commit bed9f4725de56c2c8518482105a11fb40bbec5df
Author: Miroslav Lichvar <mlichvar@redhat.com>
Date:   Tue Jun 23 14:54:43 2026 +0200

    phc2sys: Don't reconfigure static domain.
    
    When phc2sys is started without the -a and -O options, it creates a
    single static domain and uses the pmc agent only to get the TAI-UTC
    offset and watch for leap seconds without subscribing to the port state
    changes.
    
    If ptp4l stopped responding to pmc requests for a sufficiently long
    interval for the pmc agent to time out (3 missed responses - 180
    seconds), phc2sys logged "Lost connection to ptp4l #1" and stopped
    synchronizing the sink clocks. It was stuck in this state even after ptp4l
    started responding again. This was caused by the reconfiguration of the
    domain, which sets the source clock to NULL when the pmc agent is not
    getting updates.
    
    Add a new parameter to do_loop() to indicate that the domain
    configuration is fully static and disable the reconfiguration to avoid
    unsetting the source clock. This fixes phc2sys to keep synchronizing the
    clocks even when ptp4l is not responding.
    
    Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>

diff --git a/phc2sys.c b/phc2sys.c
index 1269d18..ad24db9 100644
--- a/phc2sys.c
+++ b/phc2sys.c
@@ -845,7 +845,7 @@ static int update_domain_clocks(struct domain *domain)
 	return 0;
 }
 
-static int do_loop(struct domain *domains, int n_domains)
+static int do_loop(struct domain *domains, int n_domains, int static_config)
 {
 	int i, state_changed, prev_sub;
 	struct timespec interval;
@@ -890,7 +890,8 @@ static int do_loop(struct domain *domains, int n_domains)
 		}
 
 		if (state_changed) {
-			reconfigure(domains, n_domains);
+			if (!static_config)
+				reconfigure(domains, n_domains);
 			state_changed = 0;
 		}
 
@@ -1535,7 +1536,7 @@ int main(int argc, char *argv[])
 				goto end;
 		}
 
-		r = do_loop(domains, n_domains);
+		r = do_loop(domains, n_domains, 0);
 		goto end;
 	}
 
@@ -1601,7 +1602,7 @@ int main(int argc, char *argv[])
 		servo_sync_interval(dst->servo, 1.0);
 		r = do_pps_loop(&domains[0], dst, pps_fd);
 	} else {
-		r = do_loop(&domains[0], 1);
+		r = do_loop(&domains[0], 1, 1);
 	}
 
 end: