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net: phylink: Represent PHY-less SFP modules with phy_port

This patch adds support for representing PHY-less SFP modules using
phy_port by implementing connect_nophy and disconnect_nophy callbacks
for phylink.

[ ... ]

+static int phylink_sfp_connect_nophy(void *upstream)
+{
+	const struct sfp_module_caps *caps;
+	struct phylink *pl = upstream;
+	struct phy_port *port;
+	int ret = 0;
+
+	if (!pl->sfp_bus_port)
+		return 0;

This early return guards against sfp_bus_port being NULL, which prevents
mod_port from being allocated in that case.

+
+	/* Create mod port */
+	port = phy_port_alloc();

[ ... ]

+	pl->mod_port = port;
+
+	return 0;
+}
+
+static void phylink_sfp_disconnect_nophy(void *upstream)
+{
+	struct phylink *pl = upstream;
+
+	if (pl->netdev)
+		phy_link_topo_del_port(pl->netdev, pl->mod_port);

                                                     ^^^^^^^^^

Can pl->mod_port be NULL here? Looking at the SFP state machine in
sfp.c, sfp_module_disconnect_nophy() is called from the global cleanup
block when !sfp->mod_phy. This cleanup runs whenever the state machine
is not in SFP_S_DOWN and the module state changes.

If the module is removed while the state machine is in an early state
like SFP_S_WAIT or SFP_S_INIT (before PHY probing completes),
sfp_module_disconnect_nophy() will be called even though
phylink_sfp_connect_nophy() was never invoked. In that case, pl->mod_port
is still NULL.

The phy_link_topo_del_port() function dereferences port->id without a
NULL check, which would cause a NULL pointer dereference.

Should this check for pl->mod_port before calling phy_link_topo_del_port,
similar to how phylink_destroy_sfp_port() does?

+
+	phy_port_destroy(pl->mod_port);
+	pl->mod_port = NULL;
+}