Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1539 insertions, 0 deletions

diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
new file mode 100644
index 000000000000..2a7c19501f24
--- /dev/null
+++ b/drivers/usb/host/uhci-q.c
@@ -0,0 +1,1539 @@
+/*
+ * Universal Host Controller Interface driver for USB.
+ *
+ * Maintainer: Alan Stern <stern@rowland.harvard.edu>
+ *
+ * (C) Copyright 1999 Linus Torvalds
+ * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
+ * (C) Copyright 1999 Randy Dunlap
+ * (C) Copyright 1999 Georg Acher, acher@in.tum.de
+ * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
+ * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
+ * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
+ * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
+ *               support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
+ * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
+ * (C) Copyright 2004 Alan Stern, stern@rowland.harvard.edu
+ */
+
+static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb);
+static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb);
+static void uhci_remove_pending_urbps(struct uhci_hcd *uhci);
+static void uhci_free_pending_qhs(struct uhci_hcd *uhci);
+static void uhci_free_pending_tds(struct uhci_hcd *uhci);
+
+/*
+ * Technically, updating td->status here is a race, but it's not really a
+ * problem. The worst that can happen is that we set the IOC bit again
+ * generating a spurious interrupt. We could fix this by creating another
+ * QH and leaving the IOC bit always set, but then we would have to play
+ * games with the FSBR code to make sure we get the correct order in all
+ * the cases. I don't think it's worth the effort
+ */
+static inline void uhci_set_next_interrupt(struct uhci_hcd *uhci)
+{
+        uhci->term_td->status |= cpu_to_le32(TD_CTRL_IOC); 
+}
+
+static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci)
+{
+        uhci->term_td->status &= ~cpu_to_le32(TD_CTRL_IOC);
+}
+
+static inline void uhci_moveto_complete(struct uhci_hcd *uhci, 
+                                        struct urb_priv *urbp)
+{
+        list_move_tail(&urbp->urb_list, &uhci->complete_list);
+}
+
+static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci, struct usb_device *dev)
+{
+        dma_addr_t dma_handle;
+        struct uhci_td *td;
+
+        td = dma_pool_alloc(uhci->td_pool, GFP_ATOMIC, &dma_handle);
+        if (!td)
+                return NULL;
+
+        td->dma_handle = dma_handle;
+
+        td->link = UHCI_PTR_TERM;
+        td->buffer = 0;
+
+        td->frame = -1;
+        td->dev = dev;
+
+        INIT_LIST_HEAD(&td->list);
+        INIT_LIST_HEAD(&td->remove_list);
+        INIT_LIST_HEAD(&td->fl_list);
+
+        usb_get_dev(dev);
+
+        return td;
+}
+
+static inline void uhci_fill_td(struct uhci_td *td, u32 status,
+                u32 token, u32 buffer)
+{
+        td->status = cpu_to_le32(status);
+        td->token = cpu_to_le32(token);
+        td->buffer = cpu_to_le32(buffer);
+}
+
+/*
+ * We insert Isochronous URB's directly into the frame list at the beginning
+ */
+static void uhci_insert_td_frame_list(struct uhci_hcd *uhci, struct uhci_td *td, unsigned framenum)
+{
+        framenum &= (UHCI_NUMFRAMES - 1);
+
+        td->frame = framenum;
+
+        /* Is there a TD already mapped there? */
+        if (uhci->fl->frame_cpu[framenum]) {
+                struct uhci_td *ftd, *ltd;
+
+                ftd = uhci->fl->frame_cpu[framenum];
+                ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);
+
+                list_add_tail(&td->fl_list, &ftd->fl_list);
+
+                td->link = ltd->link;
+                wmb();
+                ltd->link = cpu_to_le32(td->dma_handle);
+        } else {
+                td->link = uhci->fl->frame[framenum];
+                wmb();
+                uhci->fl->frame[framenum] = cpu_to_le32(td->dma_handle);
+                uhci->fl->frame_cpu[framenum] = td;
+        }
+}
+
+static void uhci_remove_td(struct uhci_hcd *uhci, struct uhci_td *td)
+{
+        /* If it's not inserted, don't remove it */
+        if (td->frame == -1 && list_empty(&td->fl_list))
+                return;
+
+        if (td->frame != -1 && uhci->fl->frame_cpu[td->frame] == td) {
+                if (list_empty(&td->fl_list)) {
+                        uhci->fl->frame[td->frame] = td->link;
+                        uhci->fl->frame_cpu[td->frame] = NULL;
+                } else {
+                        struct uhci_td *ntd;
+
+                        ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list);
+                        uhci->fl->frame[td->frame] = cpu_to_le32(ntd->dma_handle);
+                        uhci->fl->frame_cpu[td->frame] = ntd;
+                }
+        } else {
+                struct uhci_td *ptd;
+
+                ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list);
+                ptd->link = td->link;
+        }
+
+        wmb();
+        td->link = UHCI_PTR_TERM;
+
+        list_del_init(&td->fl_list);
+        td->frame = -1;
+}
+
+/*
+ * Inserts a td list into qh.
+ */
+static void uhci_insert_tds_in_qh(struct uhci_qh *qh, struct urb *urb, __le32 breadth)
+{
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+        struct uhci_td *td;
+        __le32 *plink;
+
+        /* Ordering isn't important here yet since the QH hasn't been */
+        /* inserted into the schedule yet */
+        plink = &qh->element;
+        list_for_each_entry(td, &urbp->td_list, list) {
+                *plink = cpu_to_le32(td->dma_handle) | breadth;
+                plink = &td->link;
+        }
+        *plink = UHCI_PTR_TERM;
+}
+
+static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
+{
+        if (!list_empty(&td->list))
+                dev_warn(uhci_dev(uhci), "td %p still in list!\n", td);
+        if (!list_empty(&td->remove_list))
+                dev_warn(uhci_dev(uhci), "td %p still in remove_list!\n", td);
+        if (!list_empty(&td->fl_list))
+                dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td);
+
+        if (td->dev)
+                usb_put_dev(td->dev);
+
+        dma_pool_free(uhci->td_pool, td, td->dma_handle);
+}
+
+static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci, struct usb_device *dev)
+{
+        dma_addr_t dma_handle;
+        struct uhci_qh *qh;
+
+        qh = dma_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle);
+        if (!qh)
+                return NULL;
+
+        qh->dma_handle = dma_handle;
+
+        qh->element = UHCI_PTR_TERM;
+        qh->link = UHCI_PTR_TERM;
+
+        qh->dev = dev;
+        qh->urbp = NULL;
+
+        INIT_LIST_HEAD(&qh->list);
+        INIT_LIST_HEAD(&qh->remove_list);
+
+        usb_get_dev(dev);
+
+        return qh;
+}
+
+static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
+{
+        if (!list_empty(&qh->list))
+                dev_warn(uhci_dev(uhci), "qh %p list not empty!\n", qh);
+        if (!list_empty(&qh->remove_list))
+                dev_warn(uhci_dev(uhci), "qh %p still in remove_list!\n", qh);
+
+        if (qh->dev)
+                usb_put_dev(qh->dev);
+
+        dma_pool_free(uhci->qh_pool, qh, qh->dma_handle);
+}
+
+/*
+ * Append this urb's qh after the last qh in skelqh->list
+ *
+ * Note that urb_priv.queue_list doesn't have a separate queue head;
+ * it's a ring with every element "live".
