linux-kernel - [PATCH 3/3] iommu/fsl: Fix the error condition during iommu group

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Date:	Tue, 24 Jun 2014 19:27:17 +0530
From:	Varun Sethi <Varun.Sethi@...escale.com>
To:	<iommu@...ts.linux-foundation.org>, <joro@...tes.org>,
	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<alex.williamson@...hat.com>
CC:	Varun Sethi <Varun.Sethi@...escale.com>
Subject: [PATCH 3/3] iommu/fsl: Fix the error condition during iommu group

Earlier PTR_ERR was being returned even if group was set to null.
Now, we explicitly set an ERR_PTR value in case the group  pointer is
NULL.

Signed-off-by: Varun Sethi <Varun.Sethi@...escale.com>
---
 drivers/iommu/fsl_pamu_domain.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 54060d1..af47648 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -1037,12 +1037,15 @@ root_bus:
 			group = get_shared_pci_device_group(pdev);
 	}
 
+	if (!group)
+		group = ERR_PTR(-ENODEV);
+
 	return group;
 }
 
 static int fsl_pamu_add_device(struct device *dev)
 {
-	struct iommu_group *group = NULL;
+	struct iommu_group *group = ERR_PTR(-ENODEV);
 	struct pci_dev *pdev;
 	const u32 *prop;
 	int ret, len;
@@ -1065,7 +1068,7 @@ static int fsl_pamu_add_device(struct device *dev)
 			group = get_device_iommu_group(dev);
 	}
 
-	if (!group || IS_ERR(group))
+	if (IS_ERR(group))
 		return PTR_ERR(group);
 
 	ret = iommu_group_add_device(group, dev);
-- 
1.7.9.5

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