USB: OHCI: revert the ZF Micro orphan-TD quirk

This patch reverts the important parts of commit 89a0fd18a96e (USB:
OHCI handles more ZFMicro quirks), namely, the parts related to
handling orphan TDs for interrupt endpoints.  A later patch in this
series will introduce a more general mechanism that applies to all
endpoint types and all controllers.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 5 insertions, 160 deletions

diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 7570098b1cfa..a8f0e1b00e7d 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -355,8 +355,6 @@ rescan:
         if (ohci->rh_state != OHCI_RH_RUNNING) {
 sanitize:
                 ed->state = ED_IDLE;
-                if (quirk_zfmicro(ohci) && ed->type == PIPE_INTERRUPT)
-                        ohci->eds_scheduled--;
                 finish_unlinks (ohci, 0);
         }
 
@@ -365,11 +363,6 @@ sanitize:
                 /* major IRQ delivery trouble loses INTR_SF too... */
                 if (limit-- == 0) {
                         ohci_warn(ohci, "ED unlink timeout\n");
-                        if (quirk_zfmicro(ohci)) {
-                                ohci_warn(ohci, "Attempting ZF TD recovery\n");
-                                ohci->ed_to_check = ed;
-                                ohci->zf_delay = 2;
-                        }
                         goto sanitize;
                 }
                 spin_unlock_irqrestore (&ohci->lock, flags);
@@ -431,93 +424,6 @@ ohci_shutdown (struct usb_hcd *hcd)
         ohci_writel(ohci, ohci->fminterval, &ohci->regs->fminterval);
 }
 
-static int check_ed(struct ohci_hcd *ohci, struct ed *ed)
-{
-        return (hc32_to_cpu(ohci, ed->hwINFO) & ED_IN) != 0
-                && (hc32_to_cpu(ohci, ed->hwHeadP) & TD_MASK)
-                        == (hc32_to_cpu(ohci, ed->hwTailP) & TD_MASK)
-                && !list_empty(&ed->td_list);
-}
-
-/* ZF Micro watchdog timer callback. The ZF Micro chipset sometimes completes
- * an interrupt TD but neglects to add it to the donelist.  On systems with
- * this chipset, we need to periodically check the state of the queues to look
- * for such "lost" TDs.
- */
-static void unlink_watchdog_func(unsigned long _ohci)
-{
-        unsigned long   flags;
-        unsigned        max;
-        unsigned        seen_count = 0;
-        unsigned        i;
-        struct ed       **seen = NULL;
-        struct ohci_hcd *ohci = (struct ohci_hcd *) _ohci;
-
-        spin_lock_irqsave(&ohci->lock, flags);
-        max = ohci->eds_scheduled;
-        if (!max)
-                goto done;
-
-        if (ohci->ed_to_check)
-                goto out;
-
-        seen = kcalloc(max, sizeof *seen, GFP_ATOMIC);
-        if (!seen)
-                goto out;
-
-        for (i = 0; i < NUM_INTS; i++) {
-                struct ed       *ed = ohci->periodic[i];
-
-                while (ed) {
-                        unsigned        temp;
-
-                        /* scan this branch of the periodic schedule tree */
-                        for (temp = 0; temp < seen_count; temp++) {
-                                if (seen[temp] == ed) {
-                                        /* we've checked it and what's after */
-                                        ed = NULL;
-                                        break;
-                                }
-                        }
-                        if (!ed)
-                                break;
-                        seen[seen_count++] = ed;
-                        if (!check_ed(ohci, ed)) {
-                                ed = ed->ed_next;
-                                continue;
-                        }
-
-                        /* HC's TD list is empty, but HCD sees at least one
-                         * TD that's not been sent through the donelist.
-                         */
-                        ohci->ed_to_check = ed;
-                        ohci->zf_delay = 2;
-
-                        /* The HC may wait until the next frame to report the
-                         * TD as done through the donelist and INTR_WDH.  (We
-                         * just *assume* it's not a multi-TD interrupt URB;
-                         * those could defer the IRQ more than one frame, using
-                         * DI...)  Check again after the next INTR_SF.
-                         */
-                        ohci_writel(ohci, OHCI_INTR_SF,
-                                        &ohci->regs->intrstatus);
-                        ohci_writel(ohci, OHCI_INTR_SF,
-                                        &ohci->regs->intrenable);
-
-                        /* flush those writes */
-                        (void) ohci_readl(ohci, &ohci->regs->control);
-
-                        goto out;
-                }
-        }
-out:
-        kfree(seen);
-        if (ohci->eds_scheduled)
-                mod_timer(&ohci->unlink_watchdog, round_jiffies(jiffies + HZ));
-done:
-        spin_unlock_irqrestore(&ohci->lock, flags);
-}
-
 /*-------------------------------------------------------------------------*
  * HC functions
  *-------------------------------------------------------------------------*/
@@ -761,15 +667,6 @@ retry:
         // POTPGT delay is bits 24-31, in 2 ms units.
         mdelay ((val >> 23) & 0x1fe);
 
-        if (quirk_zfmicro(ohci)) {
-                /* Create timer to watch for bad queue state on ZF Micro */
-                setup_timer(&ohci->unlink_watchdog, unlink_watchdog_func,
-                                (unsigned long) ohci);
-
-                ohci->eds_scheduled = 0;
-                ohci->ed_to_check = NULL;
-        }
-
         ohci_dump(ohci);
 
         return 0;
@@ -895,31 +792,6 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd)
                 spin_unlock (&ohci->lock);
         }
 
