diff --git a/target/linux/generic/backport-5.4/773-v5.12-net-dsa-move-switchdev-event-implementation-under-th.patch b/target/linux/generic/backport-5.4/773-v5.12-net-dsa-move-switchdev-event-implementation-under-th.patch
new file mode 100644
index 0000000..acc6e16
--- /dev/null
+++ b/target/linux/generic/backport-5.4/773-v5.12-net-dsa-move-switchdev-event-implementation-under-th.patch
@@ -0,0 +1,85 @@
+From 447d290a58bd335d68f665713842365d3d6447df Mon Sep 17 00:00:00 2001
+From: Vladimir Oltean <vladimir.oltean@nxp.com>
+Date: Wed, 6 Jan 2021 11:51:33 +0200
+Subject: [PATCH] net: dsa: move switchdev event implementation under the same
+ switch/case statement
+
+We'll need to start listening to SWITCHDEV_FDB_{ADD,DEL}_TO_DEVICE
+events even for interfaces where dsa_slave_dev_check returns false, so
+we need that check inside the switch-case statement for SWITCHDEV_FDB_*.
+
+This movement also avoids a useless allocation / free of switchdev_work
+on the untreated "default event" case.
+
+Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
+Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ net/dsa/slave.c | 35 ++++++++++++++++-------------------
+ 1 file changed, 16 insertions(+), 19 deletions(-)
+
+--- a/net/dsa/slave.c
++++ b/net/dsa/slave.c
+@@ -1638,31 +1638,29 @@ static int dsa_slave_switchdev_event(str
+ 	struct dsa_port *dp;
+ 	int err;
+ 
+-	if (event == SWITCHDEV_PORT_ATTR_SET) {
++	switch (event) {
++	case SWITCHDEV_PORT_ATTR_SET:
+ 		err = switchdev_handle_port_attr_set(dev, ptr,
+ 						     dsa_slave_dev_check,
+ 						     dsa_slave_port_attr_set);
+ 		return notifier_from_errno(err);
+-	}
+-
+-	if (!dsa_slave_dev_check(dev))
+-		return NOTIFY_DONE;
++	case SWITCHDEV_FDB_ADD_TO_DEVICE:
++	case SWITCHDEV_FDB_DEL_TO_DEVICE:
++		if (!dsa_slave_dev_check(dev))
++			return NOTIFY_DONE;
+ 
+-	dp = dsa_slave_to_port(dev);
++		dp = dsa_slave_to_port(dev);
+ 
+-	switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
+-	if (!switchdev_work)
+-		return NOTIFY_BAD;
+-
+-	INIT_WORK(&switchdev_work->work,
+-		  dsa_slave_switchdev_event_work);
+-	switchdev_work->ds = dp->ds;
+-	switchdev_work->port = dp->index;
+-	switchdev_work->event = event;
++		switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
++		if (!switchdev_work)
++			return NOTIFY_BAD;
++
++		INIT_WORK(&switchdev_work->work,
++			  dsa_slave_switchdev_event_work);
++		switchdev_work->ds = dp->ds;
++		switchdev_work->port = dp->index;
++		switchdev_work->event = event;
+ 
+-	switch (event) {
+-	case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
+-	case SWITCHDEV_FDB_DEL_TO_DEVICE:
+ 		fdb_info = ptr;
+ 
+ 		if (!fdb_info->added_by_user) {
+@@ -1675,13 +1673,12 @@ static int dsa_slave_switchdev_event(str
+ 		switchdev_work->vid = fdb_info->vid;
+ 
+ 		dev_hold(dev);
++		dsa_schedule_work(&switchdev_work->work);
+ 		break;
+ 	default:
+-		kfree(switchdev_work);
+ 		return NOTIFY_DONE;
+ 	}
+ 
+-	dsa_schedule_work(&switchdev_work->work);
+ 	return NOTIFY_OK;
+ }
+