict.
>
> IF we could find a good way to clean up the legacy users of request_region()
> then we could probably make pnp behave more like pci with regard to resource
> reservations.
>
> Cheers,
> Adam


-- 
Wang Shaoyan
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