linux-kernel - Re: [PATCH] USB: output an error message when the pipe type doesn't match the endpoint type

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Date:	Tue, 31 Aug 2010 09:52:26 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Clemens Ladisch <clemens@...isch.de>
cc:	Simon Arlott <simon@...e.lp0.eu>, Greg KH <greg@...ah.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] USB: output an error message when the pipe type doesn't
 match the endpoint type

On Tue, 31 Aug 2010, Clemens Ladisch wrote:

> Simon Arlott wrote:
> > Commit f661c6f8c67bd55e93348f160d590ff9edf08904 adds a check of the pipe type if
> > CONFIG_USB_DEBUG is enabled,
> 
> I didn't see that commit last year, but wouldn't it break devices like
> the ESI MIDI Mate whose descriptors want to have low-speed bulk transfers
> and where the driver has to submit interrupt transfers instead to get it
> to work at all?

When the kernel sees those invalid low-speed bulk endpoint descriptors,
it changes its internal copy of the descriptor to interrupt.  Hence
when the driver submits interrupt URBs, they work correctly.

Alan Stern

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