+ */
+static void uhci_insert_qh(struct uhci_hcd *uhci, struct uhci_qh *skelqh, struct urb *urb)
+{
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+        struct urb_priv *turbp;
+        struct uhci_qh *lqh;
+
+        /* Grab the last QH */
+        lqh = list_entry(skelqh->list.prev, struct uhci_qh, list);
+
+        /* Point to the next skelqh */
+        urbp->qh->link = lqh->link;
+        wmb();                          /* Ordering is important */
+
+        /*
+         * Patch QHs for previous endpoint's queued URBs?  HC goes
+         * here next, not to the next skelqh it now points to.
+         *
+         *    lqh --> td ... --> qh ... --> td --> qh ... --> td
+         *     |                 |                 |
+         *     v                 v                 v
+         *     +<----------------+-----------------+
+         *     v
+         *    newqh --> td ... --> td
+         *     |
+         *     v
+         *    ...
+         *
+         * The HC could see (and use!) any of these as we write them.
+         */
+        lqh->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
+        if (lqh->urbp) {
+                list_for_each_entry(turbp, &lqh->urbp->queue_list, queue_list)
+                        turbp->qh->link = lqh->link;
+        }
+
+        list_add_tail(&urbp->qh->list, &skelqh->list);
+}
+
+/*
+ * Start removal of QH from schedule; it finishes next frame.
+ * TDs should be unlinked before this is called.
+ */
+static void uhci_remove_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
+{
+        struct uhci_qh *pqh;
+        __le32 newlink;
+
+        if (!qh)
+                return;
+
+        /*
+         * Only go through the hoops if it's actually linked in
+         */
+        if (!list_empty(&qh->list)) {
+
+                /* If our queue is nonempty, make the next URB the head */
+                if (!list_empty(&qh->urbp->queue_list)) {
+                        struct urb_priv *nurbp;
+
+                        nurbp = list_entry(qh->urbp->queue_list.next,
+                                        struct urb_priv, queue_list);
+                        nurbp->queued = 0;
+                        list_add(&nurbp->qh->list, &qh->list);
+                        newlink = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
+                } else
+                        newlink = qh->link;
+
+                /* Fix up the previous QH's queue to link to either
+                 * the new head of this queue or the start of the
+                 * next endpoint's queue. */
+                pqh = list_entry(qh->list.prev, struct uhci_qh, list);
+                pqh->link = newlink;
+                if (pqh->urbp) {
+                        struct urb_priv *turbp;
+
+                        list_for_each_entry(turbp, &pqh->urbp->queue_list,
+                                        queue_list)
+                                turbp->qh->link = newlink;
+                }
+                wmb();
+
+                /* Leave qh->link in case the HC is on the QH now, it will */
+                /* continue the rest of the schedule */
+                qh->element = UHCI_PTR_TERM;
+
+                list_del_init(&qh->list);
+        }
+
+        list_del_init(&qh->urbp->queue_list);
+        qh->urbp = NULL;
+
+        uhci_get_current_frame_number(uhci);
+        if (uhci->frame_number + uhci->is_stopped != uhci->qh_remove_age) {
+                uhci_free_pending_qhs(uhci);
+                uhci->qh_remove_age = uhci->frame_number;
+        }
+
+        /* Check to see if the remove list is empty. Set the IOC bit */
+        /* to force an interrupt so we can remove the QH */
+        if (list_empty(&uhci->qh_remove_list))
+                uhci_set_next_interrupt(uhci);
+
+        list_add(&qh->remove_list, &uhci->qh_remove_list);
+}
+
+static int uhci_fixup_toggle(struct urb *urb, unsigned int toggle)
+{
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+        struct uhci_td *td;
+
+        list_for_each_entry(td, &urbp->td_list, list) {
+                if (toggle)
+                        td->token |= cpu_to_le32(TD_TOKEN_TOGGLE);
+                else
+                        td->token &= ~cpu_to_le32(TD_TOKEN_TOGGLE);
+
+                toggle ^= 1;
+        }
+
+        return toggle;
+}
+
+/* This function will append one URB's QH to another URB's QH. This is for */
+/* queuing interrupt, control or bulk transfers */
+static void uhci_append_queued_urb(struct uhci_hcd *uhci, struct urb *eurb, struct urb *urb)
+{
+        struct urb_priv *eurbp, *urbp, *furbp, *lurbp;
+        struct uhci_td *lltd;
+
+        eurbp = eurb->hcpriv;
+        urbp = urb->hcpriv;
+
+        /* Find the first URB in the queue */
+        furbp = eurbp;
+        if (eurbp->queued) {
+                list_for_each_entry(furbp, &eurbp->queue_list, queue_list)
+                        if (!furbp->queued)
+                                break;
+        }
+
+        lurbp = list_entry(furbp->queue_list.prev, struct urb_priv, queue_list);
+
+        lltd = list_entry(lurbp->td_list.prev, struct uhci_td, list);
+
+        /* Control transfers always start with toggle 0 */
+        if (!usb_pipecontrol(urb->pipe))
+                usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+                                usb_pipeout(urb->pipe),
+                                uhci_fixup_toggle(urb,
+                                        uhci_toggle(td_token(lltd)) ^ 1));
+
+        /* All qh's in the queue need to link to the next queue */
+        urbp->qh->link = eurbp->qh->link;
+
+        wmb();                  /* Make sure we flush everything */
+
+        lltd->link = cpu_to_le32(urbp->qh->dma_handle) | UHCI_PTR_QH;
+
+        list_add_tail(&urbp->queue_list, &furbp->queue_list);
+
+        urbp->queued = 1;
+}
+
+static void uhci_delete_queued_urb(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct urb_priv *urbp, *nurbp, *purbp, *turbp;
+        struct uhci_td *pltd;
+        unsigned int toggle;
+
+        urbp = urb->hcpriv;
+
+        if (list_empty(&urbp->queue_list))
+                return;
+
+        nurbp = list_entry(urbp->queue_list.next, struct urb_priv, queue_list);
+
+        /*
+         * Fix up the toggle for the following URBs in the queue.
