6.6-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
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 --- drivers/iommu/tegra-smmu.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
--- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -804,10 +804,9 @@ static struct tegra_smmu *tegra_smmu_fin return NULL;
mc = platform_get_drvdata(pdev); - if (!mc) { - put_device(&pdev->dev); + put_device(&pdev->dev); + if (!mc) return NULL; - }
return mc->smmu; }