From 5568363f0cb358305b90ab3d3330f757943f6d0d Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Thu, 25 May 2017 09:21:41 -0700 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- drivers/net/phy/phy_device.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 0780e9f9e167..f84414b8f2ee 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -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); -- 2.20.1