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19 .Nd indicate that a device can transmit again
21 .In sys/mac_provider.h
31 The MAC handle obtained from a call to
37 function is used by device drivers to indicate that the device
38 represented by the handle
40 can transmit data again.
41 It should only be called after the device driver has returned data from its
44 For more information on when this should be called, see both
47 .Sx Transmitting Data and Back Pressure
51 Device drivers should not hold any of their own locks when calling into
61 function may be called from