[PATCH net 2/2] sfp: fix module initialisation with netdev already up

[Russell King]

It was been observed that with a particular order of initialisation,
the netdev can be up, but the SFP module still has its TX_DISABLE
signal asserted.  This occurs when the network device brought up before
the SFP kernel module has been inserted by userspace.

This occurs because sfp-bus layer does not hear about the change in
network device state, and so assumes that it is still down.  Set
netdev->sfp when the upstream is registered to work around this problem.

Signed-off-by: Russell King <rmk+ker...@armlinux.org.uk>
---
 drivers/net/phy/sfp-bus.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index e355e7db54a7..5e5fcc33421e 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -342,7 +342,6 @@ static int sfp_register_bus(struct sfp_bus *bus)
        }
        if (bus->started)
                bus->socket_ops->start(bus->sfp);
-       bus->netdev->sfp_bus = bus;
        bus->registered = true;
        return 0;
 }
@@ -357,7 +356,6 @@ static void sfp_unregister_bus(struct sfp_bus *bus)
                if (bus->phydev && ops && ops->disconnect_phy)
                        ops->disconnect_phy(bus->upstream);
        }
-       bus->netdev->sfp_bus = NULL;
        bus->registered = false;
 }
 
@@ -433,6 +431,7 @@ static void sfp_upstream_clear(struct sfp_bus *bus)
 {
        bus->upstream_ops = NULL;
        bus->upstream = NULL;
+       bus->netdev->sfp_bus = NULL;
        bus->netdev = NULL;
 }
 
@@ -461,6 +460,7 @@ struct sfp_bus *sfp_register_upstream(struct fwnode_handle 
*fwnode,
                bus->upstream_ops = ops;
                bus->upstream = upstream;
                bus->netdev = ndev;
+               ndev->sfp_bus = bus;
 
                if (bus->sfp) {
                        ret = sfp_register_bus(bus);
-- 
2.7.4