[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>

6 files changed, 4 insertions, 135 deletions

diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index 9d37fc771b27..1918d10f7569 100644
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/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)
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index bc69bd7acebe..527abc693b17 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/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 @@ done2:
                 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)
diff --git a/drivers/usb/host/isp116x-hcd.c b/drivers/usb/host/isp116x-hcd.c
index 1183988fdf54..ff0a168e8eed 100644
--- a/drivers/usb/host/isp116x-hcd.c
+++ b/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)
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 0da996191251..13cd2177b557 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/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 @@ retry:
 
         // 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;
 }
 
diff --git a/drivers/usb/host/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c
index 1f2d00fe983a..6c3f910bc307 100644
--- a/drivers/usb/host/sl811-hcd.c
+++ b/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);
 
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 6b87bd74b046..fdf54295da73 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/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 @@ err_alloc_skelqh:
         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;