diff --git a/build_patches/openwrt/0020-kernel-5.4-backport-fix-to-allow-bridge-in-bridge-co.patch b/build_patches/openwrt/0020-kernel-5.4-backport-fix-to-allow-bridge-in-bridge-co.patch
new file mode 100644
index 00000000..a55de5d9
--- /dev/null
+++ b/build_patches/openwrt/0020-kernel-5.4-backport-fix-to-allow-bridge-in-bridge-co.patch
@@ -0,0 +1,101 @@
+From c50ece58c41647880cc74c927d98b465cdfbdad8 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Fabian=20Bl=C3=A4se?= <fabian@blaese.de>
+Date: Sun, 29 Aug 2021 21:21:35 +0200
+Subject: [PATCH] kernel: backport switchdev fix for bridge in bridge
+ configurations
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This patch fixes the forwarding behavior of bridge in bridge
+configurations with DSA.
+
+Without it, the configuration of the upper bridge might overwrite
+settings of the lower bridge. For example, a vlan-aware bridge
+with DSA interfaces in it might be offloaded to the DSA hardware. If the
+bridge interface itself gets slave of a different bridge without vlan
+filtering, the vlan filtering setting of the lower bridge is overwritten
+by the upper bridge, which results in an incorrect hardware
+configuration.
+
+This was backported from kernel 5.7.
+
+Ref: https://lore.kernel.org/netdev/20191222192235.GK25745@shell.armlinux.org.uk/
+Fixes: FS#3996
+Signed-off-by: Fabian Bläse <fabian@blaese.de>
+---
+ ...-not-propagate-bridge-updates-across.patch | 60 +++++++++++++++++++
+ 1 file changed, 60 insertions(+)
+ create mode 100644 target/linux/generic/backport-5.4/790-v5.7-net-switchdev-do-not-propagate-bridge-updates-across.patch
+
+diff --git a/target/linux/generic/backport-5.4/790-v5.7-net-switchdev-do-not-propagate-bridge-updates-across.patch b/target/linux/generic/backport-5.4/790-v5.7-net-switchdev-do-not-propagate-bridge-updates-across.patch
+new file mode 100644
+index 000000000000..bc8014b772f8
+--- /dev/null
++++ b/target/linux/generic/backport-5.4/790-v5.7-net-switchdev-do-not-propagate-bridge-updates-across.patch
+@@ -0,0 +1,60 @@
++From 07c6f9805f12f1bb538ef165a092b300350384aa Mon Sep 17 00:00:00 2001
++From: Russell King <rmk+kernel@armlinux.org.uk>
++Date: Wed, 26 Feb 2020 17:14:21 +0000
++Subject: [PATCH] net: switchdev: do not propagate bridge updates across
++ bridges
++
++When configuring a tree of independent bridges, propagating changes
++from the upper bridge across a bridge master to the lower bridge
++ports brings surprises.
++
++For example, a lower bridge may have vlan filtering enabled.  It
++may have a vlan interface attached to the bridge master, which may
++then be incorporated into another bridge.  As soon as the lower
++bridge vlan interface is attached to the upper bridge, the lower
++bridge has vlan filtering disabled.
++
++This occurs because switchdev recursively applies its changes to
++all lower devices no matter what.
++
++Reviewed-by: Ido Schimmel <idosch@mellanox.com>
++Tested-by: Ido Schimmel <idosch@mellanox.com>
++Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
++Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
++Signed-off-by: David S. Miller <davem@davemloft.net>
++---
++ net/switchdev/switchdev.c | 9 +++++++++
++ 1 file changed, 9 insertions(+)
++
++diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
++index 60630762a748b7..f25604d68337cf 100644
++--- a/net/switchdev/switchdev.c
+++++ b/net/switchdev/switchdev.c
++@@ -476,6 +476,9 @@ static int __switchdev_handle_port_obj_a
++ 	 * necessary to go through this helper.
++ 	 */
++ 	netdev_for_each_lower_dev(dev, lower_dev, iter) {
+++		if (netif_is_bridge_master(lower_dev))
+++			continue;
+++
++ 		err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info,
++ 						      check_cb, add_cb);
++ 		if (err && err != -EOPNOTSUPP)
++@@ -528,6 +531,9 @@ static int __switchdev_handle_port_obj_d
++ 	 * necessary to go through this helper.
++ 	 */
++ 	netdev_for_each_lower_dev(dev, lower_dev, iter) {
+++		if (netif_is_bridge_master(lower_dev))
+++			continue;
+++
++ 		err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info,
++ 						      check_cb, del_cb);
++ 		if (err && err != -EOPNOTSUPP)
++@@ -579,6 +585,9 @@ static int __switchdev_handle_port_attr_
++ 	 * necessary to go through this helper.
++ 	 */
++ 	netdev_for_each_lower_dev(dev, lower_dev, iter) {
+++		if (netif_is_bridge_master(lower_dev))
+++			continue;
+++
++ 		err = __switchdev_handle_port_attr_set(lower_dev, port_attr_info,
++ 						       check_cb, set_cb);
++ 		if (err && err != -EOPNOTSUPP)
+-- 
+2.33.0
+