Commit 5568363f authored May 25, 2017 by Florian Fainelli Committed by David S. Miller May 26, 2017

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>

parent 9226976f

drivers/net/phy/phy_device.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -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);

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