net: bridge: guard the switchdev replay helpers against a NULL notifier block
There is a desire to make the object and FDB replay helpers optional when moving them inside the bridge driver. For example a certain driver might not offload host MDBs and there is no case where the replay helpers would be of immediate use to it. So it would be nice if we could allow drivers to pass NULL pointers for the atomic and blocking notifier blocks, and the replay helpers to do nothing in that case. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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