linux-kernel - Re: kernel panic in spi_complete() on spitz (PXA270)

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Message-ID: <1309445118.4406.47.camel@oct.suse.cz>
Date:	Thu, 30 Jun 2011 16:45:18 +0200
From:	Stanislav Brabec <utx@...guin.cz>
To:	Marek Vasut <marek.vasut@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	zaurus-devel@...ts.linuxtogo.org,
	spi-devel-general@...ts.sourceforge.net,
	Igor Grinberg <grinberg@...pulab.co.il>, vapier@...too.org,
	khilman@...prootsystems.com, dmitry.torokhov@...il.com,
	linux-kernel@...r.kernel.org, pavel@....cz,
	linux-input@...r.kernel.org, eric.y.miao@...il.com,
	akpm@...ux-foundation.org, broonie@...nsource.wolfsonmicro.com
Subject: Re: kernel panic in spi_complete() on spitz (PXA270)

Marek Vasut wrote:
> On Thursday, June 23, 2011 06:09:40 PM Stanislav Brabec wrote:
> > Hallo.
> > 
> > These Oops and kernel panic were observed on a Zaurus (spitz) machine
> > (ARMv5, PXA270).
> 
> Looks similar to "Re: [PATCH v2] Input: Make ADS7846 independent on regulator"

I don't see any trace in that thread. But yes, I was testing your patch
from this thread. Without it, ADS7846 does not work on spitz (ADS7846
does not have any dedicated regulator there). I want to
add .needs_regulator bool to ads7846.c and send the patch again to the
list.

After sending the trace I was able to reproduced it several times by
attaching of external charger.

Then I tried to apply "[PATCH] MAX1111: Fix race condition causing NULL
pointer exception", connected charger that periodically disconnects and
not seen the crash again. No OOPS was seen after ~100 reconnects.

So I guess that MAX1111 AC voltage reading (via SPI) was involved in an
incorrect moment and race happened there and your MAX1111 race condition
fix fixes it.

-- 
Stanislav Brabec
http://www.penguin.cz/~utx

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