linux-kernel - Re: [PATCH 01/15] ARM: actions: fix a leaked reference by addingmissing of_node

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Date:   Fri, 1 Mar 2019 21:25:23 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Wen Yang <wen.yang99@....com.cn>, linus.walleij@...aro.org,
        afaerber@...e.de
Cc:     liviu.dudau@....com, sudeep.holla@....com,
        lorenzo.pieralisi@....com, linux@...linux.org.uk,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kgene@...nel.org, krzk@...nel.org,
        linux-samsung-soc@...r.kernel.org, michal.simek@...inx.com,
        dinguyen@...nel.org, heiko@...ech.de,
        linux-rockchip@...ts.infradead.org, f.fainelli@...il.com,
        rjui@...adcom.com, sbranden@...adcom.com,
        bcm-kernel-feedback-list@...adcom.com, avifishman70@...il.com,
        tmaimon77@...il.com, venture@...gle.com, yuenn@...gle.com,
        brendanhiggins@...gle.com, openbmc@...ts.ozlabs.org,
        xuwei5@...ilicon.com, maxime.ripard@...tlin.com, wens@...e.org,
        catalin.marinas@....com, will.deacon@....com, horms@...ge.net.au,
        magnus.damm@...il.com, linux-renesas-soc@...r.kernel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        fabio.estevam@....com, linux-imx@....com, wang.yi59@....com.cn
Subject: Re: [PATCH 01/15] ARM: actions: fix a leaked reference by
 addingmissing of_node_put

Hi Wen,

On Fri, Mar 01, 2019 at 04:56:42PM +0800, 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-actions/platsmp.c:112:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 103, but without a corresponding object release within this function.
> ./arch/arm/mach-actions/platsmp.c:124:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 115, but without a corresponding object release within this function.
> ./arch/arm/mach-actions/platsmp.c:137:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 128, but without a corresponding object release within this function.
> 

We have a floating patch for this:
https://www.spinics.net/lists/arm-kernel/msg694544.html

Andreas: Can you please take a second look at the patchset submitted by Linus
Walleij and Russel for simplifying the Actions startup code?

Thanks,
Mani

> Signed-off-by: Wen Yang <wen.yang99@....com.cn>
> Cc: "Andreas Färber" <afaerber@...e.de>
> Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  arch/arm/mach-actions/platsmp.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm/mach-actions/platsmp.c b/arch/arm/mach-actions/platsmp.c
> index 4fd479c..1a8e078 100644
> --- a/arch/arm/mach-actions/platsmp.c
> +++ b/arch/arm/mach-actions/platsmp.c
> @@ -107,6 +107,7 @@ static void __init s500_smp_prepare_cpus(unsigned int max_cpus)
>  	}
>  
>  	timer_base_addr = of_iomap(node, 0);
> +	of_node_put(node);
>  	if (!timer_base_addr) {
>  		pr_err("%s: could not map timer registers\n", __func__);
>  		return;
> @@ -119,6 +120,7 @@ static void __init s500_smp_prepare_cpus(unsigned int max_cpus)
>  	}
>  
>  	sps_base_addr = of_iomap(node, 0);
> +	of_node_put(node);
>  	if (!sps_base_addr) {
>  		pr_err("%s: could not map sps registers\n", __func__);
>  		return;
> @@ -132,6 +134,7 @@ static void __init s500_smp_prepare_cpus(unsigned int max_cpus)
>  		}
>  
>  		scu_base_addr = of_iomap(node, 0);
> +		of_node_put(node);
>  		if (!scu_base_addr) {
>  			pr_err("%s: could not map scu registers\n", __func__);
>  			return;
> -- 
> 2.9.5
>