tsproc: Fix time stamp handling with P2P one shot mode.

When the P2P link partner is using one shot mode, the residence time
in the peer (t3 - t2) is reflected in the correction field of the
peer delay response message, and t2 and t3 are both zero.

The function port_peer_delay() calls clock_peer_delay(), passing in
the zero valued 't2' to the 'rx' argument.  The latter function then
stores the zero value in the 't4' field of the clock's tsproc
instance.

As a result, tsproc_update_offset() returns an error to
clock_synchronize(), and so a slave clock will never leave the
"uncalibrated" state.

This patch fixes the issue by removing the test for a non-zero 't4'
field within the tsproc.

Acked-by: Miroslav Lichvar <[email protected]>
Signed-off-by: Richard Cochran <[email protected]>

tsproc.c

@@ -164,7 +164,7 @@ int tsproc_update_offset(struct tsproc *tsp, tmv_t *offset, double *weight)
 	tmv_t delay, raw_delay = 0;
 
 	if (tmv_is_zero(tsp->t1) || tmv_is_zero(tsp->t2) ||
-	    tmv_is_zero(tsp->t3) || tmv_is_zero(tsp->t4))
+	    tmv_is_zero(tsp->t3))
 		return -1;
 
 	if (tsp->raw_mode || tsp->weighting)