On Tuesday 04 April 2006 05:20 pm, Russell King wrote:
> On Tue, Apr 04, 2006 at 11:27:06AM +0900, Hyok S. Choi wrote:
> > On Tuesday 04 April 2006 04:44 am, Russell King wrote:
> > > On Mon, Apr 03, 2006 at 08:24:10PM +0900, Hyok S. Choi wrote:
> > >
> > > > +static void dcc_shutdown(struct uart_port *port)
> > > > +{
> > > > +#ifdef DCC_IRQ_USED /* real IRQ used */
> > > > + free_irq(port->irq, port);
> > > > +#else
> > > > + spin_lock(&port->lock);
> > > > + cancel_rearming_delayed_work(&dcc_poll_task);
> > >
> > > cancel_rearming_delayed_work() might sleep due to it calling
> > > flush_workqueue. Therefore, you must not be holding a spinlock.
> >
> > Thus, I've just revised the code to lock around a counter variable
> > operation, which is used for life control of the polling task.
> > I've just posted the revised #3. :-)
>
> Why do you think you need such complexity?
>
> cancel_rearming_delayed_work() will wait until the poll task has
> completed and has been removed from the system. It's explicitly
> designed for work handlers which self-rearm.
Hmm.. Maybe you're right, because dcc_shutdown and dcc_startup, which
are the only functions that initiate or stop the work, will never be
called concurrently by different callers?
--
Hyok
ARM Linux 2.6 MPU/noMMU Project http://opensrc.sec.samsung.com/
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