uwb: safely remove all reservations

When removing all reservations during shutdown, terminate them first and
then wait for any pending timeout work to complete.  This prevents the
timeout work from running after the reservation has been freed.
Signed-off-by: David Vrabel <david.vrabel@csr.com>

drivers/uwb/rsv.c

@@ -114,7 +114,8 @@ void uwb_rsv_dump(char *text, struct uwb_rsv *rsv)
 		devaddr = rsv->target.devaddr;
 	uwb_dev_addr_print(target, sizeof(target), &devaddr);
 
-	dev_dbg(dev, "rsv %s -> %s: %s\n", owner, target, uwb_rsv_state_str(rsv->state));
+	dev_dbg(dev, "rsv %s %s -> %s: %s\n",
+		text, owner, target, uwb_rsv_state_str(rsv->state));
 }
 
 static void uwb_rsv_release(struct kref *kref)
@@ -511,8 +512,7 @@ void uwb_rsv_remove(struct uwb_rsv *rsv)
 
 	if (uwb_rsv_is_owner(rsv))
 		uwb_rsv_put_stream(rsv);
-	
-	del_timer_sync(&rsv->timer);
+
 	uwb_dev_put(rsv->owner);
 	if (rsv->target.type == UWB_RSV_TARGET_DEV)
 		uwb_dev_put(rsv->target.dev);
@@ -943,13 +943,22 @@ void uwb_rsv_remove_all(struct uwb_rc *rc)
 
 	mutex_lock(&rc->rsvs_mutex);
 	list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) {
-		uwb_rsv_remove(rsv);
+		if (rsv->state != UWB_RSV_STATE_NONE)
+			uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
+		del_timer_sync(&rsv->timer);
 	}
 	/* Cancel any postponed update. */
 	rc->set_drp_ie_pending = 0;
 	mutex_unlock(&rc->rsvs_mutex);
 
 	cancel_delayed_work_sync(&rc->rsv_update_work);
+	flush_workqueue(rc->rsv_workq);
+
+	mutex_lock(&rc->rsvs_mutex);
+	list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) {
+		uwb_rsv_remove(rsv);
+	}
+	mutex_unlock(&rc->rsvs_mutex);
 }
 
 void uwb_rsv_init(struct uwb_rc *rc)