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().
Alan Stern
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