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Subject[PATCH AUTOSEL 4.4 11/12] iommu/vt-d: quirk_ioat_snb_local_iommu: replace WARN_TAINT with pr_warn + add_taint
From: Hans de Goede <>

[ Upstream commit 81ee85d0462410de8eeeec1b9761941fd6ed8c7b ]

Quoting from the comment describing the WARN functions in

* WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
* significant kernel issues that need prompt attention if they should ever
* appear at runtime.
* Do not use these macros when checking for invalid external inputs

The (buggy) firmware tables which the dmar code was calling WARN_TAINT
for really are invalid external inputs. They are not under the kernel's
control and the issues in them cannot be fixed by a kernel update.
So logging a backtrace, which invites bug reports to be filed about this,
is not helpful.

Fixes: 556ab45f9a77 ("ioat2: catch and recover from broken vtd configurations v6")
Signed-off-by: Hans de Goede <>
Acked-by: Lu Baolu <>
Signed-off-by: Joerg Roedel <>
Signed-off-by: Sasha Levin <>
drivers/iommu/intel-iommu.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index a2005b82ec8ff..3a97225d0b182 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3949,10 +3949,11 @@ static void quirk_ioat_snb_local_iommu(struct pci_dev *pdev)

/* we know that the this iommu should be at offset 0xa000 from vtbar */
drhd = dmar_find_matched_drhd_unit(pdev);
- if (WARN_TAINT_ONCE(!drhd || drhd->reg_base_addr - vtbar != 0xa000,
- "BIOS assigned incorrect VT-d unit for Intel(R) QuickData Technology device\n"))
+ if (!drhd || drhd->reg_base_addr - vtbar != 0xa000) {
+ pr_warn_once(FW_BUG "BIOS assigned incorrect VT-d unit for Intel(R) QuickData Technology device\n");
pdev->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;
+ }

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