linux-kernel - [PATCH] iommu/qcom: add missing put_device() call in qcom_iommu_of

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Message-ID: <20200918011357.909335-1-yukuai3@huawei.com>
Date:   Fri, 18 Sep 2020 09:13:57 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <robdclark@...il.com>, <will@...nel.org>, <joro@...tes.org>
CC:     <iommu@...ts.linux-foundation.org>,
        <linux-arm-msm@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <yukuai3@...wei.com>,
        <yi.zhang@...wei.com>
Subject: [PATCH] iommu/qcom: add missing put_device() call in qcom_iommu_of_xlate()

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: e86d1aa8b60f ("iommu/arm-smmu: Move Arm SMMU drivers into their own subdirectory")
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/iommu/arm/arm-smmu/qcom_iommu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
index 9535a6af7553..7a9594d221e0 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);
@@ -595,6 +597,7 @@ static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
 		 * banks are ok, but multiple devices are not:
 		 */
 		if (WARN_ON(qcom_iommu != dev_iommu_priv_get(dev)))
+			put_device(&iommu_pdev->dev);
 			return -EINVAL;
 	}
 
-- 
2.25.4