cgroup: remove useless code in cgroup_write_event_control()

eventfd_poll() never returns POLLHUP.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 29c77a7..c7fe303 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3937,12 +3937,6 @@ static int cgroup_write_event_control(struct cgroup *cgrp, struct cftype *cft,
        if (ret)
                goto fail;
 
-       if (efile->f_op->poll(efile, &event->pt) & POLLHUP) {
-               event->cft->unregister_event(cgrp, event->cft, event->eventfd);
-               ret = 0;
-               goto fail;
-       }
-
        /*
         * Events should be removed after rmdir of cgroup directory, but before
         * destroying subsystem state objects. Let's take reference to cgroup