linux-kernel - [PATCH 2/2] iommu/vt-d: Check return value of acpi_bus_get

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Message-Id: <1408657045-4979-3-git-send-email-joro@8bytes.org>
Date:	Thu, 21 Aug 2014 23:37:25 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	linux-kernel@...r.kernel.org,
	Alex Williamson <alex.williamson@...hat.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 2/2] iommu/vt-d: Check return value of acpi_bus_get_device()

From: Joerg Roedel <jroedel@...e.de>

Checking adev == NULL is not sufficient as
acpi_bus_get_device() might not touch the value of this
parameter in an error case, so check the return value
directly.

Fixes: ed40356b5fcf1ce28e026ab39c5b2b6939068b50
Cc: David Woodhouse <dwmw2@...radead.org>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/dmar.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 60ab474..06d268a 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -678,8 +678,7 @@ static int __init dmar_acpi_dev_scope_init(void)
 				       andd->device_name);
 				continue;
 			}
-			acpi_bus_get_device(h, &adev);
-			if (!adev) {
+			if (acpi_bus_get_device(h, &adev)) {
 				pr_err("Failed to get device for ACPI object %s\n",
 				       andd->device_name);
 				continue;
-- 
1.9.1

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