[PATCH] USB HCDs: no longer need to register root hub

This patch changes the host controller drivers; they no longer need to
register their root hubs because usbcore will take care of it for them.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/dummy_hcd.c

@@ -1625,7 +1625,6 @@ static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
 static int dummy_start (struct usb_hcd *hcd)
 {
 	struct dummy		*dum;
-	struct usb_device	*root;
 	int			retval;
 
 	dum = hcd_to_dummy (hcd);
@@ -1642,35 +1641,16 @@ static int dummy_start (struct usb_hcd *hcd)
 
 	INIT_LIST_HEAD (&dum->urbp_list);
 
-	root = usb_alloc_dev (NULL, &hcd->self, 0);
-	if (!root)
-		return -ENOMEM;
+	if ((retval = dummy_register_udc (dum)) != 0)
+		return retval;
 
 	/* only show a low-power port: just 8mA */
 	hcd->power_budget = 8;
-
-	/* root hub enters addressed state... */
 	hcd->state = HC_STATE_RUNNING;
-	root->speed = USB_SPEED_HIGH;
-
-	/* ...then configured, so khubd sees us. */
-	if ((retval = usb_hcd_register_root_hub (root, hcd)) != 0) {
-		goto err1;
-	}
-
-	if ((retval = dummy_register_udc (dum)) != 0)
-		goto err2;
 
 	/* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
 	device_create_file (dummy_dev(dum), &dev_attr_urbs);
 	return 0;
-
- err2:
-	usb_disconnect (&hcd->self.root_hub);
- err1:
-	usb_put_dev (root);
-	hcd->state = HC_STATE_QUIESCING;
-	return retval;
 }
 
 static void dummy_stop (struct usb_hcd *hcd)

drivers/usb/host/ehci-hcd.c

@@ -492,8 +492,6 @@ static int ehci_start (struct usb_hcd *hcd)
 {
 	struct ehci_hcd		*ehci = hcd_to_ehci (hcd);
 	u32			temp;
-	struct usb_device	*udev;
-	struct usb_bus		*bus;
 	int			retval;
 	u32			hcc_params;
 	u8                      sbrn = 0;
@@ -631,17 +629,6 @@ static int ehci_start (struct usb_hcd *hcd)
 
 	/* set async sleep time = 10 us ... ? */
 
-	/* wire up the root hub */
-	bus = hcd_to_bus (hcd);
-	udev = first ? usb_alloc_dev (NULL, bus, 0) : bus->root_hub;
-	if (!udev) {
-done2:
-		ehci_mem_cleanup (ehci);
-		return -ENOMEM;
-	}
-	udev->speed = USB_SPEED_HIGH;
-	udev->state = first ? USB_STATE_ATTACHED : USB_STATE_CONFIGURED;
-
 	/*
 	 * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
 	 * are explicitly handed to companion controller(s), so no TT is
@@ -664,24 +651,6 @@ static int ehci_start (struct usb_hcd *hcd)
 		first ? "initialized" : "restarted",
 		temp >> 8, temp & 0xff, DRIVER_VERSION);
 
-	/*
-	 * From here on, khubd concurrently accesses the root
-	 * hub; drivers will be talking to enumerated devices.
-	 * (On restart paths, khubd already knows about the root
-	 * hub and could find work as soon as we wrote FLAG_CF.)
-	 *
-	 * Before this point the HC was idle/ready.  After, khubd
-	 * and device drivers may start it running.
-	 */
-	if (first && usb_hcd_register_root_hub (udev, hcd) != 0) {
-		if (hcd->state == HC_STATE_RUNNING)
-			ehci_quiesce (ehci);
-		ehci_reset (ehci);
-		usb_put_dev (udev); 
-		retval = -ENODEV;
-		goto done2;
-	}
-
 	writel (INTR_MASK, &ehci->regs->intr_enable); /* Turn On Interrupts */
 
 	if (first)

drivers/usb/host/isp116x-hcd.c

@@ -1547,7 +1547,6 @@ static int isp116x_start(struct usb_hcd *hcd)
 {
 	struct isp116x *isp116x = hcd_to_isp116x(hcd);
 	struct isp116x_platform_data *board = isp116x->board;
-	struct usb_device *udev;
 	u32 val;
 	unsigned long flags;
 
@@ -1609,24 +1608,9 @@ static int isp116x_start(struct usb_hcd *hcd)
 	isp116x->rhstatus = isp116x_read_reg32(isp116x, HCRHSTATUS);
 
 	isp116x_write_reg32(isp116x, HCFMINTVL, 0x27782edf);
-	spin_unlock_irqrestore(&isp116x->lock, flags);
-
-	udev = usb_alloc_dev(NULL, &hcd->self, 0);
-	if (!udev) {
-		isp116x_stop(hcd);
-		return -ENOMEM;
-	}
 
-	udev->speed = USB_SPEED_FULL;
 	hcd->state = HC_STATE_RUNNING;
 