+         * Only needed for bulk and interrupt: control and isochronous
+         * endpoints don't propagate toggles between messages.
+         */
+        if (usb_pipebulk(urb->pipe) || usb_pipeint(urb->pipe)) {
+                if (!urbp->queued)
+                        /* We just set the toggle in uhci_unlink_generic */
+                        toggle = usb_gettoggle(urb->dev,
+                                        usb_pipeendpoint(urb->pipe),
+                                        usb_pipeout(urb->pipe));
+                else {
+                        /* If we're in the middle of the queue, grab the */
+                        /* toggle from the TD previous to us */
+                        purbp = list_entry(urbp->queue_list.prev,
+                                        struct urb_priv, queue_list);
+                        pltd = list_entry(purbp->td_list.prev,
+                                        struct uhci_td, list);
+                        toggle = uhci_toggle(td_token(pltd)) ^ 1;
+                }
+
+                list_for_each_entry(turbp, &urbp->queue_list, queue_list) {
+                        if (!turbp->queued)
+                                break;
+                        toggle = uhci_fixup_toggle(turbp->urb, toggle);
+                }
+
+                usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+                                usb_pipeout(urb->pipe), toggle);
+        }
+
+        if (urbp->queued) {
+                /* We're somewhere in the middle (or end).  The case where
+                 * we're at the head is handled in uhci_remove_qh(). */
+                purbp = list_entry(urbp->queue_list.prev, struct urb_priv,
+                                queue_list);
+
+                pltd = list_entry(purbp->td_list.prev, struct uhci_td, list);
+                if (nurbp->queued)
+                        pltd->link = cpu_to_le32(nurbp->qh->dma_handle) | UHCI_PTR_QH;
+                else
+                        /* The next URB happens to be the beginning, so */
+                        /*  we're the last, end the chain */
+                        pltd->link = UHCI_PTR_TERM;
+        }
+
+        /* urbp->queue_list is handled in uhci_remove_qh() */
+}
+
+static struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct urb_priv *urbp;
+
+        urbp = kmem_cache_alloc(uhci_up_cachep, SLAB_ATOMIC);
+        if (!urbp)
+                return NULL;
+
+        memset((void *)urbp, 0, sizeof(*urbp));
+
+        urbp->inserttime = jiffies;
+        urbp->fsbrtime = jiffies;
+        urbp->urb = urb;
+        
+        INIT_LIST_HEAD(&urbp->td_list);
+        INIT_LIST_HEAD(&urbp->queue_list);
+        INIT_LIST_HEAD(&urbp->urb_list);
+
+        list_add_tail(&urbp->urb_list, &uhci->urb_list);
+
+        urb->hcpriv = urbp;
+
+        return urbp;
+}
+
+static void uhci_add_td_to_urb(struct urb *urb, struct uhci_td *td)
+{
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+
+        td->urb = urb;
+
+        list_add_tail(&td->list, &urbp->td_list);
+}
+
+static void uhci_remove_td_from_urb(struct uhci_td *td)
+{
+        if (list_empty(&td->list))
+                return;
+
+        list_del_init(&td->list);
+
+        td->urb = NULL;
+}
+
+static void uhci_destroy_urb_priv(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct uhci_td *td, *tmp;
+        struct urb_priv *urbp;
+
+        urbp = (struct urb_priv *)urb->hcpriv;
+        if (!urbp)
+                return;
+
+        if (!list_empty(&urbp->urb_list))
+                dev_warn(uhci_dev(uhci), "urb %p still on uhci->urb_list "
+                                "or uhci->remove_list!\n", urb);
+
+        uhci_get_current_frame_number(uhci);
+        if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age) {
+                uhci_free_pending_tds(uhci);
+                uhci->td_remove_age = uhci->frame_number;
+        }
+
+        /* Check to see if the remove list is empty. Set the IOC bit */
+        /* to force an interrupt so we can remove the TD's*/
+        if (list_empty(&uhci->td_remove_list))
+                uhci_set_next_interrupt(uhci);
+
+        list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
+                uhci_remove_td_from_urb(td);
+                uhci_remove_td(uhci, td);
+                list_add(&td->remove_list, &uhci->td_remove_list);
+        }
+
+        urb->hcpriv = NULL;
+        kmem_cache_free(uhci_up_cachep, urbp);
+}
+
+static void uhci_inc_fsbr(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+
+        if ((!(urb->transfer_flags & URB_NO_FSBR)) && !urbp->fsbr) {
+                urbp->fsbr = 1;
+                if (!uhci->fsbr++ && !uhci->fsbrtimeout)
+                        uhci->skel_term_qh->link = cpu_to_le32(uhci->skel_fs_control_qh->dma_handle) | UHCI_PTR_QH;
+        }
+}
+
+static void uhci_dec_fsbr(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+
+        if ((!(urb->transfer_flags & URB_NO_FSBR)) && urbp->fsbr) {
+                urbp->fsbr = 0;
+                if (!--uhci->fsbr)
+                        uhci->fsbrtimeout = jiffies + FSBR_DELAY;
+        }
+}
+
+/*
+ * Map status to standard result codes
+ *
+ * <status> is (td_status(td) & 0xF60000), a.k.a.
+ * uhci_status_bits(td_status(td)).
+ * Note: <status> does not include the TD_CTRL_NAK bit.
+ * <dir_out> is True for output TDs and False for input TDs.
