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由 Tejun Heo 提交于
There are users which want to drain workqueues without destroying it. Separate out drain functionality from destroy_workqueue() into drain_workqueue() and make it accessible to workqueue users. To guarantee forward-progress, only chain queueing is allowed while drain is in progress. If a new work item which isn't chained from the running or pending work items is queued while draining is in progress, WARN_ON_ONCE() is triggered. Signed-off-by: NTejun Heo <tj@kernel.org> Cc: James Bottomley <James.Bottomley@hansenpartnership.com>
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