linux-kernel - Re: [Regression] [2.6.35-rc1] ssb_is_sprom

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Message-Id: <201006021620.13266.maciej.rutecki@gmail.com>
Date:	Wed, 2 Jun 2010 16:20:13 +0200
From:	Maciej Rutecki <maciej.rutecki@...il.com>
To:	"John W. Linville" <linville@...driver.com>
Cc:	Matthew Wilcox <matthew@....cx>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org, linux-usb@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>, netdev@...r.kernel.org,
	Michael Buesch <mb@...sch.de>
Subject: Re: [Regression] [2.6.35-rc1] ssb_is_sprom_available

On wtorek, 1 czerwca 2010 o 15:34:02 John W. Linville wrote:
> On Mon, May 31, 2010 at 02:53:00PM -0600, Matthew Wilcox wrote:
> > On Mon, May 31, 2010 at 09:55:20PM +0200, Maciej Rutecki wrote:
> > > Last known good: 2.6.34
> > > Failing kernel: 2.6.35-rc1
> > >
> > > subsystem: PCI, USB(?)
> > >
> > > Kernel dies during booting on message "ssb_is_sprom_available", see
> > > picture:
> > > http://www.unixy.pl/maciek/download/kernel/2.6.35-rc1/gumis/DSC_0011.JP
> > >G
> >
> > Um, looks like it's something to do with the Sonics Silicon Backplane,
> > not PCI, nor USB.
> 
> Fix is on its way...
> 
> commit da1fdb02d9200ff28b6f3a380d21930335fe5429
> Author: Christoph Fritz <chf.fritz@...glemail.com>
> Date:   Fri May 28 10:45:59 2010 +0200
> 
>     ssb: fix NULL ptr deref when pcihost_wrapper is used
> 
>     Ethernet driver b44 does register ssb by it's pcihost_wrapper
>     and doesn't set ssb_chipcommon. A check on this value
>     introduced with commit d53cdbb94a52a920d5420ed64d986c3523a56743
>     and ea2db495f92ad2cf3301623e60cb95b4062bc484 triggers:
> 
>     BUG: unable to handle kernel NULL pointer dereference at 00000010
>     IP: [<c1266c36>] ssb_is_sprom_available+0x16/0x30
> 
>     Signed-off-by: Christoph Fritz <chf.fritz@...glemail.com>
>     Signed-off-by: John W. Linville <linville@...driver.com>
> 

Yes this commit solves problem. Thanks

Tested-by: Maciej Rutecki <maciej.rutecki@...il.com>

-- 
Maciej Rutecki
http://www.maciek.unixy.pl
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