Merge remote-tracking branch 'stable/linux-4.1.y' into rpi-4.1.y
[projects/modsched/linux.git] / drivers / usb / core / hub.c
index acf746b..f2f453c 100644 (file)
@@ -1034,10 +1034,20 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
        unsigned delay;
 
        /* Continue a partial initialization */
-       if (type == HUB_INIT2)
-               goto init2;
-       if (type == HUB_INIT3)
+       if (type == HUB_INIT2 || type == HUB_INIT3) {
+               device_lock(hub->intfdev);
+
+               /* Was the hub disconnected while we were waiting? */
+               if (hub->disconnected) {
+                       device_unlock(hub->intfdev);
+                       kref_put(&hub->kref, hub_release);
+                       return;
+               }
+               if (type == HUB_INIT2)
+                       goto init2;
                goto init3;
+       }
+       kref_get(&hub->kref);
 
        /* The superspeed hub except for root hub has to use Hub Depth
         * value as an offset into the route string to locate the bits
@@ -1235,6 +1245,7 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
                        queue_delayed_work(system_power_efficient_wq,
                                        &hub->init_work,
                                        msecs_to_jiffies(delay));
+                       device_unlock(hub->intfdev);
                        return;         /* Continues at init3: below */
                } else {
                        msleep(delay);
@@ -1256,6 +1267,11 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
        /* Allow autosuspend if it was suppressed */
        if (type <= HUB_INIT3)
                usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
+
+       if (type == HUB_INIT2 || type == HUB_INIT3)
+               device_unlock(hub->intfdev);
+
+       kref_put(&hub->kref, hub_release);
 }
 
 /* Implement the continuations for the delays above */