[PATCH] USB: reject urb submissions to suspended devices

This patch rejects URB submissions to suspended devices, so
that they don't get hardware-specific fault reports.  Instead,
they get the same code (-EHOSTUNREACH) for all HCDs.

It also fixes a minor problem with colliding declarations of
the symbol USB_STATE_SUSPENDED.

drivers/usb/core/hcd-pci.c

@@ -293,7 +293,7 @@ int usb_hcd_pci_suspend (struct pci_dev *dev, u32 state)
 	case USB_STATE_HALT:
 		dev_dbg (hcd->self.controller, "halted; hcd not suspended\n");
 		break;
-	case USB_STATE_SUSPENDED:
+	case HCD_STATE_SUSPENDED:
 		dev_dbg (hcd->self.controller, "hcd already suspended\n");
 		break;
 	default:
@@ -310,7 +310,7 @@ int usb_hcd_pci_suspend (struct pci_dev *dev, u32 state)
 					"suspend fail, retval %d\n",
 					retval);
 		else
-			hcd->state = USB_STATE_SUSPENDED;
+			hcd->state = HCD_STATE_SUSPENDED;
 	}
 
  	pci_set_power_state (dev, state);
@@ -333,7 +333,7 @@ int usb_hcd_pci_resume (struct pci_dev *dev)
 	dev_dbg (hcd->self.controller, "resume from state D%d\n",
 			dev->current_state);
 
-	if (hcd->state != USB_STATE_SUSPENDED) {
+	if (hcd->state != HCD_STATE_SUSPENDED) {
 		dev_dbg (hcd->self.controller, 
 				"can't resume, not suspended!\n");
 		return -EL3HLT;

drivers/usb/core/hcd.h

@@ -96,7 +96,7 @@ struct usb_hcd {	/* usb_bus.hcpriv points to this */
 #	define	USB_STATE_RUNNING	(__ACTIVE)
 #	define	USB_STATE_QUIESCING	(__SUSPEND|__TRANSIENT|__ACTIVE)
 #	define	USB_STATE_RESUMING	(__SUSPEND|__TRANSIENT)
-#	define	USB_STATE_SUSPENDED	(__SUSPEND)
+#	define	HCD_STATE_SUSPENDED	(__SUSPEND)
 
 #define	HCD_IS_RUNNING(state) ((state) & __ACTIVE)
 #define	HCD_IS_SUSPENDED(state) ((state) & __SUSPEND)

drivers/usb/core/urb.c

@@ -237,6 +237,8 @@ int usb_submit_urb(struct urb *urb, int mem_flags)
 	    (dev->state < USB_STATE_DEFAULT) ||
 	    (!dev->bus) || (dev->devnum <= 0))
 		return -ENODEV;
+	if (dev->state == USB_STATE_SUSPENDED)
+		return -EHOSTUNREACH;
 	if (!(op = dev->bus->op) || !op->submit_urb)
 		return -ENODEV;