workqueue: add missing POOL_FREEZING

get_unbound_pool() forgot to set POOL_FREEZING if workqueue_freezing
is set and a new pool could go out of sync with the global freezing
state.

Fix it by adding POOL_FREEZING if workqueue_freezing.  wq_mutex is
already held so no further locking is necessary.  This also removes
the unused static variable warning when !CONFIG_FREEZER.

tj: Updated commit message.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index e38d035bf671348511e50cfc53de0ebef8e6bc5c..40f4017285a0a3dad5abeb14537dad1cd98d5d45 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3503,6 +3503,9 @@ static struct worker_pool *get_unbound_pool(const struct workqueue_attrs *attrs)
        if (!pool || init_worker_pool(pool) < 0)
                goto fail;
 
+       if (workqueue_freezing)
+               pool->flags |= POOL_FREEZING;
+
        lockdep_set_subclass(&pool->lock, 1);   /* see put_pwq() */
        copy_workqueue_attrs(pool->attrs, attrs);