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Recent commit ed8ebee6def7 ("l2tp: have l2tp_ip_destroy_sock use
ip_flush_pending_frames") was incorrect in that l2tp_ip does not use
socket cork and ip_flush_pending_frames is for sockets that do. Use
__skb_queue_purge instead and remove the unnecessary lock.
Also unexport ip_flush_pending_frames since it was originally exported
in commit 4ff8863419cd ("ipv4: export ip_flush_pending_frames") for
l2tp and is not used by other modules.
Suggested-by: xiyou.wangcong@gmail.com
Signed-off-by: James Chapman <jchapman@katalix.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20240819143333.3204957-1-jchapman@katalix.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>