linux-kernel - Re: [V4.0.0-rc3] Xhci Regression: ERROR Transfer event TRB DMA ptr not part of current TD

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Date:	Tue, 10 Mar 2015 13:29:55 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Mathias Nyman <mathias.nyman@...ux.intel.com>
cc:	Jörg Otte <jrg.otte@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	USB list <linux-usb@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>
Subject: Re: [V4.0.0-rc3] Xhci Regression: ERROR Transfer event TRB DMA ptr
 not part of current TD

On Tue, 10 Mar 2015, Mathias Nyman wrote:

> Yes, thank you
> 
> Seems that It wasn't mature enough, I'll revert it.
> 
> From your logs I can see what went wrong, 
> 
> If you still have some time, could you try out a patch (attached) and see if it solves the
> issue for you. (on top of clean 4.0-rc3). I can't reproduce it with my own USB DVB-T device

Mathias:

Your patch description says this:

> The endpoint might already processesed some TRBs on the endpiont ring
> before we soft reset the endpoint.
> Make sure we set the dequeue pointer to where we were befere soft reset

However, if a driver tries to issue an endpoint reset while there are
still some URBs queued, it is a bug.  Host controller drivers shouldn't
have to worry about this -- xhci_endpoint_reset() should simply return 
an error if the endpoint ring isn't empty.

I suppose we should check for this in the USB core.  I'll write a patch
and CC: you.

Alan Stern

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