linux-kernel - [PATCH v2] iommu/omap: Fix missing put_device() call in omap_iommu_probe

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Message-Id: <20220301063326.18120-1-linmq006@gmail.com>
Date:   Tue,  1 Mar 2022 06:33:25 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Suman Anna <s-anna@...com>, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH v2] iommu/omap: Fix missing put_device() call in omap_iommu_probe_device

The reference taken by 'of_find_device_by_node()' must be released when
not needed anymore.
Add the corresponding 'put_device()' in the error handling path and
the regular path.

Fixes: ede1c2e7d4dc ("iommu/omap: Store iommu_dev pointer in arch_data")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
changes in v2:
- move put_device() before of_node_put().
- add put_device() in the regular path.
---
 drivers/iommu/omap-iommu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 91749654fd49..2222b30a0a00 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1683,6 +1683,7 @@ static struct iommu_device *omap_iommu_probe_device(struct device *dev)
 
 		oiommu = platform_get_drvdata(pdev);
 		if (!oiommu) {
+			put_device(&pdev->dev);
 			of_node_put(np);
 			kfree(arch_data);
 			return ERR_PTR(-EINVAL);
@@ -1691,6 +1692,7 @@ static struct iommu_device *omap_iommu_probe_device(struct device *dev)
 		tmp->iommu_dev = oiommu;
 		tmp->dev = &pdev->dev;
 
+		put_device(&pdev->dev);
 		of_node_put(np);
 	}
 
-- 
2.17.1