linux-kernel - Re: pm_op(): usb_dev_suspend+0x0/0x10 returns -2 on USB device 8087:0020

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Message-ID: <20100225195249.GA5245@xanatos>
Date:	Thu, 25 Feb 2010 11:52:49 -0800
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Ákos Maróy <akos@...oy.hu>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>, USB list <linux-usb@...r.kernel.org>
Subject: Re: pm_op(): usb_dev_suspend+0x0/0x10 returns -2 on USB device
 8087:0020

On Thu, Feb 25, 2010 at 02:36:02PM -0500, Alan Stern wrote:
> On Thu, 25 Feb 2010, Sarah Sharp wrote:
> 
> > > > now, I unplug the USB DVD drive:
> > > > 
> > > > Feb 25 17:35:38 tonkachi kernel: [  276.374282] xhci_hcd 0000:02:00.0:
> > > > WARN: transfer error on endpoint
> > > > Feb 25 17:35:39 tonkachi kernel: [  276.728151] xhci_hcd 0000:02:00.0:
> > > > WARN: transfer error on endpoint
> > > > Feb 25 17:35:39 tonkachi kernel: [  276.728819] xhci_hcd 0000:02:00.0:
> > > > WARN: transfer error on endpoint
> 
> Shouldn't there be some messages here about "USB disconnect"?  This 
> suggests there's something wrong with the root hub.

True.  I can't tell exactly what's going on without
CONFIG_USB_XHCI_HCD_DEBUGGING.  It's possible the xHCI host never
notified the driver of the disconnect, or there's a bug in the xHCI hub
emulation code.

Sarah Sharp
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