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authorKuniyuki Iwashima <kuniyu@amazon.com>2024-11-07 16:48:15 -0800
committerJakub Kicinski <kuba@kernel.org>2024-11-11 17:26:51 -0800
commit6b57ff21a3109b1dba2d286ff415463e6fb1fca3 (patch)
tree422ce0bd4dd0ae915e044478a5fd83a1a5a2a977 /scripts/lib/kdoc/kdoc_parser.py
parentd5ec8d91f82ef78405b506737952dec8af95a95b (diff)
rtnetlink: Protect link_ops by mutex.
rtnl_link_unregister() holds RTNL and calls synchronize_srcu(), but rtnl_newlink() will acquire SRCU frist and then RTNL. Then, we need to unlink ops and call synchronize_srcu() outside of RTNL to avoid the deadlock. rtnl_link_unregister() rtnl_newlink() ---- ---- lock(rtnl_mutex); lock(&ops->srcu); lock(rtnl_mutex); sync(&ops->srcu); Let's move as such and add a mutex to protect link_ops. Now, link_ops is protected by its dedicated mutex and rtnl_link_register() no longer needs to hold RTNL. While at it, we move the initialisation of ops->dellink and ops->srcu out of the mutex scope. Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Link: https://patch.msgid.link/20241108004823.29419-3-kuniyu@amazon.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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