linux-kernel - Re: [BUG, Regression, bisected] USB mouse causes bug on 1st insert, ignored on 2nd insert, lsusb stuck at usbdev

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Date:	Mon, 20 Sep 2010 16:55:31 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Jiri Kosina <jkosina@...e.cz>
cc:	Mat <jackdachef@...il.com>,
	Guillaume Chazarain <guichaz@...il.com>,
	<linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Oliver Neukum <oliver@...kum.org>, Alan Ott <alan@...nal11.us>,
	<linux-usb@...r.kernel.org>, <linux-input@...r.kernel.org>,
	Andreas Bombe <aeb@...ian.org>,
	Alex Riesen <raa.lkml@...il.com>,
	Phil Turmel <philip@...mel.org>
Subject: Re: [BUG, Regression, bisected] USB mouse causes bug on 1st insert,
 ignored on 2nd insert, lsusb stuck at usbdev_open

On Mon, 20 Sep 2010, Jiri Kosina wrote:

> Thanks Matt and Phill for confirming the line that triggers the oops. As I 
> am not able to reproduce it myself, it's a bit tricky to track down what 
> went wrong.
> 
> Could you please apply the patch below? It's printing the hid <-> hiddev 
> <-> usb_interface connections at various stages of probing and open. 
> Hopefully it'll reveal a little bit what goes wrong and where.

Jiri:

There's something very fishy going on here.  Even more so than these 
bug reports suggest.

The whole business about hiddev_driver in hiddev.c looks bogus.  It
doesn't get used for anything and it never binds to an interface.  
Which means that the usb_find_interface call in hiddev_open should
never succeed.  At the very least it would need to specify hid_driver
instead of hiddev_driver.

I have no idea what's really happening.  Can you figure it out?

Alan Stern

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