+ */
+static int uhci_map_status(int status, int dir_out)
+{
+        if (!status)
+                return 0;
+        if (status & TD_CTRL_BITSTUFF)                  /* Bitstuff error */
+                return -EPROTO;
+        if (status & TD_CTRL_CRCTIMEO) {                /* CRC/Timeout */
+                if (dir_out)
+                        return -EPROTO;
+                else
+                        return -EILSEQ;
+        }
+        if (status & TD_CTRL_BABBLE)                    /* Babble */
+                return -EOVERFLOW;
+        if (status & TD_CTRL_DBUFERR)                   /* Buffer error */
+                return -ENOSR;
+        if (status & TD_CTRL_STALLED)                   /* Stalled */
+                return -EPIPE;
+        WARN_ON(status & TD_CTRL_ACTIVE);               /* Active */
+        return 0;
+}
+
+/*
+ * Control transfers
+ */
+static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
+{
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+        struct uhci_td *td;
+        struct uhci_qh *qh, *skelqh;
+        unsigned long destination, status;
+        int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+        int len = urb->transfer_buffer_length;
+        dma_addr_t data = urb->transfer_dma;
+
+        /* The "pipe" thing contains the destination in bits 8--18 */
+        destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
+
+        /* 3 errors */
+        status = TD_CTRL_ACTIVE | uhci_maxerr(3);
+        if (urb->dev->speed == USB_SPEED_LOW)
+                status |= TD_CTRL_LS;
+
+        /*
+         * Build the TD for the control request setup packet
+         */
+        td = uhci_alloc_td(uhci, urb->dev);
+        if (!td)
+                return -ENOMEM;
+
+        uhci_add_td_to_urb(urb, td);
+        uhci_fill_td(td, status, destination | uhci_explen(7),
+                urb->setup_dma);
+
+        /*
+         * If direction is "send", change the packet ID from SETUP (0x2D)
+         * to OUT (0xE1).  Else change it from SETUP to IN (0x69) and
+         * set Short Packet Detect (SPD) for all data packets.
+         */
+        if (usb_pipeout(urb->pipe))
+                destination ^= (USB_PID_SETUP ^ USB_PID_OUT);
+        else {
+                destination ^= (USB_PID_SETUP ^ USB_PID_IN);
+                status |= TD_CTRL_SPD;
+        }
+
+        /*
+         * Build the DATA TD's
+         */
+        while (len > 0) {
+                int pktsze = len;
+
+                if (pktsze > maxsze)
+                        pktsze = maxsze;
+
+                td = uhci_alloc_td(uhci, urb->dev);
+                if (!td)
+                        return -ENOMEM;
+
+                /* Alternate Data0/1 (start with Data1) */
+                destination ^= TD_TOKEN_TOGGLE;
+        
+                uhci_add_td_to_urb(urb, td);
+                uhci_fill_td(td, status, destination | uhci_explen(pktsze - 1),
+                        data);
+
+                data += pktsze;
+                len -= pktsze;
+        }
+
+        /*
+         * Build the final TD for control status 
+         */
+        td = uhci_alloc_td(uhci, urb->dev);
+        if (!td)
+                return -ENOMEM;
+
+        /*
+         * It's IN if the pipe is an output pipe or we're not expecting
+         * data back.
+         */
+        destination &= ~TD_TOKEN_PID_MASK;
+        if (usb_pipeout(urb->pipe) || !urb->transfer_buffer_length)
+                destination |= USB_PID_IN;
+        else
+                destination |= USB_PID_OUT;
+
+        destination |= TD_TOKEN_TOGGLE;         /* End in Data1 */
+
+        status &= ~TD_CTRL_SPD;
+
+        uhci_add_td_to_urb(urb, td);
+        uhci_fill_td(td, status | TD_CTRL_IOC,
+                destination | uhci_explen(UHCI_NULL_DATA_SIZE), 0);
+
+        qh = uhci_alloc_qh(uhci, urb->dev);
+        if (!qh)
+                return -ENOMEM;
+
+        urbp->qh = qh;
+        qh->urbp = urbp;
+
+        uhci_insert_tds_in_qh(qh, urb, UHCI_PTR_BREADTH);
+
+        /* Low-speed transfers get a different queue, and won't hog the bus.
+         * Also, some devices enumerate better without FSBR; the easiest way
+         * to do that is to put URBs on the low-speed queue while the device
+         * is in the DEFAULT state. */
+        if (urb->dev->speed == USB_SPEED_LOW ||
+                        urb->dev->state == USB_STATE_DEFAULT)
+                skelqh = uhci->skel_ls_control_qh;
+        else {
+                skelqh = uhci->skel_fs_control_qh;
+                uhci_inc_fsbr(uhci, urb);
+        }
+
+        if (eurb)
+                uhci_append_queued_urb(uhci, eurb, urb);
+        else
+                uhci_insert_qh(uhci, skelqh, urb);
+
+        return -EINPROGRESS;
+}
+
+/*
+ * If control-IN transfer was short, the status packet wasn't sent.
+ * This routine changes the element pointer in the QH to point at the
+ * status TD.  It's safe to do this even while the QH is live, because
+ * the hardware only updates the element pointer following a successful
+ * transfer.  The inactive TD for the short packet won't cause an update,
+ * so the pointer won't get overwritten.  The next time the controller
+ * sees this QH, it will send the status packet.
