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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Yu Kuai <yukuai3@huawei.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Joerg Roedel <jroedel@suse.de>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 27/38] iommu/exynos: add missing put_device() call in exynos_iommu_of_xlate()
Date:   Mon,  5 Oct 2020 17:26:44 +0200
Message-Id: <20201005142109.977461657@linuxfoundation.org>
In-Reply-To: <20201005142108.650363140@linuxfoundation.org>
References: <20201005142108.650363140@linuxfoundation.org>
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From: Yu Kuai <yukuai3@huawei.com>

[ Upstream commit 1a26044954a6d1f4d375d5e62392446af663be7a ]

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

Fixes: aa759fd376fb ("iommu/exynos: Add callback for initializing devices from device tree")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20200918011335.909141-1-yukuai3@huawei.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/exynos-iommu.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 1bd0cd7168dfc..4bf6049dd2c79 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1302,13 +1302,17 @@ static int exynos_iommu_of_xlate(struct device *dev,
 		return -ENODEV;
 
 	data = platform_get_drvdata(sysmmu);
-	if (!data)
+	if (!data) {
+		put_device(&sysmmu->dev);
 		return -ENODEV;
+	}
 
 	if (!owner) {
 		owner = kzalloc(sizeof(*owner), GFP_KERNEL);
-		if (!owner)
+		if (!owner) {
+			put_device(&sysmmu->dev);
 			return -ENOMEM;
+		}
 
 		INIT_LIST_HEAD(&owner->controllers);
 		mutex_init(&owner->rpm_lock);
-- 
2.25.1