On Mon, 13 Aug 2012, Lan, Tianyu wrote:

> Hi all:
>               I am trying to implement patch of setting DeviceRemovable 
> according ACPI information.
> The DeviceRemovable is set in hcd driver *_hub_descriptor(e.g 
> ehci_hub_descriptor()). But these
> functions just have struct usb_hcd or hcd specific struct(e.g struct 
> xhci_hcd) and struct usb_hub_descriptor
> point as parameter. There is no way to get the root hub's struct usb_device 
> which can be used to find
> ports'device and then get ports' acpi handle and information. A bridge 
> between usb_hcd and root hub's 
> usb_device is needed. I have a proposal of add root hub's struct usb_device 
> point into the struct usb_hcd.
> Does this make sense or is there other solutions? Thanks.

hcd->bus.root_hub.

Alan Stern

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