...
> +struct tegra_mc *devm_tegra_get_memory_controller(struct device *dev)
> +{
> +     struct platform_device *pdev;
> +     struct device_node *np;
> +     struct tegra_mc *mc;
> +     int err;
> +
> +     np = of_find_matching_node_and_match(NULL, tegra_mc_of_match, NULL);
> +     if (!np)
> +             return ERR_PTR(-ENOENT);
> +
> +     pdev = of_find_device_by_node(np);
> +     of_node_put(np);
> +     if (!pdev)
> +             return ERR_PTR(-ENODEV);
> +
> +     mc = platform_get_drvdata(pdev);
> +     if (!mc) {
> +             put_device(mc->dev);

This should be put_device(&pdev->dev). Please always be careful while
copying someones else code :)
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