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

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Message-ID: <SL2PR06MB3082D6C1C65786A1E8DD0397BD709@SL2PR06MB3082.apcprd06.prod.outlook.com>
Date:   Thu, 9 Dec 2021 09:58:52 +0000
From:   王擎 <wangqing@...o.com>
To:     Mark Brown <broonie@...nel.org>
CC:     Nicolin Chen <nicoleotsuka@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Shengjiu Wang <shengjiu.wang@...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()


>> 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.

Thanks,
Qing

>>                ret = -ENOMEM;
>>                 goto fail;