--- zzzz-none-000/linux-5.15.111/net/ipv4/igmp.c	2023-05-11 14:00:40.000000000 +0000
+++ puma7-atom-6670-761/linux-5.15.111/net/ipv4/igmp.c	2024-02-07 10:23:30.000000000 +0000
@@ -1319,7 +1319,14 @@
 		/* IGMPv3 */
 		igmpv3_add_delrec(in_dev, im, gfp);
 
+#ifdef CONFIG_LTQ_MCAST_LATENCY_OPTIMIZATION
+		in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
+		in_dev_hold(in_dev);
+		igmp_ifc_timer_expire(&in_dev->mr_ifc_timer);
+#else
 		igmp_ifc_event(in_dev);
+#endif
+
 	}
 #endif
 }
@@ -1353,9 +1360,14 @@
 
 	im->unsolicit_count = READ_ONCE(net->ipv4.sysctl_igmp_qrv);
 	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
+# ifdef CONFIG_LTQ_MCAST_LATENCY_OPTIMIZATION
+		refcount_inc(&im->refcnt);
+		igmp_timer_expire(&im->timer);
+# else
 		spin_lock_bh(&im->lock);
 		igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
 		spin_unlock_bh(&im->lock);
+# endif
 		return;
 	}
 	/* else, v3 */
@@ -1367,7 +1379,13 @@
 	if (im->sfmode == MCAST_EXCLUDE)
 		im->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
 
+# ifdef CONFIG_LTQ_MCAST_LATENCY_OPTIMIZATION
+	in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
+	in_dev_hold(in_dev);
+	igmp_ifc_timer_expire(&in_dev->mr_ifc_timer);
+# else
 	igmp_ifc_event(in_dev);
+# endif
 #endif
 }