diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index c13dad8..9f26080 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -93,8 +93,6 @@
  */
 #define	EHCI_TUNE_FLS		1	/* (medium) 512-frame schedule */
 
-#define EHCI_IO_JIFFIES		(HZ/10)		/* io watchdog > irq_thresh */
-
 /* Initial IRQ latency:  faster than hw default */
 static int log2_irq_thresh = 0;		// 0 to 6
 module_param (log2_irq_thresh, int, S_IRUGO);
@@ -125,25 +123,6 @@
 
 /*-------------------------------------------------------------------------*/
 
-static void
-timer_action(struct ehci_hcd *ehci, enum ehci_timer_action action)
-{
-	if (!test_and_set_bit(action, &ehci->actions)) {
-		unsigned long t;
-
-		switch (action) {
-		case TIMER_IO_WATCHDOG:
-			if (!ehci->need_io_watchdog)
-				return;
-			t = EHCI_IO_JIFFIES;
-			break;
-		}
-		mod_timer(&ehci->watchdog, t + jiffies);
-	}
-}
-
-/*-------------------------------------------------------------------------*/
-
 /*
  * handshake - spin reading hc until handshake completes or fails
  * @ptr: address of hc register to be read
@@ -307,19 +286,6 @@
 
 /*-------------------------------------------------------------------------*/
 
-static void ehci_watchdog(unsigned long param)
-{
-	struct ehci_hcd		*ehci = (struct ehci_hcd *) param;
-	unsigned long		flags;
-
-	spin_lock_irqsave(&ehci->lock, flags);
-
-	/* ehci could run by timer, without IRQs ... */
-	ehci_work (ehci);
-
-	spin_unlock_irqrestore (&ehci->lock, flags);
-}
-
 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
  * The firmware seems to think that powering off is a wakeup event!
  * This routine turns off remote wakeup and everything else, on all ports.
@@ -357,8 +323,6 @@
 {
 	struct ehci_hcd	*ehci = hcd_to_ehci(hcd);
 
-	del_timer_sync(&ehci->watchdog);
-
 	spin_lock_irq(&ehci->lock);
 	ehci->rh_state = EHCI_RH_STOPPING;
 	ehci_silence_controller(ehci);
@@ -394,8 +358,6 @@
  */
 static void ehci_work (struct ehci_hcd *ehci)
 {
-	timer_action_done (ehci, TIMER_IO_WATCHDOG);
-
 	/* another CPU may drop ehci->lock during a schedule scan while
 	 * it reports urb completions.  this flag guards against bogus
 	 * attempts at re-entrant schedule scanning.
@@ -422,10 +384,7 @@
 	 * misplace IRQs, and should let us run completely without IRQs.
 	 * such lossage has been observed on both VT6202 and VT8235.
 	 */
-	if (ehci->rh_state == EHCI_RH_RUNNING &&
-			(ehci->async->qh_next.ptr != NULL ||
-			 ehci->periodic_count != 0))
-		timer_action (ehci, TIMER_IO_WATCHDOG);
+	turn_on_io_watchdog(ehci);
 }
 
 /*
@@ -438,7 +397,6 @@
 	ehci_dbg (ehci, "stop\n");
 
 	/* no more interrupts ... */
-	del_timer_sync (&ehci->watchdog);
 
 	spin_lock_irq(&ehci->lock);
 	ehci->enabled_hrtimer_events = 0;
@@ -490,9 +448,6 @@
 	 * keep io watchdog by default, those good HCDs could turn off it later
 	 */
 	ehci->need_io_watchdog = 1;
-	init_timer(&ehci->watchdog);
-	ehci->watchdog.function = ehci_watchdog;
-	ehci->watchdog.data = (unsigned long) ehci;
 
 	hrtimer_init(&ehci->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 	ehci->hrtimer.function = ehci_hrtimer_func;
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 5d84562..05490d3 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -208,7 +208,6 @@
 
 	if (time_before (jiffies, ehci->next_statechange))
 		msleep(5);
-	del_timer_sync(&ehci->watchdog);
 
 	spin_lock_irq (&ehci->lock);
 
@@ -316,10 +315,6 @@
 	ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 	spin_unlock_irq (&ehci->lock);
 
-	/* ehci_work() may have re-enabled the watchdog timer, which we do not
-	 * want, and so we must delete any pending watchdog timer events.
-	 */
-	del_timer_sync(&ehci->watchdog);
 	hrtimer_cancel(&ehci->hrtimer);
 	return 0;
 }
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index c9c7f7b..9bc39ca 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -970,6 +970,7 @@
 
 	/* Don't start the schedule until ASS is 0 */
 	ehci_poll_ASS(ehci);
+	turn_on_io_watchdog(ehci);
 }
 
 static void disable_async(struct ehci_hcd *ehci)
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 263b542..26ce8fe 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -489,6 +489,7 @@
 
