On Tuesday, February 08, 2011, Dmitry Torokhov wrote:
> On Tue, Feb 08, 2011 at 12:29:57AM +0100, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rjw@xxxxxxx>
> >
> > If thermal polling is enabled, which for example is the case for
> > ACPI thermal zones with the _TZP object defined, the thermal driver
> > uses delayed work items for this purpose. Unfortunately, since
> > they are queued up using schedule_delayed_work(), the work function
> > may be executed during system suspend or resume, which is not
> > desirable.
> >
> > To prevent that from happening, use a freezable workqueue for
> > queuing up delayed work items in the thermal driver.
> >
> > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
> > ---
> > drivers/thermal/thermal_sys.c | 22 ++++++++++++++++++++--
> > 1 file changed, 20 insertions(+), 2 deletions(-)
> >
> > Index: linux-2.6/drivers/thermal/thermal_sys.c
> > ===================================================================
> > --- linux-2.6.orig/drivers/thermal/thermal_sys.c
> > +++ linux-2.6/drivers/thermal/thermal_sys.c
> > @@ -62,6 +62,20 @@ static DEFINE_MUTEX(thermal_list_lock);
> >
> > static unsigned int thermal_event_seqnum;
> >
> > +static struct workqueue_struct *thermal_wq;
> > +
> > +static int __init thermal_start_workqueue(void)
> > +{
> > + thermal_wq = alloc_workqueue("thermal", WQ_FREEZEABLE, 0);
>
> Should probably be unbound as well.
Yup, thanks.
> FWIW, I would not mind if we had a global freezeable workqueue already
> predefined. I could switch input_polldev and vmw_balloon to it and there
> probably could be more users...
Hmm, OK.
Do you think we should add system_freezeable_wq to the set of predefined
workqueues?
Rafael
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