-	if (usb_hcd_register_root_hub(udev, hcd) != 0) {
-		isp116x_stop(hcd);
-		usb_put_dev(udev);
-		return -ENODEV;
-	}
-
-	spin_lock_irqsave(&isp116x->lock, flags);
 	/* Set up interrupts */
 	isp116x->intenb = HCINT_MIE | HCINT_RHSC | HCINT_UE;
 	if (board->remote_wakeup_enable)

drivers/usb/host/ohci-hcd.c

@@ -505,13 +505,10 @@ static int ohci_init (struct ohci_hcd *ohci)
 /* Start an OHCI controller, set the BUS operational
  * resets USB and controller
  * enable interrupts 
- * connect the virtual root hub
  */
 static int ohci_run (struct ohci_hcd *ohci)
 {
   	u32			mask, temp;
-  	struct usb_device	*udev;
-  	struct usb_bus		*bus;
 	int			first = ohci->fminterval == 0;
 
 	disable (ohci);
@@ -672,36 +669,13 @@ static int ohci_run (struct ohci_hcd *ohci)
 
 	// POTPGT delay is bits 24-31, in 2 ms units.
 	mdelay ((temp >> 23) & 0x1fe);
-	bus = &ohci_to_hcd(ohci)->self;
 	ohci_to_hcd(ohci)->state = HC_STATE_RUNNING;
 
 	ohci_dump (ohci, 1);
 
-	udev = bus->root_hub;
-	if (udev) {
-		return 0;
-	}
- 
-	/* connect the virtual root hub */
-	udev = usb_alloc_dev (NULL, bus, 0);
-	if (!udev) {
-		disable (ohci);
-		ohci->hc_control &= ~OHCI_CTRL_HCFS;
-		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
-		return -ENOMEM;
-	}
-
-	udev->speed = USB_SPEED_FULL;
-	if (usb_hcd_register_root_hub (udev, ohci_to_hcd(ohci)) != 0) {
-		usb_put_dev (udev);
-		disable (ohci);
-		ohci->hc_control &= ~OHCI_CTRL_HCFS;
-		ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
-		return -ENODEV;
-	}
+	if (ohci_to_hcd(ohci)->self.root_hub == NULL)
+		create_debug_files (ohci);
 
-	register_reboot_notifier (&ohci->reboot_notifier);
-	create_debug_files (ohci);
 	return 0;
 }
 

drivers/usb/host/sl811-hcd.c

@@ -1563,15 +1563,8 @@ static int
 sl811h_start(struct usb_hcd *hcd)
 {
 	struct sl811		*sl811 = hcd_to_sl811(hcd);
-	struct usb_device	*udev;
 
 	/* chip has been reset, VBUS power is off */
-
-	udev = usb_alloc_dev(NULL, &hcd->self, 0);
-	if (!udev)
-		return -ENOMEM;
-
-	udev->speed = USB_SPEED_FULL;
 	hcd->state = HC_STATE_RUNNING;
 
 	if (sl811->board) {
@@ -1579,12 +1572,6 @@ sl811h_start(struct usb_hcd *hcd)
 		hcd->power_budget = sl811->board->power * 2;
 	}
 
-	if (usb_hcd_register_root_hub(udev, hcd) != 0) {
-		usb_put_dev(udev);
-		sl811h_stop(hcd);
-		return -ENODEV;
-	}
-
 	/* enable power and interupts */
 	port_power(sl811, 1);
 

drivers/usb/host/uhci-hcd.c

@@ -562,7 +562,6 @@ static int uhci_start(struct usb_hcd *hcd)
 	int retval = -EBUSY;
 	int i;
 	dma_addr_t dma_handle;
-	struct usb_device *udev;
 	struct dentry *dentry;
 
 	hcd->uses_new_polling = 1;
@@ -626,14 +625,6 @@ static int uhci_start(struct usb_hcd *hcd)
 		goto err_create_qh_pool;
 	}
 
-	/* Initialize the root hub */
-
-	udev = usb_alloc_dev(NULL, &hcd->self, 0);
-	if (!udev) {
-		dev_err(uhci_dev(uhci), "unable to allocate root hub\n");
-		goto err_alloc_root_hub;
-	}
-
 	uhci->term_td = uhci_alloc_td(uhci);
 	if (!uhci->term_td) {
 		dev_err(uhci_dev(uhci), "unable to allocate terminating TD\n");
@@ -713,24 +704,11 @@ static int uhci_start(struct usb_hcd *hcd)
 
 	configure_hc(uhci);
 	start_rh(uhci);
-
-	udev->speed = USB_SPEED_FULL;
-
-	if (usb_hcd_register_root_hub(udev, hcd) != 0) {
-		dev_err(uhci_dev(uhci), "unable to start root hub\n");
-		retval = -ENOMEM;
-		goto err_start_root_hub;
-	}
-
 	return 0;
 
 /*
  * error exits:
  */
-err_start_root_hub:
-	reset_hc(uhci);
-	del_timer_sync(&uhci->stall_timer);
-
 err_alloc_skelqh:
 	for (i = 0; i < UHCI_NUM_SKELQH; i++)
 		if (uhci->skelqh[i]) {
@@ -742,9 +720,6 @@ static int uhci_start(struct usb_hcd *hcd)
 	uhci->term_td = NULL;
 
 err_alloc_term_td:
-	usb_put_dev(udev);
-
-err_alloc_root_hub:
 	dma_pool_destroy(uhci->qh_pool);
 	uhci->qh_pool = NULL;