linux-kernel - Re: [PATCH 1/1] net: phylib: remove the length limitation of mii bus id

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Message-ID: <20120321112655.GB4905@shlinux2.ap.freescale.net>
Date:	Wed, 21 Mar 2012 19:26:56 +0800
From:	Dong Aisheng <aisheng.dong@...escale.com>
To:	Florian Fainelli <florian@...nwrt.org>
CC:	Dong Aisheng <dongas86@...il.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Dong Aisheng-B29396 <B29396@...escale.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/1] net: phylib: remove the length limitation of mii
 bus id

On Tue, Mar 20, 2012 at 10:06:57PM +0800, Florian Fainelli wrote:
> Hi,
> 
> Le 03/20/12 11:53, Dong Aisheng a écrit :
> > On Tue, Mar 20, 2012 at 1:32 AM, Shawn Guo<shawn.guo@...aro.org>  wrote:
> >> On 20 March 2012 12:23, Dong Aisheng<b29396@...escale.com>  wrote:
> >>> From: Dong Aisheng<dong.aisheng@...aro.org>
> >>>
> >>> When convert to dt, the length of old mii bus id (17 bytes) is not
> >>> sufficent to use.
> >>> For example, the bus id could be 800f0000.ethernet-1:00 in DT.
> >>>
> >>> This patch removes the bus id length limitation by changing the
> >>> bus id to a const char pionter and user could dynamically set the
> >>> bus id via kasprintf function call.
> >>>
> >>> Since then no users use MII_BUS_ID_SIZE any more, just remove it.
> >>>
> >>> Signed-off-by: Dong Aisheng<dong.aisheng@...aro.org>
> >>> ---
> >>> The simplest way may just change MII_BUS_ID_SIZE to a more bigger size,
> >>> but i'm not sure that's gonna be accepted.
> >>
> >> The simplest fix has been applied on -next tree as below.
> >>
> > Oh, i missed it, seems my patch covers that change.
> > But that patch only fixed wrong phy_name buffer length issue.
> > My patch is totally remove the length limitation of bus id and phy_name
> > or the bus id name will be truncated if it's longer than MII_BUS_ID_SIZE
> > which is not a comfortable limitation.
> 
> Then just increase the bus id size locally for your driver. Drivers that 
> can live with a static allocation are better of using it.
> 
That's the common part, can not change it locally by driver.
Or we can change MII_BUS_ID_SIZE to a more big size in common code,
maybe 30 bytes, but when is the end?

> Your patch completely missed testing the return value of kasprintf(), 
> and its return value can be NULL, please fix this at least.
> 
Yes, thanks for the reminder.
I will fix it.

Regards
Dong Aisheng

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