linux-kernel - [Resend][PATCH] Prevent oops at boot with VT-d

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Date:	Sun, 11 Jan 2009 07:25:31 -0800
From:	Dirk Hohndel <hohndel@...radead.org>
To:	David Woodhouse <dwmw2@...radead.org>,
	'Ingo Molnar' <mingo@...e.hu>
Cc:	"Zhao, Yu" <yu.zhao@...el.com>,
	"'linux-pci@...r.kernel.org'" <linux-pci@...r.kernel.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	'Jesse Barnes' <jbarnes@...tuousgeek.org>,
	"'iommu@...ts.linux-foundation.org'" 
	<iommu@...ts.linux-foundation.org>
Subject: [Resend][PATCH] Prevent oops at boot with VT-d

This wasn't included in 2.6.29-rc1

With some broken BIOSs when VT-d is enabled, the data structures are
filled incorrectly. This can cause a NULL pointer dereference in very
early boot. 


Signed-off-by: Dirk Hohndel <hohndel@...ux.intel.com>
Acked-by: Yu Zhao <yu.zhao@...el.com>
---
 drivers/pci/intel-iommu.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 235fb7a..3dfecb2 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -438,7 +438,8 @@ static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn)
                        continue;
 
                for (i = 0; i < drhd->devices_cnt; i++)
-                       if (drhd->devices[i]->bus->number == bus &&
+                       if (drhd->devices[i] &&
+                           drhd->devices[i]->bus->number == bus &&
                            drhd->devices[i]->devfn == devfn)
                                return drhd->iommu;
 
-- 
1.6.0.6
-- 
Dirk Hohndel
Intel Open Source Technology Center
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