netdev_master_upper_dev_link
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## Name

netdev_master_upper_dev_link — Add a master link to the upper device

## Synopsis

`int netdev_master_upper_dev_link (` | struct net_device * dev,
| struct net_device * upper_dev`)`;

## Arguments

`dev`

  device

`upper_dev`

  new upper device

## Description

Adds a link to device which is upper to this one. In this case, only one master upper device can be linked, although other non-master devices might be linked as well. The caller must hold the RTNL lock. On a failure a negative errno code is returned. On success the reference counts are adjusted and the function returns zero.

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