linux-kernel - [PATCH 4.19 160/287] iommu/exynos: Handle failed IOMMU device registration properly

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Date:   Tue, 23 Aug 2022 10:25:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sam Protsenko <semen.protsenko@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Joerg Roedel <jroedel@...e.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 160/287] iommu/exynos: Handle failed IOMMU device registration properly

From: Sam Protsenko <semen.protsenko@...aro.org>

[ Upstream commit fce398d2d02c0a9a2bedf7c7201b123e153e8963 ]

If iommu_device_register() fails in exynos_sysmmu_probe(), the previous
calls have to be cleaned up. In this case, the iommu_device_sysfs_add()
should be cleaned up, by calling its remove counterpart call.

Fixes: d2c302b6e8b1 ("iommu/exynos: Make use of iommu_device_register interface")
Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Acked-by: Marek Szyprowski <m.szyprowski@...sung.com>
Link: https://lore.kernel.org/r/20220714165550.8884-3-semen.protsenko@linaro.org
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iommu/exynos-iommu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 4bf6049dd2c7..8626c924f724 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -640,7 +640,7 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
 
 	ret = iommu_device_register(&data->iommu);
 	if (ret)
-		return ret;
+		goto err_iommu_register;
 
 	platform_set_drvdata(pdev, data);
 
@@ -667,6 +667,10 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
 	pm_runtime_enable(dev);
 
 	return 0;
+
+err_iommu_register:
+	iommu_device_sysfs_remove(&data->iommu);
+	return ret;
 }
 
 static int __maybe_unused exynos_sysmmu_suspend(struct device *dev)
-- 
2.35.1