Hello:
This patch was applied to netdev/net.git (main) by Jakub Kicinski kuba@kernel.org:
On Mon, 21 Aug 2023 21:48:48 +0200 you wrote:
The automatic recalculation of the maximum allowed MTU is usually triggered by code sections which are already rtnl lock protected by callers outside of batman-adv. But when the fragmentation setting is changed via batman-adv's own batadv genl family, then the rtnl lock is not yet taken.
But dev_set_mtu requires that the caller holds the rtnl lock because it uses netdevice notifiers. And this code will then fail the check for this lock:
[...]
Here is the summary with links: - [net] batman-adv: Hold rtnl lock during MTU update via netlink https://git.kernel.org/netdev/net/c/987aae75fc10
You are awesome, thank you!