+ */
+static int usb_control_retrigger_status(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+        struct uhci_td *td;
+
+        urbp->short_control_packet = 1;
+
+        td = list_entry(urbp->td_list.prev, struct uhci_td, list);
+        urbp->qh->element = cpu_to_le32(td->dma_handle);
+
+        return -EINPROGRESS;
+}
+
+
+static int uhci_result_control(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct list_head *tmp, *head;
+        struct urb_priv *urbp = urb->hcpriv;
+        struct uhci_td *td;
+        unsigned int status;
+        int ret = 0;
+
+        if (list_empty(&urbp->td_list))
+                return -EINVAL;
+
+        head = &urbp->td_list;
+
+        if (urbp->short_control_packet) {
+                tmp = head->prev;
+                goto status_stage;
+        }
+
+        tmp = head->next;
+        td = list_entry(tmp, struct uhci_td, list);
+
+        /* The first TD is the SETUP stage, check the status, but skip */
+        /*  the count */
+        status = uhci_status_bits(td_status(td));
+        if (status & TD_CTRL_ACTIVE)
+                return -EINPROGRESS;
+
+        if (status)
+                goto td_error;
+
+        urb->actual_length = 0;
+
+        /* The rest of the TD's (but the last) are data */
+        tmp = tmp->next;
+        while (tmp != head && tmp->next != head) {
+                unsigned int ctrlstat;
+
+                td = list_entry(tmp, struct uhci_td, list);
+                tmp = tmp->next;
+
+                ctrlstat = td_status(td);
+                status = uhci_status_bits(ctrlstat);
+                if (status & TD_CTRL_ACTIVE)
+                        return -EINPROGRESS;
+
+                urb->actual_length += uhci_actual_length(ctrlstat);
+
+                if (status)
+                        goto td_error;
+
+                /* Check to see if we received a short packet */
+                if (uhci_actual_length(ctrlstat) <
+                                uhci_expected_length(td_token(td))) {
+                        if (urb->transfer_flags & URB_SHORT_NOT_OK) {
+                                ret = -EREMOTEIO;
+                                goto err;
+                        }
+
+                        if (uhci_packetid(td_token(td)) == USB_PID_IN)
+                                return usb_control_retrigger_status(uhci, urb);
+                        else
+                                return 0;
+                }
+        }
+
+status_stage:
+        td = list_entry(tmp, struct uhci_td, list);
+
+        /* Control status stage */
+        status = td_status(td);
+
+#ifdef I_HAVE_BUGGY_APC_BACKUPS
+        /* APC BackUPS Pro kludge */
+        /* It tries to send all of the descriptor instead of the amount */
+        /*  we requested */
+        if (status & TD_CTRL_IOC &&     /* IOC is masked out by uhci_status_bits */
+            status & TD_CTRL_ACTIVE &&
+            status & TD_CTRL_NAK)
+                return 0;
+#endif
+
+        status = uhci_status_bits(status);
+        if (status & TD_CTRL_ACTIVE)
+                return -EINPROGRESS;
+
+        if (status)
+                goto td_error;
+
+        return 0;
+
+td_error:
+        ret = uhci_map_status(status, uhci_packetout(td_token(td)));
+
+err:
+        if ((debug == 1 && ret != -EPIPE) || debug > 1) {
+                /* Some debugging code */
+                dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
+                                __FUNCTION__, status);
+
+                if (errbuf) {
+                        /* Print the chain for debugging purposes */
+                        uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
+
+                        lprintk(errbuf);
+                }
+        }
+
+        return ret;
+}
+
+/*
+ * Common submit for bulk and interrupt
+ */
+static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb, struct uhci_qh *skelqh)
+{
+        struct uhci_td *td;
+        struct uhci_qh *qh;
+        unsigned long destination, status;
+        int maxsze = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
+        int len = urb->transfer_buffer_length;
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+        dma_addr_t data = urb->transfer_dma;
+
+        if (len < 0)
+                return -EINVAL;
+
+        /* The "pipe" thing contains the destination in bits 8--18 */
+        destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
+
+        status = uhci_maxerr(3) | TD_CTRL_ACTIVE;
+        if (urb->dev->speed == USB_SPEED_LOW)
+                status |= TD_CTRL_LS;
+        if (usb_pipein(urb->pipe))
+                status |= TD_CTRL_SPD;
+
+        /*
+         * Build the DATA TD's
+         */
+        do {    /* Allow zero length packets */
+                int pktsze = maxsze;
+
+                if (pktsze >= len) {
+                        pktsze = len;
+                        if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
+                                status &= ~TD_CTRL_SPD;
+                }
+
+                td = uhci_alloc_td(uhci, urb->dev);
+                if (!td)
+                        return -ENOMEM;
+
+                uhci_add_td_to_urb(urb, td);
+                uhci_fill_td(td, status, destination | uhci_explen(pktsze - 1) |
+                        (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+                         usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
+                        data);
+
+                data += pktsze;
+                len -= maxsze;
+
+                usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+                        usb_pipeout(urb->pipe));
+        } while (len > 0);
+
+        /*
+         * URB_ZERO_PACKET means adding a 0-length packet, if direction
+         * is OUT and the transfer_length was an exact multiple of maxsze,
+         * hence (len = transfer_length - N * maxsze) == 0
+         * however, if transfer_length == 0, the zero packet was already
+         * prepared above.
+         */
+        if (usb_pipeout(urb->pipe) && (urb->transfer_flags & URB_ZERO_PACKET) &&
+            !len && urb->transfer_buffer_length) {
+                td = uhci_alloc_td(uhci, urb->dev);
+                if (!td)
+                        return -ENOMEM;
+
+                uhci_add_td_to_urb(urb, td);
+                uhci_fill_td(td, status, destination | uhci_explen(UHCI_NULL_DATA_SIZE) |
+                        (usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+                         usb_pipeout(urb->pipe)) << TD_TOKEN_TOGGLE_SHIFT),
+                        data);
+
+                usb_dotoggle(urb->dev, usb_pipeendpoint(urb->pipe),
+                        usb_pipeout(urb->pipe));
+        }
+
+        /* Set the interrupt-on-completion flag on the last packet.
+         * A more-or-less typical 4 KB URB (= size of one memory page)
+         * will require about 3 ms to transfer; that's a little on the
+         * fast side but not enough to justify delaying an interrupt
+         * more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT
+         * flag setting. */
+        td->status |= cpu_to_le32(TD_CTRL_IOC);
+
+        qh = uhci_alloc_qh(uhci, urb->dev);
+        if (!qh)
+                return -ENOMEM;
+
+        urbp->qh = qh;
+        qh->urbp = urbp;
+
+        /* Always breadth first */
+        uhci_insert_tds_in_qh(qh, urb, UHCI_PTR_BREADTH);
+
+        if (eurb)
+                uhci_append_queued_urb(uhci, eurb, urb);
+        else
+                uhci_insert_qh(uhci, skelqh, urb);
+
+        return -EINPROGRESS;
+}
+
+/*
+ * Common result for bulk and interrupt
+ */
+static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct urb_priv *urbp = urb->hcpriv;
+        struct uhci_td *td;
+        unsigned int status = 0;
+        int ret = 0;
+
+        urb->actual_length = 0;
+
+        list_for_each_entry(td, &urbp->td_list, list) {
+                unsigned int ctrlstat = td_status(td);
+
+                status = uhci_status_bits(ctrlstat);
+                if (status & TD_CTRL_ACTIVE)
+                        return -EINPROGRESS;
+
+                urb->actual_length += uhci_actual_length(ctrlstat);
+
+                if (status)
+                        goto td_error;
+
+                if (uhci_actual_length(ctrlstat) <
+                                uhci_expected_length(td_token(td))) {
+                        if (urb->transfer_flags & URB_SHORT_NOT_OK) {
+                                ret = -EREMOTEIO;
+                                goto err;
+                        } else
+                                return 0;
+                }
+        }
+
+        return 0;
+
+td_error:
+        ret = uhci_map_status(status, uhci_packetout(td_token(td)));
+
+err:
+        /* 
+         * Enable this chunk of code if you want to see some more debugging.
