usb: host: xhci-plat: Assign shared_hcd->rsrc_start

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.

Because 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.

Fixes: 3429e91a661e ("usb: host: xhci: add platform driver support")
Co-developed-by: Xu Rao <raoxu@uniontech.com>
Signed-off-by: Xu Rao <raoxu@uniontech.com>
Signed-off-by: WangYuli <wangyuli@uniontech.com>
Link: https://lore.kernel.org/r/186B9F56972457B4+20250107133854.172309-1-wangyuli@uniontech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index e6c9006bd5685fd5b9eccf697b4dd048fd6b37ed..457e839b9b53e9a148bc0d110705c90bf822e3be 100644 (file)
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -329,6 +329,8 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
                usb3_hcd->can_do_streams = 1;
 
        if (xhci->shared_hcd) {
+               xhci->shared_hcd->rsrc_start = hcd->rsrc_start;
+               xhci->shared_hcd->rsrc_len = hcd->rsrc_len;
                ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
                if (ret)
                        goto put_usb3_hcd;