linux-kernel - Re: [patch v2 net-next 12/13] net: hns: implement the miscellaneous operation by asl

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Date:	Mon, 30 May 2016 11:25:56 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Kejian Yan <yankejian@...wei.com>, rjw@...ysocki.net,
	lenb@...nel.org, davem@...emloft.net
Cc:	fengguang.wu@...el.com, andrew@...n.ch, ivecera@...hat.com,
	f.fainelli@...il.com, haifeng.wei@...wei.com,
	charles.chenxin@...wei.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linuxarm@...wei.com
Subject: Re: [patch v2 net-next 12/13] net: hns: implement the miscellaneous
 operation by asl

On Mon, 2016-05-30 at 10:10 +0800, Kejian Yan wrote:
> The miscellaneous operation is implemented in BIOS, the kernel can
> call
> _DSM method help to call the implementation in ACPI case. Here is a
> patch
> to do that.
> 


> +static phy_interface_t hns_mac_get_phy_if_acpi(struct hns_mac_cb
> *mac_cb)
> +{
> +	phy_interface_t phy_if = PHY_INTERFACE_MODE_NA;
> +	union acpi_object *obj;
> +	union acpi_object obj_args, argv4;
> +
> +	obj_args.integer.type = ACPI_TYPE_INTEGER;
> +	obj_args.integer.value = mac_cb->mac_id;
> +
> +	argv4.type = ACPI_TYPE_PACKAGE,
> +	argv4.package.count = 1,
> +	argv4.package.elements = &obj_args,
> +
> +	obj = acpi_evaluate_dsm(ACPI_HANDLE(mac_cb->dev),
> +				hns_dsaf_acpi_dsm_uuid, 0,
> +				HNS_OP_GET_PORT_TYPE_FUNC, &argv4);
> +
> +	if (!obj || obj->type != ACPI_TYPE_INTEGER)

Seems you have potential memory leak here

if (!obj)
 return phy_if;

if (obj->...)
 goto exit_free;


> +		return phy_if;
> +
> +	phy_if = obj->integer.value ?
> +		PHY_INTERFACE_MODE_XGMII : PHY_INTERFACE_MODE_SGMII;
> +
> +	dev_dbg(mac_cb->dev, "mac_id=%d, phy_if=%d\n", mac_cb-
> >mac_id, phy_if);
> +

+ exit_free:

> +	ACPI_FREE(obj);
> +
> +	return phy_if;
> +}
> 

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy