[PATCH] USB: OHCI cleanups

This splits out a few obvious fixes, to help shrink a PM patch:

  - when the HC is quiescing, don't schedule any more EDs
    or re-activate any after unlink completion.

  - when the HC is suspended, don't access registers through
    sysfs either.

  - simplify locking and call for donelist processing

drivers/usb/host/ohci-dbg.c

@@ -617,7 +617,17 @@ show_registers (struct class_device *class_dev, char *buf)
 	/* dump driver info, then registers in spec order */
 
 	ohci_dbg_sw (ohci, &next, &size,
-		"%s version " DRIVER_VERSION "\n", hcd_name);
+		"bus %s, device %s\n"
+		"%s version " DRIVER_VERSION "\n",
+		hcd->self.controller->bus->name,
+		hcd->self.controller->bus_id,
+		hcd_name);
+
+	if (bus->controller->power.power_state) {
+		size -= scnprintf (next, size,
+			"SUSPENDED (no register access)\n");
+		goto done;
+	}
 
 	ohci_dump_status(ohci, &next, &size);
 
@@ -657,8 +667,8 @@ show_registers (struct class_device *class_dev, char *buf)
 	/* roothub */
 	ohci_dump_roothub (ohci, 1, &next, &size);
 
+done:
 	spin_unlock_irqrestore (&ohci->lock, flags);
-
 	return PAGE_SIZE - size;
 }
 static CLASS_DEVICE_ATTR (registers, S_IRUGO, show_registers, NULL);

drivers/usb/host/ohci-hcd.c

@@ -615,7 +615,9 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd, struct pt_regs *ptregs)
 	if (ints & OHCI_INTR_WDH) {
 		if (HCD_IS_RUNNING(hcd->state))
 			writel (OHCI_INTR_WDH, &regs->intrdisable);	
-		dl_done_list (ohci, dl_reverse_done_list (ohci), ptregs);
+		spin_lock (&ohci->lock);
+		dl_done_list (ohci, ptregs);
+		spin_unlock (&ohci->lock);
 		if (HCD_IS_RUNNING(hcd->state))
 			writel (OHCI_INTR_WDH, &regs->intrenable); 
 	}

drivers/usb/host/ohci-pci.c

@@ -281,6 +281,11 @@ static int ohci_pci_resume (struct usb_hcd *hcd)
 
 		writel (OHCI_INTR_WDH, &ohci->regs->intrdisable);	
 		(void) readl (&ohci->regs->intrdisable);
+
+		/* Check for a pending done list */
+		if (ohci->hcca->done_head)
+			dl_done_list (ohci, NULL);
+
 		spin_unlock_irq (&ohci->lock);
 
 #ifdef CONFIG_PMAC_PBOOK
@@ -288,9 +293,6 @@ static int ohci_pci_resume (struct usb_hcd *hcd)
 			enable_irq (to_pci_dev(hcd->self.controller)->irq);
 #endif
 
-		/* Check for a pending done list */
-		if (ohci->hcca->done_head)
-			dl_done_list (ohci, dl_reverse_done_list (ohci), NULL);
 		writel (OHCI_INTR_WDH, &ohci->regs->intrenable); 
 
 		/* assume there are TDs on the bulk and control lists */

drivers/usb/host/ohci-q.c

@@ -170,6 +170,9 @@ static int ed_schedule (struct ohci_hcd *ohci, struct ed *ed)
 {	 
 	int	branch;
 
+	if (ohci->hcd.state == USB_STATE_QUIESCING)
+		return -EAGAIN;
+
 	ed->state = ED_OPER;
 	ed->ed_prev = 0;
 	ed->ed_next = 0;
@@ -867,9 +870,6 @@ static struct td *dl_reverse_done_list (struct ohci_hcd *ohci)
 	u32		td_dma;
 	struct td	*td_rev = NULL;
 	struct td	*td = NULL;
-  	unsigned long	flags;
-
-  	spin_lock_irqsave (&ohci->lock, flags);
 
 	td_dma = le32_to_cpup (&ohci->hcca->done_head);
 	ohci->hcca->done_head = 0;
@@ -901,7 +901,6 @@ static struct td *dl_reverse_done_list (struct ohci_hcd *ohci)
 		td_rev = td;
 		td_dma = le32_to_cpup (&td->hwNextTD);
 	}	
-	spin_unlock_irqrestore (&ohci->lock, flags);
 	return td_rev;
 }
 
@@ -1015,7 +1014,9 @@ finish_unlinks (struct ohci_hcd *ohci, u16 tick, struct pt_regs *regs)
    	}
 
 	/* maybe reenable control and bulk lists */ 
-	if (HCD_IS_RUNNING(ohci->hcd.state) && !ohci->ed_rm_list) {
+	if (HCD_IS_RUNNING(ohci->hcd.state)
+			&& ohci->hcd.state != USB_STATE_QUIESCING
+			&& !ohci->ed_rm_list) {
 		u32	command = 0, control = 0;
 
 		if (ohci->ed_controltail) {
@@ -1055,11 +1056,10 @@ finish_unlinks (struct ohci_hcd *ohci, u16 tick, struct pt_regs *regs)
  * scanning the (re-reversed) donelist as this does.
  */
 static void
-dl_done_list (struct ohci_hcd *ohci, struct td *td, struct pt_regs *regs)
+dl_done_list (struct ohci_hcd *ohci, struct pt_regs *regs)
 {
-	unsigned long	flags;
+	struct td	*td = dl_reverse_done_list (ohci);
 
-  	spin_lock_irqsave (&ohci->lock, flags);
   	while (td) {
 		struct td	*td_next = td->next_dl_td;
 		struct urb	*urb = td->urb;
@@ -1100,5 +1100,4 @@ dl_done_list (struct ohci_hcd *ohci, struct td *td, struct pt_regs *regs)
 
     		td = td_next;
   	}  
-	spin_unlock_irqrestore (&ohci->lock, flags);
 }