From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Fainelli Subject: [PATCH net-next v2 1/3] net: phy: Create sysfs reciprocal links for attached_dev/phydev Date: Thu, 25 May 2017 09:21:41 -0700 Message-ID: <20170525162143.18319-2-f.fainelli@gmail.com> References: <20170525162143.18319-1-f.fainelli@gmail.com> Cc: davem@davemloft.net, andrew@lunn.ch, Florian Fainelli To: netdev@vger.kernel.org Return-path: Received: from mail-qk0-f194.google.com ([209.85.220.194]:33702 "EHLO mail-qk0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1165402AbdEYQVu (ORCPT ); Thu, 25 May 2017 12:21:50 -0400 Received: by mail-qk0-f194.google.com with SMTP id o85so30718329qkh.0 for ; Thu, 25 May 2017 09:21:49 -0700 (PDT) In-Reply-To: <20170525162143.18319-1-f.fainelli@gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: 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 --- 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 1219eeab69d1..8151477c7027 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); -- 2.9.3