IB/ehca: Fix static rate if path faster than link

The formula would yield -1 if the path is faster than the link, which
is wrong in a bad way (max throttling).  Clamp to 0, which is the
correct value.
Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ehca/ehca_av.c

@@ -76,6 +76,10 @@ int ehca_calc_ipd(struct ehca_shca *shca, int port,
 
 	link = ib_width_enum_to_int(pa.active_width) * pa.active_speed;
 
+	if (path >= link)
+		/* no need to throttle if path faster than link */
+		*ipd = 0;
+	else
 		/* IPD = round((link / path) - 1) */
 		*ipd = ((link + (path >> 1)) / path) - 1;