Remove backend changed accelerator hook

diff -r 7f2237e423b7 drivers/xen/netfront/accel.c
--- a/drivers/xen/netfront/accel.c	Tue Oct 30 13:22:35 2007 +0000
+++ b/drivers/xen/netfront/accel.c	Tue Oct 30 13:23:13 2007 +0000
@@ -813,40 +813,6 @@ void netfront_accelerator_resume(struct 
 }
 
 
-void netfront_accelerator_call_backend_changed(struct netfront_info *np,
-					       struct xenbus_device *dev,
-					       enum xenbus_state backend_state)
-{
-	struct netfront_accel_hooks *hooks;
-	unsigned flags;
-
-	/* 
-	 * Call the backend_changed accelerator hook. The use count
-	 * for the accelerator's hooks is incremented for the duration
-	 * of the call to prevent the accelerator being able to modify
-	 * the hooks in the middle (by, for example, unloading)
-	 */
-	if (np->accel_vif_state.hooks) {
-		spin_lock_irqsave(&np->accelerator->vif_states_lock, flags); 
-		hooks = np->accel_vif_state.hooks;
-		if (hooks) {
-			kref_get(&np->accel_vif_state.vif_kref);
-			spin_unlock_irqrestore
-				(&np->accelerator->vif_states_lock, flags);
-
- 			np->accel_vif_state.hooks->backend_changed
- 				(dev, backend_state);
-
-			kref_put(&np->accel_vif_state.vif_kref,
-				 vif_kref_release);
-		} else {
-			spin_unlock_irqrestore
-				(&np->accelerator->vif_states_lock, flags);
-		}
-	}
-}
-
-
 void netfront_accelerator_call_stop_napi_irq(struct netfront_info *np,
 					     struct net_device *dev)
 {
diff -r 7f2237e423b7 drivers/xen/netfront/netfront.c
--- a/drivers/xen/netfront/netfront.c	Tue Oct 30 13:22:35 2007 +0000
+++ b/drivers/xen/netfront/netfront.c	Tue Oct 30 13:24:00 2007 +0000
@@ -549,8 +549,6 @@ static void backend_changed(struct xenbu
 		xenbus_frontend_closed(dev);
 		break;
 	}
-
-	netfront_accelerator_call_backend_changed(np, dev, backend_state);
 }
 
 /** Send a packet on a net device to encourage switches to learn the
diff -r 7f2237e423b7 drivers/xen/netfront/netfront.h
--- a/drivers/xen/netfront/netfront.h	Tue Oct 30 13:22:35 2007 +0000
+++ b/drivers/xen/netfront/netfront.h	Tue Oct 30 13:23:42 2007 +0000
@@ -63,12 +63,6 @@ struct netfront_accel_hooks {
 	 * remove: Opposite of new_device
 	 */
 	int (*remove)(struct xenbus_device *dev);
-	/* 
-	 * backend_changed: Callback from watch based on backend's
-	 * xenbus state changing
-	 */
-	void (*backend_changed)(struct xenbus_device *dev,
-				enum xenbus_state backend_state);
 	/*
 	 * The net_device is being polled, check the accelerated
 	 * hardware for any pending packets
@@ -287,10 +281,6 @@ void netfront_accelerator_resume(struct 
 void netfront_accelerator_resume(struct netfront_info *np,
 				 struct xenbus_device *dev);
 extern
-void netfront_accelerator_call_backend_changed(struct netfront_info *np,
-					       struct xenbus_device *dev,
-					       enum xenbus_state backend_state);
-extern
 void netfront_accelerator_call_stop_napi_irq(struct netfront_info *np,
 					     struct net_device *dev);
 extern