linux-kernel - Re: [PATCH v2 06/15] arm: npcm: fix a leaked reference by adding missing of_node

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Date:   Wed, 6 Mar 2019 14:02:01 +0200
From:   Avi Fishman <avifishman70@...il.com>
To:     Wen Yang <wen.yang99@....com.cn>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        wang.yi59@....com.cn, Tomer Maimon <tmaimon77@...il.com>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH v2 06/15] arm: npcm: fix a leaked reference by adding
 missing of_node_put

On Tue, Mar 5, 2019 at 1:33 PM Wen Yang <wen.yang99@....com.cn> 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-npcm/platsmp.c:52:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 31, but without a corresponding object release within this function.
> ./arch/arm/mach-npcm/platsmp.c:68:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 60, but without a corresponding object release within this function.
>
> Signed-off-by: Wen Yang <wen.yang99@....com.cn>
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> Cc: Avi Fishman <avifishman70@...il.com>
> Cc: Tomer Maimon <tmaimon77@...il.com>
> Cc: Patrick Venture <venture@...gle.com>
> Cc: Nancy Yuen <yuenn@...gle.com>
> Cc: Brendan Higgins <brendanhiggins@...gle.com>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: openbmc@...ts.ozlabs.org
> Cc: linux-kernel@...r.kernel.org
> ---
> v2->v1: add a missing space between "adding" and "missing"
>
>  arch/arm/mach-npcm/platsmp.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm/mach-npcm/platsmp.c b/arch/arm/mach-npcm/platsmp.c
> index 21633c7..fe63edc 100644
> --- a/arch/arm/mach-npcm/platsmp.c
> +++ b/arch/arm/mach-npcm/platsmp.c
> @@ -35,6 +35,7 @@ static int npcm7xx_smp_boot_secondary(unsigned int cpu,
>                 goto out;
>         }
>         gcr_base = of_iomap(gcr_np, 0);
> +       of_node_put(gcr_np);
>         if (!gcr_base) {
>                 pr_err("could not iomap gcr");
>                 ret = -ENOMEM;
> @@ -63,6 +64,7 @@ static void __init npcm7xx_smp_prepare_cpus(unsigned int max_cpus)
>                 return;
>         }
>         scu_base = of_iomap(scu_np, 0);
> +       of_node_put(scu_np);
>         if (!scu_base) {
>                 pr_err("could not iomap scu");
>                 return;
> --
> 2.9.5
>

Reviewed-by: Avi Fishman <avifishman70@...il.com>
-- 
Regards,
Avi