linux-kernel - Re: [PATCH] memory: mtk-smi: add missing put_device() call in mtk_smi_device_link

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Message-ID: <c1050d0d-55ae-a626-58c5-b0fab6f8f0c3@canonical.com>
Date:   Thu, 30 Dec 2021 11:49:48 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Yong Wu <yong.wu@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Ikjoon Jang <ikjn@...omium.org>,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] memory: mtk-smi: add missing put_device() call in
 mtk_smi_device_link_common

On 30/12/2021 09:41, Miaoqian Lin wrote:
> The reference taken by 'of_find_device_by_node()' must be released when
> not needed anymore.
> Add the corresponding 'put_device()' in the error handling paths.
> 
> Fixes: 4740475 ("memory: mtk-smi: Add device link for smi-sub-common")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>  drivers/memory/mtk-smi.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index e201e5976f34..2131f2c9e7ed 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -386,8 +386,10 @@ static int mtk_smi_device_link_common(struct device *dev, struct device **com_de
>  	of_node_put(smi_com_node);
>  	if (smi_com_pdev) {
>  		/* smi common is the supplier, Make sure it is ready before */
> -		if (!platform_get_drvdata(smi_com_pdev))
> +		if (!platform_get_drvdata(smi_com_pdev)) {
> +			put_device(&smi_com_pdev->dev);
>  			return -EPROBE_DEFER;
> +		}

What about other return paths (-ENODEV, 0)?


Best regards,
Krzysztof