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Waiman Long f4f2a1d491 cgroup/cpuset: Wake up cpuset_attach_wq tasks in cpuset_cancel_attach()

commit ba9182a896 upstream.

After a successful cpuset_can_attach() call which increments the
attach_in_progress flag, either cpuset_cancel_attach() or cpuset_attach()
will be called later. In cpuset_attach(), tasks in cpuset_attach_wq,
if present, will be woken up at the end. That is not the case in
cpuset_cancel_attach(). So missed wakeup is possible if the attach
operation is somehow cancelled. Fix that by doing the wakeup in
cpuset_cancel_attach() as well.

Fixes: e44193d39e ("cpuset: let hotplug propagation work wait for task attaching")
Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Cc: stable@vger.kernel.org # v3.11+
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2023-04-20 12:13:55 +02:00

cgroup-internal.h

memcg: fix possible use-after-free in memcg_write_event_control()

2022-12-14 11:37:19 +01:00

cgroup-v1.c

cgroup: Add missing cpus_read_lock() to cgroup_attach_task_all()

2022-09-23 14:15:52 +02:00

cgroup.c

cgroup: Honor caller's cgroup NS when resolving path

2022-10-26 12:35:24 +02:00

cpuset.c

cgroup/cpuset: Wake up cpuset_attach_wq tasks in cpuset_cancel_attach()