workqueue destruction BUG_ON

[Johannes Berg]

Tejun, all,

In our testing with iwlwifi, we keep running into this BUG_ON:

	BUG_ON(cwq->nr_active);

in destroy_workqueue(). This is quite unhelpful, and since the code
flushes the workqueue I really don't see how this could be happening,
unless maybe there's cross-talk between this and other workqueues?

johannes

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