linux-kernel - Re: [ 080/262] usb: gadget: dummy

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Date:	Sat, 29 Sep 2012 21:01:15 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	Felipe Balbi <balbi@...com>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	alan@...rguk.ukuu.org.uk,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [ 080/262] usb: gadget: dummy_hcd: fixup error probe path

On Fri, 2012-09-28 at 11:50 -0700, Greg Kroah-Hartman wrote:
> From: Greg KH <gregkh@...uxfoundation.org>
> 
> 3.5-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
> 
> commit 1b68a4ca2d038addb7314211d122fb6d7002b38b upstream.
> 
> If USB2 host controller probes fine but USB3 does not then we don't
> remove the USB controller properly and lock up the system while the HUB
> code will try to enumerate the USB2 controller and access memory which
> is no longer available in case the dummy_hcd was compiled as a module.
> 
> This is a problem since 448b6eb1 ("USB: Make sure to fetch the BOS desc
> for roothubs.) if used in USB3 mode because dummy does not provide this
> descriptor and explodes later.
[...]

i.e. for 3.5 (as noted in the cc: stable line).  But I don't see why
this isn't needed for earlier kernel versions.  The same broken error
handling is present.

Ben.

-- 
Ben Hutchings
Usenet is essentially a HUGE group of people passing notes in class.
                      - Rachel Kadel, `A Quick Guide to Newsgroup Etiquette'

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