[PATCH] PM / core: move device and its children to end of dpm list

[Bjorn Helgaas]

On Wed, Feb 28, 2018 at 10:45:55AM -0800, Feng Kan wrote:
> When bridge and its endpoint is enumated the devices are added to the
> dpm list. Afterward, the bridge defers probe when IOMMU is not ready.
> This causes the bridge to be moved to the end of the dpm list when deferred
> probe kicks in. The order of the dpm list for bridge and endpoint is
> reversed.
> 
> Add reordering code to re-position the bridge and its children so the order
> for suspend and resume is not altered.
> 
> Signed-off-by: Feng Kan <fkan at apm.com>
> Signed-off-by: Toan Le <toanle at apm.com>

> diff --git a/include/linux/device.h b/include/linux/device.h
> index 9d32000..1ec12d5 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -1272,6 +1272,9 @@ extern void devm_device_remove_group(struct device *dev,
>  /* debugging and troubleshooting/diagnostic helpers. */
>  extern const char *dev_driver_string(const struct device *dev);
>  
> +/* reorder device and its children to end of dpm list */
> +void device_pm_reorder(struct device *dev);

Do you expect drivers to use this, or only the driver core in
drivers/base/?  There is a drivers/base/base.h; maybe this would fit
there rather than being exposed to the rest of the kernel via
include/linux/device.h?

>  /* Device links interface. */
>  struct device_link *device_link_add(struct device *consumer,
>  				    struct device *supplier, u32 flags);
> -- 
> 1.8.3.1
> 
> 
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