Re: [PATCH] USB: output an error message when the pipe type doesn'tmatch the endpoint type

[Alan Stern]

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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