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>

1 files changed, 0 insertions, 6 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 29c77a714731..c7fe303b5109 100644
--- 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