[PATCH v5 02/21] iommu/tegra: gart: Clean up driver probe errors handling

Dmitry Osipenko
2018-09-30T22:49:03Z

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

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.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 6dda7ee1d36c..e9524ed264cf 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -408,9 +408,6 @@ 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 */
@@ -445,8 +442,7 @@ 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;
@@ -460,7 +456,8 @@ 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);
@@ -469,6 +466,13 @@ static int tegra_gart_probe(struct platform_device *pdev)
gart_handle = gart;

return 0;
+
+unregister_iommu:
+ iommu_device_unregister(&gart->iommu);
+remove_sysfs:
+ iommu_device_sysfs_remove(&gart->iommu);
+
+ return ret;
}

static int tegra_gart_remove(struct platform_device *pdev)
--
2.19.0