 	/* Don't start the schedule until PSS is 0 */
 	ehci_poll_PSS(ehci);
+	turn_on_io_watchdog(ehci);
 }
 
 static void disable_periodic(struct ehci_hcd *ehci)
@@ -1649,7 +1650,6 @@
 	iso_sched_free (stream, iso_sched);
 	urb->hcpriv = NULL;
 
-	timer_action (ehci, TIMER_IO_WATCHDOG);
 	++ehci->isoc_count;
 	enable_periodic(ehci);
 }
@@ -2052,7 +2052,6 @@
 	iso_sched_free (stream, sched);
 	urb->hcpriv = NULL;
 
-	timer_action (ehci, TIMER_IO_WATCHDOG);
 	++ehci->isoc_count;
 	enable_periodic(ehci);
 }
diff --git a/drivers/usb/host/ehci-timer.c b/drivers/usb/host/ehci-timer.c
index 0e28bae7..eb896a2 100644
--- a/drivers/usb/host/ehci-timer.c
+++ b/drivers/usb/host/ehci-timer.c
@@ -76,6 +76,7 @@
 	10 * NSEC_PER_MSEC,	/* EHCI_HRTIMER_IAA_WATCHDOG */
 	10 * NSEC_PER_MSEC,	/* EHCI_HRTIMER_DISABLE_PERIODIC */
 	15 * NSEC_PER_MSEC,	/* EHCI_HRTIMER_DISABLE_ASYNC */
+	100 * NSEC_PER_MSEC,	/* EHCI_HRTIMER_IO_WATCHDOG */
 };
 
 /* Enable a pending hrtimer event */
@@ -332,6 +333,25 @@
 }
 
 
+/* Enable the I/O watchdog, if appropriate */
+static void turn_on_io_watchdog(struct ehci_hcd *ehci)
+{
+	/* Not needed if the controller isn't running or it's already enabled */
+	if (ehci->rh_state != EHCI_RH_RUNNING ||
+			(ehci->enabled_hrtimer_events &
+				BIT(EHCI_HRTIMER_IO_WATCHDOG)))
+		return;
+
+	/*
+	 * Isochronous transfers always need the watchdog.
+	 * For other sorts we use it only if the flag is set.
+	 */
+	if (ehci->isoc_count > 0 || (ehci->need_io_watchdog &&
+			ehci->async_count + ehci->intr_count > 0))
+		ehci_enable_event(ehci, EHCI_HRTIMER_IO_WATCHDOG, true);
+}
+
+
 /*
  * Handler functions for the hrtimer event types.
  * Keep this array in the same order as the event types indexed by
@@ -347,6 +367,7 @@
 	ehci_iaa_watchdog,		/* EHCI_HRTIMER_IAA_WATCHDOG */
 	ehci_disable_PSE,		/* EHCI_HRTIMER_DISABLE_PERIODIC */
 	ehci_disable_ASE,		/* EHCI_HRTIMER_DISABLE_ASYNC */
+	ehci_work,			/* EHCI_HRTIMER_IO_WATCHDOG */
 };
 
 static enum hrtimer_restart ehci_hrtimer_func(struct hrtimer *t)
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 0863718..254f414 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -88,6 +88,7 @@
 	EHCI_HRTIMER_IAA_WATCHDOG,	/* Handle lost IAA interrupts */
 	EHCI_HRTIMER_DISABLE_PERIODIC,	/* Wait to disable periodic sched */
 	EHCI_HRTIMER_DISABLE_ASYNC,	/* Wait to disable async sched */
+	EHCI_HRTIMER_IO_WATCHDOG,	/* Check for missing IRQs */
 	EHCI_HRTIMER_NUM_EVENTS		/* Must come last */
 };
 #define EHCI_HRTIMER_NO_EVENT	99
@@ -177,8 +178,6 @@
 	struct dma_pool		*itd_pool;	/* itd per iso urb */
 	struct dma_pool		*sitd_pool;	/* sitd per split iso urb */
 
-	struct timer_list	watchdog;
-	unsigned long		actions;
 	unsigned		random_frame;
 	unsigned long		next_statechange;
 	ktime_t			last_periodic_enable;
@@ -235,16 +234,6 @@
 	return container_of ((void *) ehci, struct usb_hcd, hcd_priv);
 }
 
-enum ehci_timer_action {
-	TIMER_IO_WATCHDOG,
-};
-
-static inline void
-timer_action_done (struct ehci_hcd *ehci, enum ehci_timer_action action)
-{
-	clear_bit (action, &ehci->actions);
-}
-
 /*-------------------------------------------------------------------------*/
 
 #include <linux/usb/ehci_def.h>