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Date: Sat, 07 Jul 2007 23:11:36 -0600 (MDT)
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To: xiaofanc@gmail.com
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-usb@freebsd.org
Subject: Re: libusb usb_interrupt_read hangs under FreeBSD
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In message: <a276da400707071725x2b2b8ab3ife6c5459d06042bd@mail.gmail.com>
            "Xiaofan Chen" <xiaofanc@gmail.com> writes:
: On 7/5/07, Hans Petter Selasky <hselasky@c2i.net> wrote:
: > > > > The chip does not handle a clear-stall request on the control pipe to
: > > > > clear-stall on the interrupt pipe. The result is that the interrupt
: > > > > pipe stops, or at least all buffers are cleared.
: > > > >
: 
: The following is part of the usb firmware from Micrcohip.

I never learned the details, but a client of mine was able to get
fixes from Microchip for their product.  The exact problem was that
endpoint stall clearing didn't work for these devices and it was a
firmware bug.

Warner