On Sun, 6 Jan 2013, Lan Tianyu wrote:
> This patch is to expose usb port's pm qos flags(pm_qos_no_power_off,
> pm_qos_remote_wakeup) to user space. User can set pm_qos_no_power_off
> flag to prohibit the port from being power off.
> @@ -165,8 +166,12 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
> if (retval)
> goto error_register;
>
> - pm_runtime_set_active(&port_dev->dev);
> - pm_runtime_enable(&port_dev->dev);
> + if (!dev_pm_qos_expose_flags(&port_dev->dev,
> + PM_QOS_FLAG_NO_POWER_OFF)) {
> + pm_runtime_set_active(&port_dev->dev);
> + pm_runtime_enable(&port_dev->dev);
> + }
I don't understand this. Why does this code need to be conditional?
Alan Stern
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