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

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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>

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Waiman Long 2023-04-11 09:35:57 -04:00 • committed by Tejun Heo

parent 57dcd64c7e

commit ba9182a896

1 changed files with 5 additions and 1 deletions

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kernel/cgroup/cpuset.c

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