linux-kernel - Re: [PATCH] phy: amlogic: phy-meson-axg-mipi-pcie-analog: Hold reference returned by of_get

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Message-ID: <e2746084-ee88-7dc6-afd5-0d0dca4723c4@baylibre.com>
Date:   Tue, 5 Jul 2022 09:21:49 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Liang He <windhl@....com>, kishon@...com, khilman@...libre.com,
        jbrunet@...libre.com, martin.blumenstingl@...glemail.com,
        linux-phy@...ts.infradead.org
Cc:     "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: amlogic: phy-meson-axg-mipi-pcie-analog: Hold
 reference returned by of_get_parent()

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

On 05/07/2022 04:15, Liang He wrote:
> We should hold the reference returned by of_get_parent() and use it
> to call of_node_put() for reference balance.
> 
> Fixes: 8eff8b4e22d9 ("phy: amlogic: phy-meson-axg-mipi-pcie-analog: add support for MIPI DSI analog")
> Signed-off-by: Liang He <windhl@....com>
> ---
>   drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c b/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c
> index 1027ece6ca12..a3e1108b736d 100644
> --- a/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c
> +++ b/drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c
> @@ -197,7 +197,7 @@ static int phy_axg_mipi_pcie_analog_probe(struct platform_device *pdev)
>   	struct phy_provider *phy;
>   	struct device *dev = &pdev->dev;
>   	struct phy_axg_mipi_pcie_analog_priv *priv;
> -	struct device_node *np = dev->of_node;
> +	struct device_node *np = dev->of_node, *parent_np;
>   	struct regmap *map;
>   	int ret;
>   
> @@ -206,7 +206,9 @@ static int phy_axg_mipi_pcie_analog_probe(struct platform_device *pdev)
>   		return -ENOMEM;
>   
>   	/* Get the hhi system controller node */
> -	map = syscon_node_to_regmap(of_get_parent(dev->of_node));
> +	parent_np = of_get_parent(dev->of_node);
> +	map = syscon_node_to_regmap(parent_np);
> +	of_node_put(parent_np);
>   	if (IS_ERR(map)) {
>   		dev_err(dev,
>   			"failed to get HHI regmap\n");