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net: phy: Create sysfs reciprocal links for attached_dev/phydev 

There is currently no way for a program scanning /sys to know whether a
network device is attached to a particular PHY device, just like the PHY
device is not pointed back to its attached network device.

Create a symbolic link in the network device's namespace named "phydev"
which points to the PHY device and create a symbolic link in the PHY
device's namespace named "attached_dev" that points back to the network
device. These links are set up during phy_attach_direct() and removed
during phy_detach() for symetry.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Florian Fainelli 2017-05-25 09:21:41 -07:00 committed by David S. Miller
parent 9226976f9b
commit 5568363f0c
1 changed files with 11 additions and 0 deletions
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11
drivers/net/phy/phy_device.c
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@ -960,6 +960,15 @@ int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
phydev->attached_dev = dev;
dev->phydev = phydev;
err = sysfs_create_link(&phydev->mdio.dev.kobj, &dev->dev.kobj,
"attached_dev");
if (err)
goto error;
err = sysfs_create_link(&dev->dev.kobj, &phydev->mdio.dev.kobj,
"phydev");
if (err)
goto error;
phydev->dev_flags = flags;
@ -1050,6 +1059,8 @@ void phy_detach(struct phy_device *phydev)
struct mii_bus *bus;
int i;
sysfs_remove_link(&dev->dev.kobj, "phydev");
sysfs_remove_link(&phydev->mdio.dev.kobj, "attached_dev");
phydev->attached_dev->phydev = NULL;
phydev->attached_dev = NULL;
phy_suspend(phydev);