diff options
| author | Antoine Tenart <atenart@kernel.org> | 2021-10-07 19:16:50 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-10-08 19:02:34 +0300 |
| commit | 75ea27d0d62281c31ee259c872dfdeb072cf5e39 (patch) | |
| tree | 1094255e54478f807aa24ec44aa5d46682dce13b /include | |
| parent | 12e6d7e6410290cd69c30881a8dcd60ef0eb87c2 (diff) | |
| download | linux-75ea27d0d62281c31ee259c872dfdeb072cf5e39.tar.xz | |
net: introduce a function to check if a netdev name is in use
__dev_get_by_name is currently used to either retrieve a net device
reference using its name or to check if a name is already used by a
registered net device (per ns). In the later case there is no need to
return a reference to a net device.
Introduce a new helper, netdev_name_in_use, to check if a name is
currently used by a registered net device without leaking a reference
the corresponding net device. This helper uses netdev_name_node_lookup
instead of __dev_get_by_name as we don't need the extra logic retrieving
a reference to the corresponding net device.
Signed-off-by: Antoine Tenart <atenart@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index d79163208dfd..15f4a658e436 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -2955,6 +2955,7 @@ struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags, struct net_device *dev_get_by_name(struct net *net, const char *name); struct net_device *dev_get_by_name_rcu(struct net *net, const char *name); struct net_device *__dev_get_by_name(struct net *net, const char *name); +bool netdev_name_in_use(struct net *net, const char *name); int dev_alloc_name(struct net_device *dev, const char *name); int dev_open(struct net_device *dev, struct netlink_ext_ack *extack); void dev_close(struct net_device *dev); |