Question about pipes and ugen

[M. Warner Losh]

In message: <41B0DD18.9080300 at elischer.org>
            Julian Elischer <julian at elischer.org> writes:
: 
: 
: M. Warner Losh wrote:
: 
: >In message: <41B0C118.8070001 at elischer.org>
: >            Julian Elischer <julian at elischer.org> writes:
: >: I didn't say stack.. I said libusb (excepty I spelled it usblib)
: >
: >OK.  I got confused...
: >
: >: it recovers on several machines where FreeBSD looses communications with 
: >: the target after an error.
: >
: >Hmmmm.  Actually, FreeBSD does do the ClearFeature(Halt) on opening of
: >pipes by the driver (which ugen does each time the pipe subdevice is
: >opened).  ClearFeature(Stall) was unfortunately typed from memory
: >rather than looking at the standard (section 9.4.5).  What were you
: >thinking about changing in this area?
: >
: 
: BTW it does the halt too late.. by that time it has already tried to do 
: other opertations that
: have probably timed out (at least on the stupid device I have) so it's 
: aborted before it ever gets
: to the ClearFeature(Halt).

It does this as soon as the driver opens the pipe.  Nothing can have
happened on the pipe before that.  I don't understand what you are
saying here.  It might also do it other times, but it definitely does
it on open...

Warner