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Date: Fri, 30 Jan 2009 21:03:52 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Valdis.Kletnieks@vt.edu
Cc: linux-kernel@vger.kernel.org, Holger Macht <hmacht@suse.de>,
       linux-acpi@vger.kernel.org
Subject: Re: mmotm 2009-01-28-02-17 uploaded - docking station issues.
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On Thu, 29 Jan 2009 11:25:43 -0500 Valdis.Kletnieks@vt.edu wrote:

> On Wed, 28 Jan 2009 02:19:09 PST, akpm@linux-foundation.org said:
> > The mm-of-the-moment snapshot 2009-01-28-02-17 has been uploaded to
> > 
> >    http://userweb.kernel.org/~akpm/mmotm/
> 
> % ls -l /sys/devices/platform/dock.0/docked
> -r--r--r-- 1 root root 4096 2009-01-29 10:49 /sys/devices/platform/dock.0/docked
> % cat /sys/devices/platform/dock.0/docked
> ñÞcat: write error: Bad address
> 
> strace of the cat shows:
> 
> open("/sys/devices/platform/dock.0/docked", O_RDONLY) = 3
> fstat(3, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
> read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 1812586496
> 
> Under 2.6.29-rc2-mmotm0116, this would return either "0" or "1", not 4K
> of nulls.
> 

Is it due to 

acpi-dock-dont-eval-_sta-on-every-show_docked-sysfs-read.patch

and/or

acpi-dock-dont-eval-_sta-on-every-show_docked-sysfs-read-simplification.patch

?