mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-02-24 07:46:28 -05:00
43c7ce69d2
Once RTNL is replaced with rtnl_net_lock(), we need a mechanism to guarantee that rtnl_link_ops is alive during inflight RTM_NEWLINK even when its module is being unloaded. Let's use SRCU to protect ops. rtnl_link_ops_get() now iterates link_ops under RCU and returns SRCU-protected ops pointer. The caller must call rtnl_link_ops_put() to release the pointer after the use. Also, __rtnl_link_unregister() unlinks the ops first and calls synchronize_srcu() to wait for inflight RTM_NEWLINK requests to complete. Note that link_ops needs to be protected by its dedicated lock when RTNL is removed. Suggested-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>