Re: [PATCH net] amt: tear down every amt device on an unregistering lower

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu,  5 Nov 2026 23:23:02 +0000 you wrote:
> amt_device_event() acts only on the amt device that
> amt_lookup_upper_dev() returns, which is the first amt device bound to
> the event's lower. Several amt devices can share one lower, for
> example two gateways.
> 
> On NETDEV_UNREGISTER, only the first device is unlinked and
> unregistered. The others stay upper-linked to the lower, and
> unregister_netdevice_many_notify() warns, because the notifier chain
> must detach every upper device. They also still hold a reference on
> the lower, so each is torn down only when netdev_wait_allrefs_any(),
> called from netdev_run_todo(), rebroadcasts NETDEV_UNREGISTER. By then
> the lower's sysfs directory is gone, so unlinking it trips a kernfs
> WARN, and unregistering it from inside the rebroadcast trips the WARN
> in __rtnl_unlock(). On NETDEV_CHANGEMTU, only the first device is
> resized.
> 
> [...]

Here is the summary with links:
  - [net] amt: tear down every amt device on an unregistering lower
    https://git.kernel.org/netdev/net/c/7262e999ebec

You are awesome, thank you!
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