Kuniyuki Iwashima d5ec8d91f8
rtnetlink: Remove __rtnl_link_unregister(). ...
rtnl_link_unregister() holds RTNL and calls __rtnl_link_unregister(),
where we call synchronize_srcu() to wait inflight RTM_NEWLINK requests
for per-netns RTNL.
We put synchronize_srcu() in __rtnl_link_unregister() due to ifb.ko
and dummy.ko.
However, rtnl_newlink() will acquire SRCU before RTNL later in this
series. Then, lockdep will detect the deadlock:
rtnl_link_unregister() rtnl_newlink()
---- ----
lock(rtnl_mutex);
lock(&ops->srcu);
lock(rtnl_mutex);
sync(&ops->srcu);
To avoid the problem, we must call synchronize_srcu() before RTNL in
rtnl_link_unregister().
As a preparation, let's remove __rtnl_link_unregister().
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com >
Link: https://patch.msgid.link/20241108004823.29419-2-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org >
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