linux-kernel - Re: [PATCH] net: hns: Fix object reference leaks in hns_dsaf_roce

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Date:   Fri, 15 Feb 2019 10:52:11 +0000
From:   John Garry <john.garry@...wei.com>
To:     Huang Zijiang <huang.zijiang@....com.cn>, <yisen.zhuang@...wei.com>
CC:     <salil.mehta@...wei.com>, <davem@...emloft.net>,
        <lipeng321@...wei.com>, <liuyonglong@...wei.com>,
        <yuehaibing@...wei.com>, <keescook@...omium.org>,
        <wangxi11@...wei.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <wang.yi59@....com.cn>,
        Linuxarm <linuxarm@...wei.com>
Subject: Re: [PATCH] net: hns: Fix object reference leaks in
 hns_dsaf_roce_reset()

On 14/02/2019 06:41, Huang Zijiang wrote:
> The of_find_device_by_node() takes a reference to the underlying device
> structure, we should release that reference.

of_find_device_by_node() is not called for every path, so is this change 
proper:

	/* find the platform device corresponding to fwnode */
	if (is_of_node(dsaf_fwnode)) {
		pdev = of_find_device_by_node(to_of_node(dsaf_fwnode));
	} else if (is_acpi_device_node(dsaf_fwnode)) {
		pdev = hns_dsaf_find_platform_device(dsaf_fwnode);
	} else {
		pr_err("fwnode is neither OF or ACPI type\n");
		return -EINVAL;
	}

	/* check if we were a success in fetching pdev */
	if (!pdev) {
		pr_err("couldn't find platform device for node\n");
		return -ENODEV;
	}

	/* retrieve the dsaf_device from the driver data */
	dsaf_dev = dev_get_drvdata(&pdev->dev);
	if (!dsaf_dev) {
		dev_err(&pdev->dev, "dsaf_dev is NULL\n");
		return -ENODEV;
	}

John

>
> Signed-off-by: Huang Zijiang <huang.zijiang@....com.cn>
> ---
>  drivers/net/ethernet/hisilicon/hns/hns_dsaf_main.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_main.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_main.c
> index 14d7ec7..697d929 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_main.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_main.c
> @@ -3081,6 +3081,7 @@ int hns_dsaf_roce_reset(struct fwnode_handle *dsaf_fwnode, bool dereset)
>  	dsaf_dev = dev_get_drvdata(&pdev->dev);
>  	if (!dsaf_dev) {
>  		dev_err(&pdev->dev, "dsaf_dev is NULL\n");
> +		put_device(&pdev->dev);
>  		return -ENODEV;
>  	}
>
> @@ -3088,6 +3089,7 @@ int hns_dsaf_roce_reset(struct fwnode_handle *dsaf_fwnode, bool dereset)
>  	if (AE_IS_VER1(dsaf_dev->dsaf_ver)) {
>  		dev_err(dsaf_dev->dev, "%s v1 chip doesn't support RoCE!\n",
>  			dsaf_dev->ae_dev.name);
> +		put_device(&pdev->dev);
>  		return -ENODEV;
>  	}
>
>