git: kernel/usb4bsd: Apply FreeBSD r278503

[Markus Pfeiffer]

commit aaad50921805526b125d392d61def9e0142923ca
Author: Markus Pfeiffer <markus.pfeiffer at morphism.de>
Date:   Sun Feb 22 20:51:21 2015 +0000

    kernel/usb4bsd: Apply FreeBSD r278503
    
    This updates the original patch r274918, which had the following
    description:
    
    Don't use the synchronization endpoint unless referenced by the
    isochronous endpoint descriptor used for the data transfers, hence the
    synchronization feature might not be supposed to be supported [yet].
    This makes seamless playback synced with the USB HOST clock work with
    the DN32-USB module for Midas audio systems and possibly other similar
    products from Klark Teknik.

Summary of changes:
 sys/bus/u4b/audio/uaudio.c | 146 ++++++++++++++++++++++++++-------------------
 1 file changed, 84 insertions(+), 62 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/aaad50921805526b125d392d61def9e0142923ca


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