1NETDEV_HAS_UPPER_DEV(9)     Network device support     NETDEV_HAS_UPPER_DEV(9)
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NAME

6       netdev_has_upper_dev - Check if device is linked to an upper device
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SYNOPSIS

9       bool netdev_has_upper_dev(struct net_device * dev,
10                                 struct net_device * upper_dev);
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ARGUMENTS

13       dev
14           device
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16       upper_dev
17           upper device to check
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DESCRIPTION

20       Find out if a device is linked to specified upper device and return
21       true in case it is. Note that this checks only immediate upper device,
22       not through a complete stack of devices. The caller must hold the RTNL
23       lock.
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26Kernel Hackers Manual 3.10         June 2019           NETDEV_HAS_UPPER_DEV(9)
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