Patch "net: bridge: switchdev: Ensure deferred event delivery on unoffload" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    net: bridge: switchdev: Ensure deferred event delivery on unoffload

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-bridge-switchdev-ensure-deferred-event-delivery-.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 0f8b9913d1de9daabe3b14250e5eb0366e35468c
Author: Tobias Waldekranz <tobias@xxxxxxxxxxxxxx>
Date:   Wed Feb 14 22:40:04 2024 +0100

    net: bridge: switchdev: Ensure deferred event delivery on unoffload
    
    [ Upstream commit f7a70d650b0b6b0134ccba763d672c8439d9f09b ]
    
    When unoffloading a device, it is important to ensure that all
    relevant deferred events are delivered to it before it disassociates
    itself from the bridge.
    
    Before this change, this was true for the normal case when a device
    maps 1:1 to a net_bridge_port, i.e.
    
       br0
       /
    swp0
    
    When swp0 leaves br0, the call to switchdev_deferred_process() in
    del_nbp() makes sure to process any outstanding events while the
    device is still associated with the bridge.
    
    In the case when the association is indirect though, i.e. when the
    device is attached to the bridge via an intermediate device, like a
    LAG...
    
        br0
        /
      lag0
      /
    swp0
    
    ...then detaching swp0 from lag0 does not cause any net_bridge_port to
    be deleted, so there was no guarantee that all events had been
    processed before the device disassociated itself from the bridge.
    
    Fix this by always synchronously processing all deferred events before
    signaling completion of unoffloading back to the driver.
    
    Fixes: 4e51bf44a03a ("net: bridge: move the switchdev object replay helpers to "push" mode")
    Signed-off-by: Tobias Waldekranz <tobias@xxxxxxxxxxxxxx>
    Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index 6a7cb01f121c7..7b41ee8740cbb 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -804,6 +804,16 @@ static void nbp_switchdev_unsync_objs(struct net_bridge_port *p,
 	br_switchdev_mdb_replay(br_dev, dev, ctx, false, blocking_nb, NULL);
 
 	br_switchdev_vlan_replay(br_dev, ctx, false, blocking_nb, NULL);
+
+	/* Make sure that the device leaving this bridge has seen all
+	 * relevant events before it is disassociated. In the normal
+	 * case, when the device is directly attached to the bridge,
+	 * this is covered by del_nbp(). If the association was indirect
+	 * however, e.g. via a team or bond, and the device is leaving
+	 * that intermediate device, then the bridge port remains in
+	 * place.
+	 */
+	switchdev_deferred_process();
 }
 
 /* Let the bridge know that this port is offloaded, so that it can assign a




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