From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Mon, 28 Dec 2009 09:11:56 +0000 (+0900)
Subject: x86/agp: Fix agp_amd64_init() initialization with CONFIG_GART_IOMMU enabled
X-Git-Tag: v2.6.33-rc3~28^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f405d2c02395a74d3883bd03ded36457aa3697ad;p=pandora-kernel.git

x86/agp: Fix agp_amd64_init() initialization with CONFIG_GART_IOMMU enabled

with CONFIG_GART_IOMMU enabled drivers/char/agp/amd64-agp.c has:

 #ifndef CONFIG_GART_IOMMU
 module_init(agp_amd64_init);
 module_exit(agp_amd64_cleanup);
 #endif

agp_amd64_init() was called via gart_iommu_init with
CONFIG_GART_IOMMU=y agp_amd64_init() was called via module_init
with CONFIG_GART_IOMMU=n

The commit 75f1cdf1dda92cae037ec848ae63690d91913eac changes the
x86 dma initialization routine: gart_iommu_init() is called only
when GART IOMMU is detected. So when GART IOMMU isn't detected,
agp_amd64_init isn't called.

Marin Mitov reported this issue:

 http://marc.info/?l=linux-kernel&m=126192729110083&w=2

With this patch, agp_amd64_init() is always called via
module_init (the above ifndef is removed). If agp_amd64_init()
is called via gart_iommu_init() earlier, agp_amd64_init()
finishes without doing anything (when it is called via
module_init).

Reported-by: Marin Mitov <mitov@issp.bas.bg>
Tested-by: Marin Mitov <mitov@issp.bas.bg>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: davej@redhat.com
LKML-Reference: <20091228181118C.fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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