linux-kernel - Re: "x86: allocate space within a region top-down" causes bar0 access issue

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Message-ID: <20101217114721.04eafeca@jbarnes-desktop>
Date:	Fri, 17 Dec 2010 11:47:21 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Jon Mason <jon.mason@...r.com>
Cc:	Bjorn Helgaas <bjorn.helgaas@...com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Ramkrishna Vepa <ramkrishna.vepa@...r.com>
Subject: Re: "x86: allocate space within a region top-down" causes bar0
 access issue

On Fri, 17 Dec 2010 13:44:58 -0600
Jon Mason <jon.mason@...r.com> wrote:

> The following patch is causing problem with the vxge driver/adapter on
> HP x86-64 systems. Reads to bar0 to return 0xffffffffffffffff instead
> of their intended value.  This prevents the vxge module from loading
> by failing sanity checks in the driver for certain values in bar0.  We
> are not seeing any issues with this patch on non-HP systems in our
> lab.
> 
> Can this patch be removed from 2.6.37 until a better solution can be
> found?

Can you try my for-linus branch and see if the problem still exists
there?  It's at
git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6.git.

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center
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