schedule_work and speedtch.c

[Roman Kagan]

On Sun, Apr 17, 2005 at 08:15:25PM +0200, Duncan Sands wrote:
> > OK so how about the patch below?  It changes the heavy_init stuff to use
> > a workqueue.  The subdrivers can also use it for status polling, it's a
> > matter of replacing schedule_work() by queue_work() and
> > flush_scheduled_work() by flash_workqueue().
> 
> Actually, I was thinking of one workqueue for the whole of usbatm, not
> one per device.  Isn't one per device overkill?  On the other hand, it
> avoids the problem of multiple devices being initialized serially,
> rather than in parallel.

Exactly that was my reasoning.  The available drivers use timeouts of 2
seconds which is enough for even two instances to stomp on each other
when run off a common workqueue, while per device workqueues don't seem to cost
much.

> Also, with workqueues, we lose the possibility
> of quickly quitting heavy_init on disconnect by sending a signal...

Yes this is an important point I've missed.  I need to think it over...

Cheers,
  Roman.