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authorAl Viro <viro@zeniv.linux.org.uk>2020-10-01 16:10:11 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2020-10-25 20:02:07 -0400
commitd9f41e3c95a17c263bd72799ea8c33ea6138dc22 (patch)
treef44cf8d0831ad7d61d00447523ba5077c7cb89c0
parentb62d2706a754887800a7cec4eb0592a9263a38fc (diff)
epoll: massage the check list insertion
in the "non-epoll target" cases do it in ep_insert() rather than in do_epoll_ctl(), so that we do it only with some epitem is already guaranteed to exist. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/eventpoll.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 06674515132c..8f68095c5ce9 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1375,6 +1375,10 @@ static int ep_insert(struct eventpoll *ep, const struct epoll_event *event,
spin_lock(&tfile->f_lock);
hlist_add_head_rcu(&epi->fllink, &tfile->f_ep_links);
spin_unlock(&tfile->f_lock);
+ if (full_check && !tep) {
+ get_file(tfile);
+ list_add(&tfile->f_tfile_llink, &tfile_check_list);
+ }
/*
* Add the current item to the RB tree. All RB tree operations are
@@ -2013,10 +2017,6 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds,
error = -ELOOP;
if (ep_loop_check(ep, tep) != 0)
goto error_tgt_fput;
- } else {
- get_file(tf.file);
- list_add(&tf.file->f_tfile_llink,
- &tfile_check_list);
}
error = epoll_mutex_lock(&ep->mtx, 0, nonblock);
if (error)