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From:   Heiko =?ISO-8859-1?Q?St=FCbner?= <heiko@sntech.de>
To:     Wen Yang <wen.yang99@zte.com.cn>
Cc:     linux-kernel@vger.kernel.org, wang.yi59@zte.com.cn,
        Linus Walleij <linus.walleij@linaro.org>,
        linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org
Subject: Re: [PATCH 2/5] pinctrl: rockchip: fix leaked of_node references
Date:   Fri, 12 Apr 2019 10:08:25 +0200
Message-ID: <4822039.BKTqNpLmcE@diego>
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References: <1555048943-39589-1-git-send-email-wen.yang99@zte.com.cn> <1555048943-39589-3-git-send-email-wen.yang99@zte.com.cn>
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Hi,

Am Freitag, 12. April 2019, 08:02:20 CEST schrieb Wen Yang:
> The call to of_parse_phandle returns a node pointer with refcount
> incremented thus it must be explicitly decremented after the last
> usage.
> 
> Detected by coccinelle with the following warnings:
> ./drivers/pinctrl/pinctrl-rockchip.c:3221:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 3196, but without a corresponding object release within this function.
> ./drivers/pinctrl/pinctrl-rockchip.c:3223:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 3196, but without a corresponding object release within this function.
> 
> Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Heiko Stuebner <heiko@sntech.de>
> Cc: linux-gpio@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-rockchip@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> ---
>  drivers/pinctrl/pinctrl-rockchip.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
> index 16bf21b..e22d387 100644
> --- a/drivers/pinctrl/pinctrl-rockchip.c
> +++ b/drivers/pinctrl/pinctrl-rockchip.c
> @@ -3195,6 +3195,7 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank,
>  
>  		node = of_parse_phandle(bank->of_node->parent,
>  					"rockchip,pmu", 0);
> +		of_node_put(node);
>  		if (!node) {
>  			if (of_address_to_resource(bank->of_node, 1, &res)) {
>  				dev_err(info->dev, "cannot find IO resource for bank\n");
> 

hmm, the conditional does still use the node pointer, so the of_node_put
should probably be below the whole if clause?


Heiko