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sfp: fix module initialisation with netdev already up 

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+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2018-07-10 12:05:36 +01:00 committed by David S. Miller
parent f20a4c46b9
commit 576cd32082
1 changed files with 2 additions and 2 deletions
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4
drivers/net/phy/sfp-bus.c
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@ -349,7 +349,6 @@ 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;
}
@ -364,7 +363,6 @@ 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;
}
@ -440,6 +438,7 @@ static void sfp_upstream_clear(struct sfp_bus *bus)
{
bus->upstream_ops = NULL;
bus->upstream = NULL;
bus->netdev->sfp_bus = NULL;
bus->netdev = NULL;
}
@ -468,6 +467,7 @@ 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);