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epoll: ep_autoremove_wake_function should use list_del_init_careful
commit2192bba03d
upstream. 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:a16ceb1396
("epoll: autoremove wakers even more aggressively") Signed-off-by: Ben Segall <bsegall@google.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1753,7 +1753,11 @@ static int ep_autoremove_wake_function(struct wait_queue_entry *wq_entry,
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{
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int ret = default_wake_function(wq_entry, mode, sync, key);
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list_del_init(&wq_entry->entry);
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/*
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* Pairs with list_empty_careful in ep_poll, and ensures future loop
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* iterations see the cause of this wakeup.
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*/
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list_del_init_careful(&wq_entry->entry);
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return ret;
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}
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