linux-kernel - [PATCH V2] iommu/qcom: add missing put_device() call in qcom_iommu_of

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Date:   Tue, 29 Sep 2020 09:40:37 +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 V2] 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: 0ae349a0f33fb ("iommu/qcom: Add qcom_iommu")
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---

Changes in V2:
 - Fix wrong 'Fixes'
 - add missing '{}' after if

 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 9535a6af7553..b30d6c966e2c 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);
-- 
2.25.4