Re: bisected regression, v3.5 -> next-20120724: PCI PM causes USB hotplug failure

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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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