iommu/tegra-smmu: Fix missing put_device() call in tegra_smmu_find

BugLink: https://bugs.launchpad.net/bugs/1964361
commit 9826e393e4a8c3df474e7f9eacd3087266f74005 upstream.

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.

Fixes: 765a9d1d02b2 ("iommu/tegra-smmu: Fix mc errors on tegra124-nyan")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20220107080915.12686-1-linmq006@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 0a281833f6117b459add16afb10c25cd216fdb70..abbdaeb4bf8f19d92f1af5eb5b9b79cfd410c5f1 100644 (file)
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -808,8 +808,10 @@ static struct tegra_smmu *tegra_smmu_find(struct device_node *np)
                return NULL;
 
        mc = platform_get_drvdata(pdev);
-       if (!mc)
+       if (!mc) {
+               put_device(&pdev->dev);
                return NULL;
+       }
 
        return mc->smmu;
 }