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When a tunnel is closed, l2tp_tunnel_closeall closes all sessions in the tunnel. Move the work of deleting each session to the work queue so that sessions are deleted using the same codepath whether they are closed by user API request or their parent tunnel is closing. This also avoids the locking dance in l2tp_tunnel_closeall where the tunnel's session list lock was unlocked and relocked in the loop. In l2tp_exit_net, use drain_workqueue instead of flush_workqueue because the processing of tunnel_delete work may queue session_delete work items which must also be processed. Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>