+         * But be careful, it has the tendancy to starve out khubd and prevent
+         * disconnects from happening successfully if you have a slow debug
+         * log interface (like a serial console.
+         */
+#if 0
+        if ((debug == 1 && ret != -EPIPE) || debug > 1) {
+                /* Some debugging code */
+                dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
+                                __FUNCTION__, status);
+
+                if (errbuf) {
+                        /* Print the chain for debugging purposes */
+                        uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
+
+                        lprintk(errbuf);
+                }
+        }
+#endif
+        return ret;
+}
+
+static inline int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
+{
+        int ret;
+
+        /* Can't have low-speed bulk transfers */
+        if (urb->dev->speed == USB_SPEED_LOW)
+                return -EINVAL;
+
+        ret = uhci_submit_common(uhci, urb, eurb, uhci->skel_bulk_qh);
+        if (ret == -EINPROGRESS)
+                uhci_inc_fsbr(uhci, urb);
+
+        return ret;
+}
+
+static inline int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb, struct urb *eurb)
+{
+        /* USB 1.1 interrupt transfers only involve one packet per interval;
+         * that's the uhci_submit_common() "breadth first" policy.  Drivers
+         * can submit urbs of any length, but longer ones might need many
+         * intervals to complete.
+         */
+        return uhci_submit_common(uhci, urb, eurb, uhci->skelqh[__interval_to_skel(urb->interval)]);
+}
+
+/*
+ * Isochronous transfers
+ */
+static int isochronous_find_limits(struct uhci_hcd *uhci, struct urb *urb, unsigned int *start, unsigned int *end)
+{
+        struct urb *last_urb = NULL;
+        struct urb_priv *up;
+        int ret = 0;
+
+        list_for_each_entry(up, &uhci->urb_list, urb_list) {
+                struct urb *u = up->urb;
+
+                /* look for pending URB's with identical pipe handle */
+                if ((urb->pipe == u->pipe) && (urb->dev == u->dev) &&
+                    (u->status == -EINPROGRESS) && (u != urb)) {
+                        if (!last_urb)
+                                *start = u->start_frame;
+                        last_urb = u;
+                }
+        }
+
+        if (last_urb) {
+                *end = (last_urb->start_frame + last_urb->number_of_packets *
+                                last_urb->interval) & (UHCI_NUMFRAMES-1);
+                ret = 0;
+        } else
+                ret = -1;       /* no previous urb found */
+
+        return ret;
+}
+
+static int isochronous_find_start(struct uhci_hcd *uhci, struct urb *urb)
+{
+        int limits;
+        unsigned int start = 0, end = 0;
+
+        if (urb->number_of_packets > 900)       /* 900? Why? */
+                return -EFBIG;
+
+        limits = isochronous_find_limits(uhci, urb, &start, &end);
+
+        if (urb->transfer_flags & URB_ISO_ASAP) {
+                if (limits) {
+                        uhci_get_current_frame_number(uhci);
+                        urb->start_frame = (uhci->frame_number + 10)
+                                        & (UHCI_NUMFRAMES - 1);
+                } else
+                        urb->start_frame = end;
+        } else {
+                urb->start_frame &= (UHCI_NUMFRAMES - 1);
+                /* FIXME: Sanity check */
+        }
+
+        return 0;
+}
+
+/*
+ * Isochronous transfers
+ */
+static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct uhci_td *td;
+        int i, ret, frame;
+        int status, destination;
+
+        status = TD_CTRL_ACTIVE | TD_CTRL_IOS;
+        destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe);
+
+        ret = isochronous_find_start(uhci, urb);
+        if (ret)
+                return ret;
+
+        frame = urb->start_frame;
+        for (i = 0; i < urb->number_of_packets; i++, frame += urb->interval) {
+                if (!urb->iso_frame_desc[i].length)
+                        continue;
+
+                td = uhci_alloc_td(uhci, urb->dev);
+                if (!td)
+                        return -ENOMEM;
+
+                uhci_add_td_to_urb(urb, td);
+                uhci_fill_td(td, status, destination | uhci_explen(urb->iso_frame_desc[i].length - 1),
+                        urb->transfer_dma + urb->iso_frame_desc[i].offset);
+
+                if (i + 1 >= urb->number_of_packets)
+                        td->status |= cpu_to_le32(TD_CTRL_IOC);
+
+                uhci_insert_td_frame_list(uhci, td, frame);
+        }
+
+        return -EINPROGRESS;
+}
+
+static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct uhci_td *td;
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+        int status;
+        int i, ret = 0;
+
+        urb->actual_length = 0;
+
+        i = 0;
+        list_for_each_entry(td, &urbp->td_list, list) {
+                int actlength;
+                unsigned int ctrlstat = td_status(td);
+
+                if (ctrlstat & TD_CTRL_ACTIVE)
+                        return -EINPROGRESS;
+
+                actlength = uhci_actual_length(ctrlstat);
+                urb->iso_frame_desc[i].actual_length = actlength;
+                urb->actual_length += actlength;
+
+                status = uhci_map_status(uhci_status_bits(ctrlstat),
+                                usb_pipeout(urb->pipe));
+                urb->iso_frame_desc[i].status = status;
+                if (status) {
+                        urb->error_count++;
+                        ret = status;
+                }
+
+                i++;
+        }
+
+        return ret;
+}
+
+static struct urb *uhci_find_urb_ep(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct urb_priv *up;
+
+        /* We don't match Isoc transfers since they are special */
+        if (usb_pipeisoc(urb->pipe))
+                return NULL;
+
+        list_for_each_entry(up, &uhci->urb_list, urb_list) {
+                struct urb *u = up->urb;
+
+                if (u->dev == urb->dev && u->status == -EINPROGRESS) {
+                        /* For control, ignore the direction */
