| Message ID | 20240409125738.1824983-2-leitao@debian.org |
|---|---|
| State | New |
| Headers | show |
| Series | allocate dummy device dynamically | expand |
On Tue, 9 Apr 2024 05:57:15 -0700 Breno Leitao wrote: > 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 for dummy devices, 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()). There's a small fuzz when applying due to the phy topo changes landing, please rebase, the CI didn't ingest it right.
diff --git a/net/core/dev.c b/net/core/dev.c index 92f5bddbc2de..bf0a335781aa 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -11051,7 +11051,8 @@ void free_netdev(struct net_device *dev) dev->xdp_bulkq = NULL; /* 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; }
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 for dummy devices, 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> --- net/core/dev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)