[PATCH net] rxrpc: Restore removed timer deletion

[David Howells]

Eric Dumazet <edumazet at google.com> wrote:

> ok... so we have a timer and a work queue, both activating each other
> in kind of a ping pong ?

Yes.  I want to emit regular keepalive pokes.

> Any particular reason not using delayed works ?

Because there's a race between starting the keepalive timer when a new peer is
added and when the keepalive worker is resetting the timer for the next peer
in the list.  This is why I'm using timer_reduce().  delayed_work doesn't
currently have such a facility.  It's not simple to add because
try_to_grab_pending() as called from mod_delayed_work_on() cancels the timer -
which is not what I want it to do.

David