workqueue is not working?

I tried to schedule some work in an softirq handler. The way I did is
as follows:

I use create_workqueue to initialize a workqueue "vrpciod_workqueue",

in the softirq, I do INIT_WORK(work, func, data), and then
queue_work(vrpciod_workqueue, work);

I think func() should be called a bit later. However, I noticed that
func() is never called by the workqueue. I don't know why.

Can soneone give me some suggestions? Many thanks!

Xin
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