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| author | Waiman Long <longman@redhat.com> | 2023-04-11 15:35:57 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2023-04-12 20:23:58 +0200 |
| commit | ba9182a89626d5f83c2ee4594f55cb9c1e60f0e2 (patch) | |
| tree | c932a0a2c3b593f3f4d6ffd90bcffbb6dad9cdc9 /kernel | |
| parent | cgroup,freezer: hold cpu_hotplug_lock before freezer_mutex (diff) | |
| download | linux-ba9182a89626d5f83c2ee4594f55cb9c1e60f0e2.tar.xz linux-ba9182a89626d5f83c2ee4594f55cb9c1e60f0e2.zip | |
cgroup/cpuset: Wake up cpuset_attach_wq tasks in cpuset_cancel_attach()
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: e44193d39e8d ("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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup/cpuset.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index f310915d1257..ff7eb8e2efdc 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -2502,11 +2502,15 @@ out_unlock: static void cpuset_cancel_attach(struct cgroup_taskset *tset) { struct cgroup_subsys_state *css; + struct cpuset *cs; cgroup_taskset_first(tset, &css); + cs = css_cs(css); percpu_down_write(&cpuset_rwsem); - css_cs(css)->attach_in_progress--; + cs->attach_in_progress--; + if (!cs->attach_in_progress) + wake_up(&cpuset_attach_wq); percpu_up_write(&cpuset_rwsem); } |