linux-kernel - Re: [PATCH] phy: tegra: add missing put_device() call in tegra210_xusb_padctl

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Date:   Tue, 7 Dec 2021 17:35:02 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Qing Wang <wangqing@...o.com>, JC Kuo <jckuo@...dia.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-phy@...ts.infradead.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: tegra: add missing put_device() call in
 tegra210_xusb_padctl_probe()

07.12.2021 15:56, Qing Wang пишет:
> 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.
> 
> Signed-off-by: Wang Qing <wangqing@...o.com>
> ---
>  drivers/phy/tegra/xusb-tegra210.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/tegra/xusb-tegra210.c b/drivers/phy/tegra/xusb-tegra210.c
> index eedfc7c..05a0800
> --- a/drivers/phy/tegra/xusb-tegra210.c
> +++ b/drivers/phy/tegra/xusb-tegra210.c
> @@ -3170,8 +3170,10 @@ tegra210_xusb_padctl_probe(struct device *dev,
>  		goto out;
>  	}
>  
> -	if (!platform_get_drvdata(pdev))
> +	if (!platform_get_drvdata(pdev)) {
> +		put_device(&pdev->dev);
>  		return ERR_PTR(-EPROBE_DEFER);
> +	}
>  
>  	padctl->regmap = dev_get_regmap(&pdev->dev, "usb_sleepwalk");
>  	if (!padctl->regmap)
> 

What if dev_get_regmap() fails? What if driver is removed?

Please either fix it properly or don't fix it.