commit 2ef188d3f196f2713c5f664f26e18e574992f04f
Author: Vadim Fedorenko <vadfed@meta.com>
Date:   Fri Jan 13 12:38:44 2023 -0800

    port: start sync rx timer on grant
    
    In case of broken network there is a possibility of having management
    packets with proper data but absolute absence of sync packets. In such
    case the selected best master will stuck in HAVE_SYDY state without
    actually synchronising and will never fail because sync rx timeout timer
    is armed just after first receive of both SYNC and FOLLOW-UP packets.
    
    The patch arms sync rx timeout timer once sync grant is received.
    
    Signed-off-by: Vadim Fedorenko <vadfed@meta.com>

diff --git a/port.c b/port.c
index 02b49a1..558a422 100644
--- a/port.c
+++ b/port.c
@@ -1235,7 +1235,7 @@ int port_set_qualification_tmo(struct port *p)
 		       1+clock_steps_removed(p->clock), p->logAnnounceInterval);
 }
 
-static int port_set_sync_rx_tmo(struct port *p)
+int port_set_sync_rx_tmo(struct port *p)
 {
 	return set_tmo_log(p->fda.fd[FD_SYNC_RX_TIMER],
 			   p->syncReceiptTimeout, p->logSyncInterval);
diff --git a/port_private.h b/port_private.h
index d27dceb..24d0045 100644
--- a/port_private.h
+++ b/port_private.h
@@ -182,6 +182,7 @@ int port_is_enabled(struct port *p);
 void port_link_status(void *ctx, int index, int linkup);
 int port_set_announce_tmo(struct port *p);
 int port_set_delay_tmo(struct port *p);
+int port_set_sync_rx_tmo(struct port *p);
 int port_set_qualification_tmo(struct port *p);
 void port_show_transition(struct port *p, enum port_state next,
 			  enum fsm_event event);
diff --git a/unicast_client.c b/unicast_client.c
index 633a4fe..5b46d1c 100644
--- a/unicast_client.c
+++ b/unicast_client.c
@@ -512,6 +512,7 @@ void unicast_client_grant(struct port *p, struct ptp_message *m,
 			}
 			unicast_client_set_renewal(p, ucma, g->durationField);
 			clock_sync_interval(p->clock, g->logInterMessagePeriod);
+			port_set_sync_rx_tmo(p);
 			break;
 		}
 		break;