+                        if (usb_pipecontrol(urb->pipe) &&
+                            (u->pipe & ~USB_DIR_IN) == (urb->pipe & ~USB_DIR_IN))
+                                return u;
+                        else if (u->pipe == urb->pipe)
+                                return u;
+                }
+        }
+
+        return NULL;
+}
+
+static int uhci_urb_enqueue(struct usb_hcd *hcd,
+                struct usb_host_endpoint *ep,
+                struct urb *urb, int mem_flags)
+{
+        int ret;
+        struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+        unsigned long flags;
+        struct urb *eurb;
+        int bustime;
+
+        spin_lock_irqsave(&uhci->lock, flags);
+
+        ret = urb->status;
+        if (ret != -EINPROGRESS)                /* URB already unlinked! */
+                goto out;
+
+        eurb = uhci_find_urb_ep(uhci, urb);
+
+        if (!uhci_alloc_urb_priv(uhci, urb)) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        switch (usb_pipetype(urb->pipe)) {
+        case PIPE_CONTROL:
+                ret = uhci_submit_control(uhci, urb, eurb);
+                break;
+        case PIPE_INTERRUPT:
+                if (!eurb) {
+                        bustime = usb_check_bandwidth(urb->dev, urb);
+                        if (bustime < 0)
+                                ret = bustime;
+                        else {
+                                ret = uhci_submit_interrupt(uhci, urb, eurb);
+                                if (ret == -EINPROGRESS)
+                                        usb_claim_bandwidth(urb->dev, urb, bustime, 0);
+                        }
+                } else {        /* inherit from parent */
+                        urb->bandwidth = eurb->bandwidth;
+                        ret = uhci_submit_interrupt(uhci, urb, eurb);
+                }
+                break;
+        case PIPE_BULK:
+                ret = uhci_submit_bulk(uhci, urb, eurb);
+                break;
+        case PIPE_ISOCHRONOUS:
+                bustime = usb_check_bandwidth(urb->dev, urb);
+                if (bustime < 0) {
+                        ret = bustime;
+                        break;
+                }
+
+                ret = uhci_submit_isochronous(uhci, urb);
+                if (ret == -EINPROGRESS)
+                        usb_claim_bandwidth(urb->dev, urb, bustime, 1);
+                break;
+        }
+
+        if (ret != -EINPROGRESS) {
+                /* Submit failed, so delete it from the urb_list */
+                struct urb_priv *urbp = urb->hcpriv;
+
+                list_del_init(&urbp->urb_list);
+                uhci_destroy_urb_priv(uhci, urb);
+        } else
+                ret = 0;
+
+out:
+        spin_unlock_irqrestore(&uhci->lock, flags);
+        return ret;
+}
+
+/*
+ * Return the result of a transfer
+ */
+static void uhci_transfer_result(struct uhci_hcd *uhci, struct urb *urb)
+{
+        int ret = -EINPROGRESS;
+        struct urb_priv *urbp;
+
+        spin_lock(&urb->lock);
+
+        urbp = (struct urb_priv *)urb->hcpriv;
+
+        if (urb->status != -EINPROGRESS)        /* URB already dequeued */
+                goto out;
+
+        switch (usb_pipetype(urb->pipe)) {
+        case PIPE_CONTROL:
+                ret = uhci_result_control(uhci, urb);
+                break;
+        case PIPE_BULK:
+        case PIPE_INTERRUPT:
+                ret = uhci_result_common(uhci, urb);
+                break;
+        case PIPE_ISOCHRONOUS:
+                ret = uhci_result_isochronous(uhci, urb);
+                break;
+        }
+
+        if (ret == -EINPROGRESS)
+                goto out;
+        urb->status = ret;
+
+        switch (usb_pipetype(urb->pipe)) {
+        case PIPE_CONTROL:
+        case PIPE_BULK:
+        case PIPE_ISOCHRONOUS:
+                /* Release bandwidth for Interrupt or Isoc. transfers */
+                if (urb->bandwidth)
+                        usb_release_bandwidth(urb->dev, urb, 1);
+                uhci_unlink_generic(uhci, urb);
+                break;
+        case PIPE_INTERRUPT:
+                /* Release bandwidth for Interrupt or Isoc. transfers */
+                /* Make sure we don't release if we have a queued URB */
+                if (list_empty(&urbp->queue_list) && urb->bandwidth)
+                        usb_release_bandwidth(urb->dev, urb, 0);
+                else
+                        /* bandwidth was passed on to queued URB, */
+                        /* so don't let usb_unlink_urb() release it */
+                        urb->bandwidth = 0;
+                uhci_unlink_generic(uhci, urb);
+                break;
+        default:
+                dev_info(uhci_dev(uhci), "%s: unknown pipe type %d "
+                                "for urb %p\n",
+                                __FUNCTION__, usb_pipetype(urb->pipe), urb);
+        }
+
+        /* Move it from uhci->urb_list to uhci->complete_list */
+        uhci_moveto_complete(uhci, urbp);
+
+out:
+        spin_unlock(&urb->lock);
+}
+
+static void uhci_unlink_generic(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct list_head *head;
+        struct uhci_td *td;
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+        int prevactive = 0;
+
+        uhci_dec_fsbr(uhci, urb);       /* Safe since it checks */
+
+        /*
+         * Now we need to find out what the last successful toggle was
+         * so we can update the local data toggle for the next transfer
+         *
+         * There are 2 ways the last successful completed TD is found:
+         *
+         * 1) The TD is NOT active and the actual length < expected length
+         * 2) The TD is NOT active and it's the last TD in the chain
+         *
+         * and a third way the first uncompleted TD is found:
+         *
+         * 3) The TD is active and the previous TD is NOT active
+         *
+         * Control and Isochronous ignore the toggle, so this is safe
+         * for all types
+         *
+         * FIXME: The toggle fixups won't be 100% reliable until we
+         * change over to using a single queue for each endpoint and
+         * stop the queue before unlinking.
