USB: make usb-skeleton honor O_NONBLOCK in write path
usb:usb-skeleton: honor O_NONBLOCK in write path nonblocking writes are allowed by using down_trylock if necessary to reserve an URB Signed-off-by:Oliver Neukum <oliver@neukum.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de>
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