linux-kernel - Re: 2.6.18-rc6-mm2 (-mm1): ohci_hcd does not recognize new devices

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Message-ID: <Pine.LNX.4.44L0.0609181102450.7192-100000@iolanthe.rowland.org>
Date:	Mon, 18 Sep 2006 11:07:08 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Andrew Morton <akpm@...l.org>,
	David Brownell <david-b@...bell.net>,
	LKML <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>,
	Greg KH <greg@...ah.com>
Subject: Re: 2.6.18-rc6-mm2 (-mm1): ohci_hcd does not recognize new devices

On Mon, 18 Sep 2006, Rafael J. Wysocki wrote:

> > Actually, the problem is ohci_hcd doesn't seem to recognize devices plugged
> > into the USB ports.
> > 
> > For example, if I unplug and replug a mouse (that worked before unplugging),
> > it doesn't work any more.  I have to reload ohci_hcd to make it work again.
> > 
> > This is 100% reproducible and occurs on the two boxes above.
> 
> I have carried out a binary search and found that the problem is caused by
> 
> gregkh-usb-usbcore-remove-usb_suspend_root_hub.patch

Tell me, what happens if you leave that patch installed, and you use 
the patch I sent last week (the one that removes a chunk of code from 
ohci-hub.c), and you also set CONFIG_USB_SUSPEND?

I think the real underlying problem here is that David's implementation of 
root-hub suspend in ohci-hcd is incompatible with the overall scheme I've 
been working on.  In the end I'll probably have to rewrite the ohci-hcd 
code.

Alan Stern

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