linux-kernel - Re: i2c_powermac: Kernel access of bad area

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Message-ID: <alpine.DEB.2.01.1001061107350.3483@bogon.housecafe.de>
Date:	Wed, 6 Jan 2010 11:14:25 -0800 (PST)
From:	Christian Kujau <lists@...dbynature.de>
To:	Jean Delvare <khali@...ux-fr.org>
cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: i2c_powermac: Kernel access of bad area

On Wed, 6 Jan 2010 at 17:37, Jean Delvare wrote:
> Christian, did you happen to try removing the i2c-powermac driver
> before?

Well, I definitely removed the driver before, but I'm not sure if I ever 
read the /sys files after doing this :-\

> I am curious if this is a recent problem, possibly caused by
> changes to the i2c stack, or if older kernels already had this problem
> and nobody ever noticed. I suspect the latter.

Fair question, but I really could't tell. I realize a bisection would be 
helpful, but I don't think I'll have to time to do this on this machine 
(it's a PowerBook G4, but kernel still compilation usually takes ~30min) 
and I'm not sure that I care _that_ much about this particular issue. 
I just wanted to report this one, for the sake of the archives, as noone 
else seems to be bothered by it anyway...

> I think that sysfs files creation should be moved to the end of
> probe_thermostat() and sysfs files removal should be moved to the
> beginning of remove_thermostat(). Something like the totally untested
> patch below (no ppc machine at hand):

OK, thanks Jean - I'll give it a try later today and let you know.


Thanks again,
Christian.

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