Re: [PATCH] soc: amlogic: meson-pwrc: Hold reference returned by of_get_parent()

[Neil Armstrong]

+ linux-amlogic, linux-arm-kernel, linux-kernel

On 05/07/2022 04:20, Liang He wrote:
> We should hold the reference returned by of_get_parent() and use
> it to call of_node_put() for refcount balance.
>
> Signed-off-by: Liang He <windhl@xxxxxxx>
> ---
>   drivers/soc/amlogic/meson-ee-pwrc.c     | 5 ++++-
>   drivers/soc/amlogic/meson-gx-pwrc-vpu.c | 5 ++++-
>   2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/soc/amlogic/meson-ee-pwrc.c b/drivers/soc/amlogic/meson-ee-pwrc.c
> index 2be3afe6c2e3..872ab8ba90bc 100644
> --- a/drivers/soc/amlogic/meson-ee-pwrc.c
> +++ b/drivers/soc/amlogic/meson-ee-pwrc.c
> @@ -470,6 +470,7 @@ static int meson_ee_pwrc_probe(struct platform_device *pdev)
>   	const struct meson_ee_pwrc_domain_data *match;
>   	struct regmap *regmap_ao, *regmap_hhi;
>   	struct meson_ee_pwrc *pwrc;
> +	struct device_node *np;
>   	int i, ret;
>   
>   	match = of_device_get_match_data(&pdev->dev);
> @@ -495,7 +496,9 @@ static int meson_ee_pwrc_probe(struct platform_device *pdev)
>   
>   	pwrc->xlate.num_domains = match->count;
>   
> -	regmap_hhi = syscon_node_to_regmap(of_get_parent(pdev->dev.of_node));
> +	np = of_get_parent(pdev->dev.of_node);
> +	regmap_hhi = syscon_node_to_regmap(np);
> +	of_node_put(np);
>   	if (IS_ERR(regmap_hhi)) {
>   		dev_err(&pdev->dev, "failed to get HHI regmap\n");
>   		return PTR_ERR(regmap_hhi);
> diff --git a/drivers/soc/amlogic/meson-gx-pwrc-vpu.c b/drivers/soc/amlogic/meson-gx-pwrc-vpu.c
> index b4615b288625..75a4e1cec416 100644
> --- a/drivers/soc/amlogic/meson-gx-pwrc-vpu.c
> +++ b/drivers/soc/amlogic/meson-gx-pwrc-vpu.c
> @@ -274,6 +274,7 @@ static int meson_gx_pwrc_vpu_probe(struct platform_device *pdev)
>   	struct regmap *regmap_ao, *regmap_hhi;
>   	struct meson_gx_pwrc_vpu *vpu_pd;
>   	struct reset_control *rstc;
> +	struct device_node *np;
>   	struct clk *vpu_clk;
>   	struct clk *vapb_clk;
>   	bool powered_off;
> @@ -291,7 +292,9 @@ static int meson_gx_pwrc_vpu_probe(struct platform_device *pdev)
>   
>   	memcpy(vpu_pd, vpu_pd_match, sizeof(*vpu_pd));
>   
> -	regmap_ao = syscon_node_to_regmap(of_get_parent(pdev->dev.of_node));
> +	np = of_get_parent(pdev->dev.of_node);
> +	regmap_ao = syscon_node_to_regmap(np);
> +	of_node_put(np);
>   	if (IS_ERR(regmap_ao)) {
>   		dev_err(&pdev->dev, "failed to get regmap\n");
>   		return PTR_ERR(regmap_ao);