[SUNGEM]: Fix NAPI regression with reset work

sungem's gem_reset_task() will unconditionally try to disable NAPI even
when it's called while the interface is not operating and hence the NAPI
struct isn't enabled. Make napi_disable() depend on gp->running.

Also removes a superfluous test of gp->running in the same function.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/net/sungem.c

@@ -2281,14 +2281,12 @@ static void gem_reset_task(struct work_struct *work)
 
 	mutex_lock(&gp->pm_mutex);
 
-	napi_disable(&gp->napi);
+	if (gp->opened)
+		napi_disable(&gp->napi);
 
 	spin_lock_irq(&gp->lock);
 	spin_lock(&gp->tx_lock);
 
-	if (gp->running == 0)
-		goto not_running;
-
 	if (gp->running) {
 		netif_stop_queue(gp->dev);
 
@@ -2298,13 +2296,14 @@ static void gem_reset_task(struct work_struct *work)
 			gem_set_link_modes(gp);
 		netif_wake_queue(gp->dev);
 	}
- not_running:
+
 	gp->reset_task_pending = 0;
 
 	spin_unlock(&gp->tx_lock);
 	spin_unlock_irq(&gp->lock);
 
-	napi_enable(&gp->napi);
+	if (gp->opened)
+		napi_enable(&gp->napi);
 
 	mutex_unlock(&gp->pm_mutex);
 }