On Friday, July 27, 2012, Alan Stern wrote:
> On Fri, 27 Jul 2012, Huang Ying wrote:
>
> > --- a/drivers/pci/pci-driver.c
> > +++ b/drivers/pci/pci-driver.c
> > @@ -280,8 +280,12 @@ static long local_pci_probe(void *_ddi)
> > {
> > struct drv_dev_and_id *ddi = _ddi;
> > struct device *dev = &ddi->dev->dev;
> > + struct device *parent = dev->parent;
> > int rc;
> >
> > + /* The parent bridge must be in active state when probing */
> > + if (parent)
> > + pm_runtime_get_sync(parent);
>
> Ooh, this is a very good point. I completely missed it.
>
> > /* Unbound PCI devices are always set to disabled and suspended.
> > * During probe, the device is set to enabled and active and the
> > * usage count is incremented. If the driver supports runtime PM,
> > @@ -298,6 +302,8 @@ static long local_pci_probe(void *_ddi)
> > pm_runtime_set_suspended(dev);
> > pm_runtime_put_noidle(dev);
> > }
> > + if (parent)
> > + pm_runtime_put(parent);
>
> You should use pm_runtime_put_sync(), not pm_runtime_put().
Hmm, why exactly?
Rafael
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