Re: [PATCH v2 02/15] ARM: bcm: fix a leaked reference by adding missing of_node_put

From: Ray Jui <ray.jui@broadcom.com>
To: Wen Yang <wen.yang99@zte.com.cn>, linux-kernel@vger.kernel.org
Cc: wang.yi59@zte.com.cn, Florian Fainelli <f.fainelli@gmail.com>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	bcm-kernel-feedback-list@broadcom.com,
	Russell King <linux@armlinux.org.uk>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 02/15] ARM: bcm: fix a leaked reference by adding missing of_node_put
Date: Tue, 5 Mar 2019 09:24:05 -0800	[thread overview]
Message-ID: <67d1be96-ad8a-a453-996f-731a363677ae@broadcom.com> (raw)
In-Reply-To: <1551785646-46173-2-git-send-email-wen.yang99@zte.com.cn>

On 3/5/2019 3:33 AM, Wen Yang wrote:
> The call to of_get_next_child returns a node pointer with refcount
> incremented thus it must be explicitly decremented after the last
> usage.
> 
> Detected by coccinelle with the following warnings:
> ./arch/arm/mach-bcm/board_bcm281xx.c:43:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 35, but without a corresponding object release within this function.
> 
> Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: Ray Jui <rjui@broadcom.com>
> Cc: Scott Branden <sbranden@broadcom.com>
> Cc: bcm-kernel-feedback-list@broadcom.com
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> ---
> v2->v1: add a missing space between "adding" and "missing"
> 
>  arch/arm/mach-bcm/board_bcm281xx.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/mach-bcm/board_bcm281xx.c b/arch/arm/mach-bcm/board_bcm281xx.c
> index b81bb38..1238ac8 100644
> --- a/arch/arm/mach-bcm/board_bcm281xx.c
> +++ b/arch/arm/mach-bcm/board_bcm281xx.c
> @@ -38,6 +38,7 @@ static void bcm281xx_restart(enum reboot_mode mode, const char *cmd)
>  		return;
>  	}
>  	base = of_iomap(np_wdog, 0);
> +	of_node_put(np_wdog);
>  	if (!base) {
>  		pr_emerg("Couldn't map brcm,kona-wdt\n");
>  		return;
> 

Change looks good to me. Thanks!

Acked-by: Ray Jui <ray.jui@broadcom.com>