linux-kernel - [PATCH 3.12 128/142] iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS

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Date:	Wed, 24 Feb 2016 11:05:23 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, CQ Tang <cq.tang@...el.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 128/142] iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG

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

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

===============

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: Jiri Slaby <jslaby@...e.cz>
---
 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 785675a56a10..ba5d1a37a90d 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -972,7 +972,7 @@ 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 b97d70b1abe0..0ff40be0f3b2 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -495,7 +495,7 @@ 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;
 
-- 
2.7.1