linux-kernel - Re: [Stable-review] [PATCH 15/52] drm: remove address mask param for drm_pci

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Date:	Thu, 14 Jan 2010 23:38:48 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, Zhenyu Wang <zhenyu.z.wang@...el.com>,
	Zhenyu Wang <zhenyuw@...ux.intel.com>,
	Dave Airlie <airlied@...hat.com>, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [Stable-review] [PATCH 15/52] drm: remove address mask param
 for drm_pci_alloc()

On Thu, 2010-01-14 at 14:26 -0800, Greg Kroah-Hartman wrote:
> From: Zhenyu Wang <zhenyu.z.wang@...el.com>
> 
> commit e6be8d9d17bd44061116f601fe2609b3ace7aa69 upstream.
> 
> drm_pci_alloc() has input of address mask for setting pci dma
> mask on the device, which should be properly setup by drm driver.
> And leave it as a param for drm_pci_alloc() would cause confusion
> or mistake would corrupt the correct dma mask setting, as seen on
> intel hw which set wrong dma mask for hw status page. So remove
> it from drm_pci_alloc() function.

Based on comments at <http://bugs.freedesktop.org/show_bug.cgi?id=25510>
I think we also need this fix:

commit fc61901373987ad61851ed001fe971f3ee8d96a3
Author: David Woodhouse <dwmw2@...radead.org>
Date:   Wed Dec 2 11:00:05 2009 +0000

    agp/intel-agp: Clear entire GTT on startup

Ben.

-- 
Ben Hutchings
The generation of random numbers is too important to be left to chance.
                                                            - Robert Coveyou

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