USB: core: use kernel assigned address for devices under xHCI

xHCI driver uses hardware assigned device address. This may cause device
address conflict in certain cases.

Use kernel assigned address for devices under xHCI. Store the xHC assigned
address locally in xHCI driver.
Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

drivers/usb/core/hub.c

@@ -2594,16 +2594,14 @@ static int hub_set_address(struct usb_device *udev, int devnum)
 		return 0;
 	if (udev->state != USB_STATE_DEFAULT)
 		return -EINVAL;
-	if (hcd->driver->address_device) {
+	if (hcd->driver->address_device)
 		retval = hcd->driver->address_device(hcd, udev);
-	} else {
+	else
 		retval = usb_control_msg(udev, usb_sndaddr0pipe(),
 				USB_REQ_SET_ADDRESS, 0, devnum, 0,
 				NULL, 0, USB_CTRL_SET_TIMEOUT);
-		if (retval == 0)
-			update_address(udev, devnum);
-	}
 	if (retval == 0) {
+		update_address(udev, devnum);
 		/* Device now using proper address. */
 		usb_set_device_state(udev, USB_STATE_ADDRESS);
 		usb_ep0_reinit(udev);
@@ -3097,16 +3095,17 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
 			udev->speed = USB_SPEED_UNKNOWN;
 
 		/*
-		 * xHCI needs to issue an address device command later
-		 * in the hub_port_init sequence for SS/HS/FS/LS devices.
+		 * Set the address.
+		 * Note xHCI needs to issue an address device command later
+		 * in the hub_port_init sequence for SS/HS/FS/LS devices,
+		 * and xHC will assign an address to the device. But use
+		 * kernel assigned address here, to avoid any address conflict
+		 * issue.
 		 */
-		if (!(hcd->driver->flags & HCD_USB3)) {
-			/* set the address */
-			choose_address(udev);
-			if (udev->devnum <= 0) {
-				status = -ENOTCONN;	/* Don't retry */
-				goto loop;
-			}
+		choose_address(udev);
+		if (udev->devnum <= 0) {
+			status = -ENOTCONN;	/* Don't retry */
+			goto loop;
 		}
 
 		/* reset (non-USB 3.0 devices) and get descriptor */

drivers/usb/host/xhci.c

@@ -2287,15 +2287,15 @@ int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
 	 * address given back to us by the HC.
 	 */
 	slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
-	udev->devnum = (slot_ctx->dev_state & DEV_ADDR_MASK) + 1;
+	/* Use kernel assigned address for devices; store xHC assigned
+	 * address locally. */
+	virt_dev->address = (slot_ctx->dev_state & DEV_ADDR_MASK) + 1;
 	/* Zero the input context control for later use */
 	ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
 	ctrl_ctx->add_flags = 0;
 	ctrl_ctx->drop_flags = 0;
 
-	xhci_dbg(xhci, "Device address = %d\n", udev->devnum);
-	/* XXX Meh, not sure if anyone else but choose_address uses this. */
-	set_bit(udev->devnum, udev->bus->devmap.devicemap);
+	xhci_dbg(xhci, "Internal device address = %d\n", virt_dev->address);
 
 	return 0;
 }

drivers/usb/host/xhci.h

@@ -746,6 +746,8 @@ struct xhci_virt_device {
 	/* Rings saved to ensure old alt settings can be re-instated */
 	struct xhci_ring		**ring_cache;
 	int				num_rings_cached;
+	/* Store xHC assigned device address */
+	int				address;
 #define	XHCI_MAX_RINGS_CACHED	31
 	struct xhci_virt_ep		eps[31];
 	struct completion		cmd_completion;