linux-kernel - Re: [PATCH] sound: fsl: add missing put_device() call in imx_hdmi

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Message-ID: <CAA+D8APDEhri4RKfjwSe-pM_xGKV+Oc6JVJUPFBqU8T+VH5K8A@mail.gmail.com>
Date:   Mon, 20 Dec 2021 19:33:45 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     王擎 <wangqing@...o.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.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] sound: fsl: add missing put_device() call in imx_hdmi_probe()

On Thu, Dec 9, 2021 at 5:58 PM 王擎 <wangqing@...o.com> wrote:
>
>
> >> From: Wang Qing <wangqing@...o.com>
> >>
> >> of_find_device_by_node() takes a reference to the embedded struct device
> >> which needs to be dropped when error return.
> >
> >...
> >
> >>        data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> >>        if (!data) {
> >> +             put_device(&cpu_pdev->dev);
> >
> >If it's of_find_device_by_node() you need an of_node_put() since you're
> >dropping a reference on the OF node.
> >
>
> Label fail will drop a reference on the OF node.
> Also, put_device() is called later except this branch,
> we just need to add put_device() here.
>
I agree with you. But could you please add the info in this
commit that
the commit:
f670b274f7f6 ASoC: imx-hdmi: add put_device() after of_find_device_by_node()
is partially fixing the original issue, so we still need this fix.

Best regards
Wang Shengjiu