linux-kernel - RE: Intel IOMMU on Dell Latitude E6400, Lenovo X200 & Dell Precision T5400

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Message-ID: <A6AD88C3F2289247BE726C37303E1EB8927A8E8E@orsmsx505.amr.corp.intel.com>
Date:	Thu, 29 Jan 2009 17:25:56 -0800
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	'Oleg Orel' <oorel@...are.com>, "Raj, Ashok" <ashok.raj@...el.com>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	"'avi@...ranet.com'" <avi@...ranet.com>,
	"'yaniv@...ranet.com'" <yaniv@...ranet.com>,
	'Bhavesh Davda' <bhavesh@...are.com>,
	'Mallik Mahalingam' <mallik@...are.com>,
	'Jagannath Krishnan' <krishnan@...are.com>,
	'Adar Dembo' <adar@...are.com>,
	"'iommu@...ts.linux-foundation.org'" 
	<iommu@...ts.linux-foundation.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: RE: Intel IOMMU on Dell Latitude E6400, Lenovo X200 & Dell
 Precision T5400

>We had reported more details @
>https://bugzilla.redhat.com/show_bug.cgi?id=479996 and
>http://bugzilla.kernel.org/show_bug.cgi?id=11821

Look into http://bugzilla.kernel.org/show_bug.cgi?id=11821
and find that:

wlan0: Failed to config new SSID to the low-level driver
BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
IP: [<ffffffff8037cf1f>] pci_find_upstream_pcie_bridge+0x1f/0xa0
...
[<ffffffff80386808>] get_domain_for_dev+0x58/0x620
 [<ffffffff8029574d>] ? __alloc_pages_internal+0xed/0x4f0
 [<ffffffff803870f8>] get_valid_domain_for_dev+0x18/0x150
 [<ffffffff803875e7>] intel_map_single+0x47/0x160
 [<ffffffff802b8726>] ? alloc_pages_current+0x76/0xf0
 [<ffffffff8038777f>] intel_alloc_coherent+0x7f/0xb0
...

Wireless LAN could cause the NULL pointer access in get_domain_for_dev() which is IOMMU function.

As an experiment, could you disable wireless lan on your machine and try to boot IOMMU kernel?

Thanks.

-Fenghua
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