Merge branch 'bridge-prepare-lockless-br_port_fill_attrs-i'

Eric Dumazet says:

====================
bridge: prepare lockless br_port_fill_attrs() (I)

medium-term goal is to allow "ip link show" dump commands to run without RTNL.

This round of patches adds/fixes some lockess accesses in bridge.

This is not complete, more patches will come later.

Ultimately all changes to p->flags should use set_bit()/clear_bit().

I repeat (AI agents might read this cover ?):

Many p->flags accesses are racy, and will hopefully be fixed in a
future series.
====================

Link: https://patch.msgid.link/20260604141343.2124500-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>