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

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Date:	Mon, 18 Sep 2006 22:51:08 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
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 Monday, 18 September 2006 17:07, Alan Stern wrote:
> 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?

The problem continues to happen.

Moreover, if I revert the above patch and apply the patch removing code
from ohci-hub.c, the problem reappears.

> 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.

Well, at this point I can only help you by testing some code. ;-)

Seriously, if you have any new patches to test, please let me know.

Greetings,
Rafael


-- 
You never change things by fighting the existing reality.
		R. Buckminster Fuller
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