linux-kernel - Re: Status of Bug 8094 - ipaq oops on connecting "Vodafone VPA-II" ?

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Date:	Sun, 20 Sep 2009 21:59:17 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Tilman Schmidt <tilman@...p.cc>
cc:	Matthias Geissert <matthias.geissert@....de>,
	Greg KH <greg@...ah.com>, USB list <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Status of Bug 8094 -  ipaq oops on connecting "Vodafone VPA-II"
 ?

On Sun, 20 Sep 2009, Greg KH wrote:

> Yes, I missed the fact that the ipaq driver needed to pay attention to
> this, my mistake :(
> 
> I'm pretty much not able to write any new patches until the end of next
> week, due to conferences I'm currently attending, so if someone wants to
> knock up a patch to fix this before then, it would be most appreciated.

Here's a patch which ought to fix the oops.  I trust it won't cause 
any existing devices to start misbehaving.  Tilman and Matthias, please 
verify that this works okay on your systems.

A better approach might be to test the bInterfaceClass value, but I 
don't know if that would work; there might be some devices using a 
strange value.

Alan Stern



Index: usb-2.6/drivers/usb/serial/ipaq.c
===================================================================
--- usb-2.6.orig/drivers/usb/serial/ipaq.c
+++ usb-2.6/drivers/usb/serial/ipaq.c
@@ -966,6 +966,15 @@ static int ipaq_calc_num_ports(struct us
 static int ipaq_startup(struct usb_serial *serial)
 {
 	dbg("%s", __func__);
+
+	/* Some of the devices in ipaq_id_table[] are composite, and we
+	 * shouldn't bind to all the interfaces.  This test will rule out
+	 * some obviously invalid possibilities.
+	 */
+	if (serial->num_bulk_in < serial->num_ports ||
+			serial->num_bulk_out < serial->num_ports)
+		return -ENODEV;
+
 	if (serial->dev->actconfig->desc.bConfigurationValue != 1) {
 		/*
 		 * FIXME: HP iPaq rx3715, possibly others, have 1 config that

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