On Sat, Jan 04, 2025 at 11:51:11PM +0800, WangYuli wrote:
> When inserting a USB device, examining hcd->rsrc_start can be
> helpful in identifying which hcd is mounted, as the physical
> address represented here is typically unique.
>
> The following code snippet demonstrates this:
> struct usb_hcd *hcd = bus_to_hcd(udev->bus);
> unsigned long long usb_hcd_addr = (unsigned long long)hcd->rsrc_start;
>
> However, this approach has limitations now. For USB hosts with an
> MMIO interface, the effectiveness of this method is restricted to
> USB 2.0.
>
> Becase commit 3429e91a661e ("usb: host: xhci: add platform driver
> support") assigned res->start to hcd->rsrc_start. But
> shared_hcd->rsrc_start remains unassigned, which is also necessary
> in certain scenarios.
>
> Co-developed-by: Xu Rao <raoxu@xxxxxxxxxxxxx>
> Signed-off-by: Xu Rao <raoxu@xxxxxxxxxxxxx>
> Signed-off-by: WangYuli <wangyuli@xxxxxxxxxxxxx>
> --
> Changlog:
> v1 -> v2: Move code changes for commit e0fe986972f5 ("usb: host:
> xhci-plat: prepare operation w/o shared hcd").
> ---
What commit id does this fix?
thanks,
greg k-h
