[PATCH net-next] net: phylink: Remove redundant netdev.phydev assignment

[Richard Cochran]

As a part of working on MII time stamping infrastructure, I was trying
to figure out how netdev->phydev gets assigned, and I stumbled across
this.  Ever since the new phylink code came in, the field is assigned
twice.

The function, phylink_connect_phy(), calls

        phy_attach_direct()
        phylink_bringup_phy()

and phy_attach_direct() sets

        dev->phydev = phydev;

but phylink_bringup_phy() then sets the same field again:

        pl->netdev->phydev = phy;

Similarly, the function, phylink_of_phy_connect(), calls

        of_phy_attach()
                phy_attach_direct()
        phylink_bringup_phy()

The removal code is also duplicated:

phylink_disconnect_phy()
        pl->netdev->phydev = NULL;
        phy_disconnect()
                phy_detach()
                        phydev->attached_dev->phydev = NULL;

This patch removes the redundant assignments, restricting manipulation
of the netdev.phydev field to phy_attach_direct() and phy_detach().

Signed-off-by: Richard Cochran <richardcoch...@gmail.com>
---
 drivers/net/phy/phylink.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 6ac8b29b2dc3..867ffd654daf 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -679,7 +679,6 @@ static int phylink_bringup_phy(struct phylink *pl, struct 
phy_device *phy)
 
        mutex_lock(&phy->lock);
        mutex_lock(&pl->state_mutex);
-       pl->netdev->phydev = phy;
        pl->phydev = phy;
        linkmode_copy(pl->supported, supported);
        linkmode_copy(pl->link_config.advertising, config.advertising);
@@ -817,7 +816,6 @@ void phylink_disconnect_phy(struct phylink *pl)
        if (phy) {
                mutex_lock(&phy->lock);
                mutex_lock(&pl->state_mutex);
-               pl->netdev->phydev = NULL;
                pl->phydev = NULL;
                mutex_unlock(&pl->state_mutex);
                mutex_unlock(&phy->lock);
-- 
2.11.0