linux-kernel - Re: usb device not showing up

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Message-ID: <Pine.LNX.4.44L0.0811051102010.2573-100000@iolanthe.rowland.org>
Date:	Wed, 5 Nov 2008 11:13:41 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Norbert Preining <preining@...ic.at>
cc:	Mattia Dongili <malattia@...ux.it>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: usb device not showing up

On Tue, 4 Nov 2008, Norbert Preining wrote:

> On Di, 04 Nov 2008, Alan Stern wrote:
> > > > If you can't boot with the modem off, then try this instead: Unload 
> > > > ehci-hcd, uhci-hcd, and ohci-hcd, then start up usbmon (copy the 0u 
> > > > file) and reload whichever driver the modem attaches to.
> 
> Ok, here it is. Booted with init=/bin/bash, no modules loaded, mounted
> /sys and debugfs, cat u0 > usbmon.txt. Then load uhci-hcd, then load hso
> modules.
> 
> Finally, kill the cat process.
> 
> Output is the attached usmon.txt file. 

Well, this is a little odd.  The trace shows the modem was detected and
enumerated correctly.  But there's nothing corresponding to when you
loaded the hso driver.  In fact, there's nothing after uhci-hcd 
finished starting up and the unconnected root hubs were suspended.

Did you look in /proc/bus/usb/devices at this point?  And what about
the files in /sys/bus/usb/drivers/hso/?

This suggests the problem may lie in the hso driver itself, or in a
failure to bind the driver to the device.

Alan Stern

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