centos man page for netdev_has_upper_dev

NETDEV_HAS_UPPER_DEV(9) 				      Network device support					   NETDEV_HAS_UPPER_DEV(9)

NAME
       netdev_has_upper_dev - Check if device is linked to an upper device

SYNOPSIS
       bool netdev_has_upper_dev(struct net_device * dev, struct net_device * upper_dev);

ARGUMENTS
       dev
	   device

       upper_dev
	   upper device to check

DESCRIPTION
       Find out if a device is linked to specified upper device and return true in case it is. Note that this checks only immediate upper device,
       not through a complete stack of devices. The caller must hold the RTNL lock.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   NETDEV_HAS_UPPER_DEV(9)