linux-kernel - Re: [PATCH 1/1] atmel-ssc: fix misuse of dev_dbg when requested ssc instance is not found

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Date:	Fri, 30 Jan 2009 10:50:57 +0100
From:	Hans-Christian Egtvedt <hans-christian.egtvedt@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>,
	linux-kernel@...r.kernel.org, dbrownell@...rs.sourceforge.net,
	kay.sievers@...y.org, weiyi.huang@...il.com,
	Andrew Victor <avictor.za@...il.com>
Subject: Re: [PATCH 1/1] atmel-ssc: fix misuse of dev_dbg when requested ssc
 instance is not found

On Fri, 30 Jan 2009 01:36:28 -0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Fri, 30 Jan 2009 10:26:54 +0100 Haavard Skinnemoen
> <haavard.skinnemoen@...el.com> wrote:
> 
> > [CCs added]
> > 
> > Hans-Christian Egtvedt wrote:
> > > This patch replaces the dev_dbg(...) with a pr_err since the ssc
> > > pointer is not valid when the id is not found in the list.
> > > 
> > > Signed-off-by: Hans-Christian Egtvedt
> > > <hans-christian.egtvedt@...el.com>
> > 
> > Acked-by: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
> > 
> > ...or should I just apply it to the avr32 tree?
> > 
> 
> Is OK, I tossed into onto my 2.6.29 pile.
> 
> Should it be backported to 2.6.28.x or earlier?
> 

It shoud apply clean to 2.6.28.x as well, but this bug will only
trigger when a user of the SSC peripheral tries to request a SSC which
is already requested or not added to the list at all. So in most cases
bad platform drivers setup, configuration error or bad code.

In kernel 2.6.29-rc3 there are three users:

1 sound/soc/atmel/sam9g20_wm8731.c        274 ssc = ssc_request(0);
2 sound/soc/atmel/playpaq_wm8510.c        399 ssc = ssc_request(0);
3 sound/spi/at73c213.c                    980 chip->ssc = ssc_request(board->ssc_id);

The two first are a bit suspicious since they hard code id 0.

My 0.02 € is to get it in for 2.6.29, but fine to leave out for earlier
kernels.

-- 
Best regards,
Hans-Christian Egtvedt
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