[PATCH 5.9 347/757] iommu/qcom: add missing put_device() call in qcom_iommu_of_xlate()

Greg Kroah-Hartman
2020-10-27T15:47:39Z

From: Yu Kuai <yukuai3@huawei.com>

[ Upstream commit e2eae09939a89e0994f7965ba3c676a5eac8b4b0 ]

if of_find_device_by_node() succeed, qcom_iommu_of_xlate() doesn't have
a corresponding put_device(). Thus add put_device() to fix the exception
handling for this function implementation.

Fixes: 0ae349a0f33f ("iommu/qcom: Add qcom_iommu")
Acked-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20200929014037.2436663-1-yukuai3@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iommu/arm/arm-smmu/qcom_iommu.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
index af6bec3ace007..ef3dd32aa6d97 100644
--- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c
+++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
@@ -584,8 +584,10 @@ static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
* index into qcom_iommu->ctxs:
*/
if (WARN_ON(asid < 1) ||
- WARN_ON(asid > qcom_iommu->num_ctxs))
+ WARN_ON(asid > qcom_iommu->num_ctxs)) {
+ put_device(&iommu_pdev->dev);
return -EINVAL;
+ }

if (!dev_iommu_priv_get(dev)) {
dev_iommu_priv_set(dev, qcom_iommu);
@@ -594,8 +596,10 @@ static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
* multiple different iommu devices. Multiple context
* banks are ok, but multiple devices are not:
*/
- if (WARN_ON(qcom_iommu != dev_iommu_priv_get(dev)))
+ if (WARN_ON(qcom_iommu != dev_iommu_priv_get(dev))) {
+ put_device(&iommu_pdev->dev);
return -EINVAL;
+ }
}

return iommu_fwspec_add_ids(dev, &asid, 1);
--
2.25.1