From: Johan Hovold <johan@kernel.org>
Date: Mon, 20 Oct 2025 04:53:18 +0000 (+0200)
Subject: iommu/tegra: fix device leak on probe_device()
X-Git-Tag: v6.12.64~203
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9f620cf7496fa2d8b7dd97e3e64e75b616287d95;p=thirdparty%2Fkernel%2Fstable.git

iommu/tegra: fix device leak on probe_device()

commit c08934a61201db8f1d1c66fcc63fb2eb526b656d upstream.

Make sure to drop the reference taken to the iommu platform device when
looking up its driver data during probe_device().

Note that commit 9826e393e4a8 ("iommu/tegra-smmu: Fix missing
put_device() call in tegra_smmu_find") fixed the leak in an error path,
but the reference is still leaking on success.

Fixes: 891846516317 ("memory: Add NVIDIA Tegra memory controller support")
Cc: stable@vger.kernel.org	# 3.19: 9826e393e4a8
Cc: Miaoqian Lin <linmq006@gmail.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 7f633bb5efef1..23dad5134317f 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -823,10 +823,9 @@ static struct tegra_smmu *tegra_smmu_find(struct device_node *np)
 		return NULL;
 
 	mc = platform_get_drvdata(pdev);
-	if (!mc) {
-		put_device(&pdev->dev);
+	put_device(&pdev->dev);
+	if (!mc)
 		return NULL;
-	}
 
 	return mc->smmu;
 }