linux-kernel - Re: 3.6-rc7 boot crash + bisection

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Message-ID: <20120926144345.GC10549@amd.com>
Date:	Wed, 26 Sep 2012 16:43:45 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Florian Dazinger <florian@...inger.net>
CC:	Alex Williamson <alex.williamson@...hat.com>,
	<linux-kernel@...r.kernel.org>,
	iommu <iommu@...ts.linux-foundation.org>
Subject: Re: 3.6-rc7 boot crash + bisection

Florian,

On Wed, Sep 26, 2012 at 01:01:54AM +0200, Florian Dazinger wrote:
> you're right, either "amd_iommu=off" or removing the audio card makes
> the failure disappear. I will test the new BIOS rev. tomorrow.

Can you please test this diff and report if it fixes the problem for
you?

Thanks.

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b64502d..e89daf1 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -266,7 +266,7 @@ static void swap_pci_ref(struct pci_dev **from, struct pci_dev *to)
 
 static int iommu_init_device(struct device *dev)
 {
-	struct pci_dev *dma_pdev, *pdev = to_pci_dev(dev);
+	struct pci_dev *dma_pdev = NULL, *pdev = to_pci_dev(dev);
 	struct iommu_dev_data *dev_data;
 	struct iommu_group *group;
 	u16 alias;
@@ -293,7 +293,9 @@ static int iommu_init_device(struct device *dev)
 		dev_data->alias_data = alias_data;
 
 		dma_pdev = pci_get_bus_and_slot(alias >> 8, alias & 0xff);
-	} else
+	}
+
+	if (dma_pdev == NULL)
 		dma_pdev = pci_dev_get(pdev);
 
 	/* Account for quirked devices */

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