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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: 4e51bf44a0 ("net: bridge: move the switchdev object replay helpers to "push" mode")
Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
f7a70d650b