linux-kernel - [PATCH 3.19.y-ckt 011/196] iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS

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Message-Id: <1457483454-30115-12-git-send-email-kamal@canonical.com>
Date:	Tue,  8 Mar 2016 16:27:49 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	CQ Tang <cq.tang@...el.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 011/196] iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG

3.19.8-ckt16 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: CQ Tang <cq.tang@...el.com>

commit fda3bec12d0979aae3f02ee645913d66fbc8a26e upstream.

This is a 32-bit register. Apparently harmless on real hardware, but
causing justified warnings in simulation.

Signed-off-by: CQ Tang <cq.tang@...el.com>
Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/iommu/dmar.c                | 2 +-
 drivers/iommu/intel_irq_remapping.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 9847613..5a2ec39 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -1342,7 +1342,7 @@ void dmar_disable_qi(struct intel_iommu *iommu)
 
 	raw_spin_lock_irqsave(&iommu->register_lock, flags);
 
-	sts =  dmar_readq(iommu->reg + DMAR_GSTS_REG);
+	sts =  readl(iommu->reg + DMAR_GSTS_REG);
 	if (!(sts & DMA_GSTS_QIES))
 		goto end;
 
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index a55b207..153d3a7 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -543,7 +543,7 @@ static void iommu_disable_irq_remapping(struct intel_iommu *iommu)
 
 	raw_spin_lock_irqsave(&iommu->register_lock, flags);
 
-	sts = dmar_readq(iommu->reg + DMAR_GSTS_REG);
+	sts = readl(iommu->reg + DMAR_GSTS_REG);
 	if (!(sts & DMA_GSTS_IRES))
 		goto end;
 
-- 
2.7.0