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net: free_netdev: exit earlier if dummy 

For dummy devices, exit earlier at free_netdev() instead of executing
the whole function. This is necessary, because dummy devices are
special, and shouldn't have the second part of the function executed.

Otherwise reg_state, which is NETREG_DUMMY, will be overwritten and
there will be no way to identify that this is a dummy device. Also, this
device do not need the final put_device(), since dummy devices are not
registered (through register_netdevice()), where the device reference is
increased (at netdev_register_kobject()/device_add()).

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Breno Leitao 2024-04-22 05:38:55 -07:00 committed by David S. Miller
parent c6e7f27684
commit f8d05679fb
1 changed files with 2 additions and 1 deletions
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3
net/core/dev.c
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@ -11066,7 +11066,8 @@ void free_netdev(struct net_device *dev)
phy_link_topo_destroy(dev->link_topo);
/* Compatibility with error handling in drivers */
if (dev->reg_state == NETREG_UNINITIALIZED) {
if (dev->reg_state == NETREG_UNINITIALIZED ||
dev->reg_state == NETREG_DUMMY) {
netdev_freemem(dev);
return;
}