From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthias Schwarzott <zzam@gentoo.org>
Date: Tue, 20 Oct 2009 08:05:10 +0000
Subject: Re: group is not set properly for usb printer for older kernels
Message-Id: <200910201005.10503.zzam@gentoo.org>
List-Id: <linux-hotplug.vger.kernel.org>
References: <20091008191201.19276c15@workstation64.home>
In-Reply-To: <20091008191201.19276c15@workstation64.home>
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To: linux-hotplug@vger.kernel.org

On Donnerstag, 15. Oktober 2009, Evangelos Foutras wrote:
> Kay Sievers wrote:
> > On Tue, Oct 13, 2009 at 05:30, Evangelos Foutras <foutrelis@gmail.com> 
wrote:
> >> I set udev's loglevel to "debug" and saw something interesting in my
> >> logs [1] after turning on the printer. Specifically, the following line
> >> appears to be of interest:
> >>
> >>  Oct 12 19:38:26 foutboxd udevd-work[7541]: '/lib/udev/usb_id' (stderr)
> >> 'error opening USB device 'descriptors' file'
> >>
> >> Maybe the 'descriptors' file hasn't been created when the udev rules
> >> fire? I think this would explain why subsequent calls to udevadm
> >> test/trigger apply the correct group to the printer.
> >
> > Yes, that might be. There have been numerous fixes to recent kernel
> > versions to address issues like this. You could try to set up rules
> > with WAIT_FOR_SYSFS="..." to possibly work around that on older kernel
> > versions.
>
> I tried your suggestion and placing WAIT_FOR_SYSFS="descriptors" before
> the IMPORT does produce the desired behavior (awesome!). If it's not
> clear, I'm referring to line 69 in 50-udev-default.rules [1].
>
> Any chance of applying this modification to udev.git? :)
>
So adding this rule anywhere before line 69 will help?
SUBSYSTEM="usb", ENV{DEVTYPE}="usb_device", WAIT_FOR_SYSFS="descriptors"

If yes, I am going to add it to the gentoo ruleset.

Regards
Matthias