-        if (quirk_zfmicro(ohci) && (ints & OHCI_INTR_SF)) {
-                spin_lock(&ohci->lock);
-                if (ohci->ed_to_check) {
-                        struct ed *ed = ohci->ed_to_check;
-
-                        if (check_ed(ohci, ed)) {
-                                /* HC thinks the TD list is empty; HCD knows
-                                 * at least one TD is outstanding
-                                 */
-                                if (--ohci->zf_delay == 0) {
-                                        struct td *td = list_entry(
-                                                ed->td_list.next,
-                                                struct td, td_list);
-                                        ohci_warn(ohci,
-                                                  "Reclaiming orphan TD %p\n",
-                                                  td);
-                                        takeback_td(ohci, td);
-                                        ohci->ed_to_check = NULL;
-                                }
-                        } else
-                                ohci->ed_to_check = NULL;
-                }
-                spin_unlock(&ohci->lock);
-        }
-
         /* could track INTR_SO to reduce available PCI/... bandwidth */
 
         /* handle any pending URB/ED unlinks, leaving INTR_SF enabled
@@ -928,9 +800,7 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd)
         spin_lock (&ohci->lock);
         if (ohci->ed_rm_list)
                 finish_unlinks (ohci, ohci_frame_no(ohci));
-        if ((ints & OHCI_INTR_SF) != 0
-                        && !ohci->ed_rm_list
-                        && !ohci->ed_to_check
+        if ((ints & OHCI_INTR_SF) != 0 && !ohci->ed_rm_list
                         && ohci->rh_state == OHCI_RH_RUNNING)
                 ohci_writel (ohci, OHCI_INTR_SF, &regs->intrdisable);
         spin_unlock (&ohci->lock);
@@ -961,8 +831,6 @@ static void ohci_stop (struct usb_hcd *hcd)
         free_irq(hcd->irq, hcd);
         hcd->irq = 0;
 
-        if (quirk_zfmicro(ohci))
-                del_timer(&ohci->unlink_watchdog);
         if (quirk_amdiso(ohci))
                 usb_amd_dev_put();
 
diff --git a/drivers/usb/host/ohci-q.c b/drivers/usb/host/ohci-q.c
index a6376f3e55cb..a9f4f04c3fad 100644
--- a/drivers/usb/host/ohci-q.c
+++ b/drivers/usb/host/ohci-q.c
@@ -187,10 +187,6 @@ static int ed_schedule (struct ohci_hcd *ohci, struct ed *ed)
         ed->ed_prev = NULL;
         ed->ed_next = NULL;
         ed->hwNextED = 0;
-        if (quirk_zfmicro(ohci)
-                        && (ed->type == PIPE_INTERRUPT)
-                        && !(ohci->eds_scheduled++))
-                mod_timer(&ohci->unlink_watchdog, round_jiffies(jiffies + HZ));
         wmb ();
 
         /* we care about rm_list when setting CLE/BLE in case the HC was at
@@ -977,19 +973,13 @@ skip_ed:
                                                                 TD_MASK;
 
                                 /* INTR_WDH may need to clean up first */
-                                if (td->td_dma != head) {
-                                        if (ed == ohci->ed_to_check)
-                                                ohci->ed_to_check = NULL;
-                                        else
-                                                goto skip_ed;
-                                }
+                                if (td->td_dma != head)
+                                        goto skip_ed;
                         }
                 }
 
                 /* ED's now officially unlinked, hc doesn't see */
                 ed->state = ED_IDLE;
-                if (quirk_zfmicro(ohci) && ed->type == PIPE_INTERRUPT)
-                        ohci->eds_scheduled--;
                 ed->hwHeadP &= ~cpu_to_hc32(ohci, ED_H);
                 ed->hwNextED = 0;
                 wmb();
@@ -1122,12 +1112,7 @@ rescan_this:
 
 /*-------------------------------------------------------------------------*/
 
-/*
- * Used to take back a TD from the host controller. This would normally be
- * called from within dl_done_list, however it may be called directly if the
- * HC no longer sees the TD and it has not appeared on the donelist (after
- * two frames).  This bug has been observed on ZF Micro systems.
- */
+/* Take back a TD from the host controller */
 static void takeback_td(struct ohci_hcd *ohci, struct td *td)
 {
         struct urb      *urb = td->urb;
@@ -1174,9 +1159,7 @@ static void takeback_td(struct ohci_hcd *ohci, struct td *td)
  *
  * This is the main path for handing urbs back to drivers.  The only other
  * normal path is finish_unlinks(), which unlinks URBs using ed_rm_list,
- * instead of scanning the (re-reversed) donelist as this does.  There's
- * an abnormal path too, handling a quirk in some Compaq silicon:  URBs
- * with TDs that appear to be orphaned are directly reclaimed.
+ * instead of scanning the (re-reversed) donelist as this does.
  */
 static void
 dl_done_list (struct ohci_hcd *ohci)
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
index 05e02a709d4f..392932dd6318 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -411,12 +411,6 @@ struct ohci_hcd {
 
         struct work_struct      nec_work;       /* Worker for NEC quirk */
 
-        /* Needed for ZF Micro quirk */
-        struct timer_list       unlink_watchdog;
-        unsigned                eds_scheduled;
-        struct ed               *ed_to_check;
-        unsigned                zf_delay;
-
         struct dentry           *debug_dir;
         struct dentry           *debug_async;
         struct dentry           *debug_periodic;