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This patch introduces netdev_walk_all_upper_dev_rcu,
netdev_walk_all_lower_dev and netdev_walk_all_lower_dev_rcu. These
functions recursively walk the adj_list of devices to determine all upper
and lower devices.
The functions take a callback function that is invoked for each device
in the list. If the callback returns non-0, the walk is terminated and
the functions return that code back to callers.
v3
- simplified netdev_has_upper_dev_all_rcu and __netdev_has_upper_dev and
removed typecast as suggested by Stephen
v2
- fixed definition of netdev_next_lower_dev_rcu to mirror the upper_dev
version.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1a3f060c1a