From 2192bba03d80f829233bfa34506b428f71e531e7 Mon Sep 17 00:00:00 2001 From: Benjamin Segall Date: Tue, 30 May 2023 11:32:28 -0700 Subject: epoll: ep_autoremove_wake_function should use list_del_init_careful autoremove_wake_function uses list_del_init_careful, so should epoll's more aggressive variant. It only doesn't because it was copied from an older wait.c rather than the most recent. [bsegall@google.com: add comment] Link: https://lkml.kernel.org/r/xm26bki0ulsr.fsf_-_@google.com Link: https://lkml.kernel.org/r/xm26pm6hvfer.fsf@google.com Fixes: a16ceb139610 ("epoll: autoremove wakers even more aggressively") Signed-off-by: Ben Segall Cc: Al Viro Cc: Christian Brauner Cc: Signed-off-by: Andrew Morton --- fs/eventpoll.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'fs/eventpoll.c') diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 980483455cc0..266d45c7685b 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -1805,7 +1805,11 @@ static int ep_autoremove_wake_function(struct wait_queue_entry *wq_entry, { int ret = default_wake_function(wq_entry, mode, sync, key); - list_del_init(&wq_entry->entry); + /* + * Pairs with list_empty_careful in ep_poll, and ensures future loop + * iterations see the cause of this wakeup. + */ + list_del_init_careful(&wq_entry->entry); return ret; } -- cgit v1.2.3