USB: EHCI: remove unneeded suspend/resume code

This patch (as1566) removes the code in ehci-hcd's resume routines
which tries to restart or cancel any transfers left active while the
root hub or controller was asleep.  This code isn't necessary, because
all URBs are terminated before the root hub is suspended.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-hcd.c

@@ -1312,13 +1312,6 @@ static int __maybe_unused ehci_resume(struct usb_hcd *hcd, bool hibernated)
 	(void) ehci_halt(ehci);
 	(void) ehci_reset(ehci);
 
-	/* emptying the schedule aborts any urbs */
-	spin_lock_irq(&ehci->lock);
-	if (ehci->reclaim)
-		end_unlink_async(ehci);
-	ehci_work(ehci);
-	spin_unlock_irq(&ehci->lock);
-
 	ehci_writel(ehci, ehci->command, &ehci->regs->command);
 	ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 	ehci_readl(ehci, &ehci->regs->command);	/* unblock posted writes */

drivers/usb/host/ehci-hub.c

@@ -424,23 +424,12 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
 			ehci_vdbg (ehci, "resumed port %d\n", i + 1);
 		}
 	}
-	(void) ehci_readl(ehci, &ehci->regs->command);
-
-	/* maybe re-activate the schedule(s) */
-	temp = 0;
-	if (ehci->async->qh_next.qh)
-		temp |= CMD_ASE;
-	if (ehci->periodic_sched)
-		temp |= CMD_PSE;
-	if (temp) {
-		ehci->command |= temp;
-		ehci_writel(ehci, ehci->command, &ehci->regs->command);
-	}
 
 	ehci->next_statechange = jiffies + msecs_to_jiffies(5);
 
 	/* Now we can safely re-enable irqs */
 	ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
+	(void) ehci_readl(ehci, &ehci->regs->intr_enable);
 
 	spin_unlock_irq (&ehci->lock);
 	ehci_handover_companion_ports(ehci);