linux-kernel - [PATCH v2 5/8] iommu/tegra: gart: Clean up driver probe errors handling

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Message-Id: <20180804143003.15817-6-digetx@gmail.com>
Date:   Sat,  4 Aug 2018 17:30:00 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     iommu@...ts.linux-foundation.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/8] iommu/tegra: gart: Clean up driver probe errors handling

Properly clean up allocated resources on the drivers probe failure and
remove unneeded checks.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/iommu/tegra-gart.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index 9a427cb35340..def570bc88c4 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -429,9 +429,6 @@ static int tegra_gart_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	int ret;
 
-	if (gart_handle)
-		return -EIO;
-
 	BUILD_BUG_ON(PAGE_SHIFT != GART_PAGE_SHIFT);
 
 	/* the GART memory aperture is required */
@@ -466,8 +463,7 @@ static int tegra_gart_probe(struct platform_device *pdev)
 	ret = iommu_device_register(&gart->iommu);
 	if (ret) {
 		dev_err(dev, "Failed to register IOMMU\n");
-		iommu_device_sysfs_remove(&gart->iommu);
-		return ret;
+		goto remove_sysfs;
 	}
 
 	gart->dev = &pdev->dev;
@@ -483,7 +479,8 @@ static int tegra_gart_probe(struct platform_device *pdev)
 	gart->savedata = vmalloc(array_size(sizeof(u32), gart->page_count));
 	if (!gart->savedata) {
 		dev_err(dev, "failed to allocate context save area\n");
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto unregister_iommu;
 	}
 
 	platform_set_drvdata(pdev, gart);
@@ -493,6 +490,13 @@ static int tegra_gart_probe(struct platform_device *pdev)
 	tegra_mc_register_gart(&gart->mc_gart_handle);
 
 	return 0;
+
+unregister_iommu:
+	iommu_device_unregister(&gart->iommu);
+remove_sysfs:
+	iommu_device_sysfs_remove(&gart->iommu);
+
+	return ret;
 }
 
 static const struct dev_pm_ops tegra_gart_pm_ops = {
-- 
2.18.0