+         */
+        head = &urbp->td_list;
+        list_for_each_entry(td, head, list) {
+                unsigned int ctrlstat = td_status(td);
+
+                if (!(ctrlstat & TD_CTRL_ACTIVE) &&
+                                (uhci_actual_length(ctrlstat) <
+                                 uhci_expected_length(td_token(td)) ||
+                                td->list.next == head))
+                        usb_settoggle(urb->dev, uhci_endpoint(td_token(td)),
+                                uhci_packetout(td_token(td)),
+                                uhci_toggle(td_token(td)) ^ 1);
+                else if ((ctrlstat & TD_CTRL_ACTIVE) && !prevactive)
+                        usb_settoggle(urb->dev, uhci_endpoint(td_token(td)),
+                                uhci_packetout(td_token(td)),
+                                uhci_toggle(td_token(td)));
+
+                prevactive = ctrlstat & TD_CTRL_ACTIVE;
+        }
+
+        uhci_delete_queued_urb(uhci, urb);
+
+        /* The interrupt loop will reclaim the QH's */
+        uhci_remove_qh(uhci, urbp->qh);
+        urbp->qh = NULL;
+}
+
+static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
+{
+        struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+        unsigned long flags;
+        struct urb_priv *urbp;
+
+        spin_lock_irqsave(&uhci->lock, flags);
+        urbp = urb->hcpriv;
+        if (!urbp)                      /* URB was never linked! */
+                goto done;
+        list_del_init(&urbp->urb_list);
+
+        uhci_unlink_generic(uhci, urb);
+
+        uhci_get_current_frame_number(uhci);
+        if (uhci->frame_number + uhci->is_stopped != uhci->urb_remove_age) {
+                uhci_remove_pending_urbps(uhci);
+                uhci->urb_remove_age = uhci->frame_number;
+        }
+
+        /* If we're the first, set the next interrupt bit */
+        if (list_empty(&uhci->urb_remove_list))
+                uhci_set_next_interrupt(uhci);
+        list_add_tail(&urbp->urb_list, &uhci->urb_remove_list);
+
+done:
+        spin_unlock_irqrestore(&uhci->lock, flags);
+        return 0;
+}
+
+static int uhci_fsbr_timeout(struct uhci_hcd *uhci, struct urb *urb)
+{
+        struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
+        struct list_head *head;
+        struct uhci_td *td;
+        int count = 0;
+
+        uhci_dec_fsbr(uhci, urb);
+
+        urbp->fsbr_timeout = 1;
+
+        /*
+         * Ideally we would want to fix qh->element as well, but it's
+         * read/write by the HC, so that can introduce a race. It's not
+         * really worth the hassle
+         */
+
+        head = &urbp->td_list;
+        list_for_each_entry(td, head, list) {
+                /*
+                 * Make sure we don't do the last one (since it'll have the
+                 * TERM bit set) as well as we skip every so many TD's to
+                 * make sure it doesn't hog the bandwidth
+                 */
+                if (td->list.next != head && (count % DEPTH_INTERVAL) ==
+                                (DEPTH_INTERVAL - 1))
+                        td->link |= UHCI_PTR_DEPTH;
+
+                count++;
+        }
+
+        return 0;
+}
+
+static void uhci_free_pending_qhs(struct uhci_hcd *uhci)
+{
+        struct uhci_qh *qh, *tmp;
+
+        list_for_each_entry_safe(qh, tmp, &uhci->qh_remove_list, remove_list) {
+                list_del_init(&qh->remove_list);
+
+                uhci_free_qh(uhci, qh);
+        }
+}
+
+static void uhci_free_pending_tds(struct uhci_hcd *uhci)
+{
+        struct uhci_td *td, *tmp;
+
+        list_for_each_entry_safe(td, tmp, &uhci->td_remove_list, remove_list) {
+                list_del_init(&td->remove_list);
+
+                uhci_free_td(uhci, td);
+        }
+}
+
+static void
+uhci_finish_urb(struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
+__releases(uhci->lock)
+__acquires(uhci->lock)
+{
+        struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+
+        uhci_destroy_urb_priv(uhci, urb);
+
+        spin_unlock(&uhci->lock);
+        usb_hcd_giveback_urb(hcd, urb, regs);
+        spin_lock(&uhci->lock);
+}
+
+static void uhci_finish_completion(struct uhci_hcd *uhci, struct pt_regs *regs)
+{
+        struct urb_priv *urbp, *tmp;
+
+        list_for_each_entry_safe(urbp, tmp, &uhci->complete_list, urb_list) {
+                struct urb *urb = urbp->urb;
+
+                list_del_init(&urbp->urb_list);
+                uhci_finish_urb(uhci_to_hcd(uhci), urb, regs);
+        }
+}
+
+static void uhci_remove_pending_urbps(struct uhci_hcd *uhci)
+{
+
+        /* Splice the urb_remove_list onto the end of the complete_list */
+        list_splice_init(&uhci->urb_remove_list, uhci->complete_list.prev);
+}
+
+/* Process events in the schedule, but only in one thread at a time */
+static void uhci_scan_schedule(struct uhci_hcd *uhci, struct pt_regs *regs)
+{
+        struct urb_priv *urbp, *tmp;
+
+        /* Don't allow re-entrant calls */
+        if (uhci->scan_in_progress) {
+                uhci->need_rescan = 1;
+                return;
+        }
+        uhci->scan_in_progress = 1;
+ rescan:
+        uhci->need_rescan = 0;
+
+        uhci_get_current_frame_number(uhci);
+
+        if (uhci->frame_number + uhci->is_stopped != uhci->qh_remove_age)
+                uhci_free_pending_qhs(uhci);
+        if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age)
+                uhci_free_pending_tds(uhci);
+        if (uhci->frame_number + uhci->is_stopped != uhci->urb_remove_age)
+                uhci_remove_pending_urbps(uhci);
+
+        /* Walk the list of pending URBs to see which ones completed
+         * (must be _safe because uhci_transfer_result() dequeues URBs) */
+        list_for_each_entry_safe(urbp, tmp, &uhci->urb_list, urb_list) {
+                struct urb *urb = urbp->urb;
+
+                /* Checks the status and does all of the magic necessary */
+                uhci_transfer_result(uhci, urb);
+        }
+        uhci_finish_completion(uhci, regs);
+
+        /* If the controller is stopped, we can finish these off right now */
+        if (uhci->is_stopped) {
+                uhci_free_pending_qhs(uhci);
+                uhci_free_pending_tds(uhci);
+                uhci_remove_pending_urbps(uhci);
+        }
+
+        if (uhci->need_rescan)
+                goto rescan;
+        uhci->scan_in_progress = 0;
+
+        if (list_empty(&uhci->urb_remove_list) &&
+            list_empty(&uhci->td_remove_list) &&
+            list_empty(&uhci->qh_remove_list))
+                uhci_clear_next_interrupt(uhci);
+        else
+                uhci_set_next_interrupt(uhci);
+
+        /* Wake up anyone waiting for an URB to complete */
+        wake_up_all(&uhci->waitqh);
+}