linux-kernel - Re: [PATCH v3 net-next 03/13] net: hisilicon: cleanup to prepare for other cases

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Message-Id: <20160601.160706.1959937095056503271.davem@davemloft.net>
Date:	Wed, 01 Jun 2016 16:07:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Yisen.Zhuang@...wei.com
Cc:	rjw@...ysocki.net, lenb@...nel.org, fengguang.wu@...el.com,
	andriy.shevchenko@...ux.intel.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 v3 net-next 03/13] net: hisilicon: cleanup to prepare
 for other cases

From: Yisen Zhuang <Yisen.Zhuang@...wei.com>
Date: Mon, 30 May 2016 20:34:14 +0800

> -static void hns_mdio_bus_name(char *name, struct device_node *np)
> +static void hns_mdio_bus_name(char *name, phys_addr_t addr)
>  {
> -	const u32 *addr;
> -	u64 taddr = OF_BAD_ADDR;
> -
> -	addr = of_get_address(np, 0, NULL, NULL);
> -	if (addr)
> -		taddr = of_translate_address(np, addr);
> -
> -	snprintf(name, MII_BUS_ID_SIZE, "%s@...x", np->name,
> -		 (unsigned long long)taddr);
> +	snprintf(name, MII_BUS_ID_SIZE,
> +		 "hns-mdio@...x", (unsigned long long)addr);

This is a really bad idea.

You're passing in the resource address in here, which can be a bus
address.

And on a machine with multiple bus domains, the same address can be
used multiple times.  They are not unique at all in a multi-domain
system.