From b328c1cbac55d6ed9ab4708611e20961a28f27f1 Mon Sep 17 00:00:00 2001
From: chenchaoqun <chenchaoqun@rt-thread.com>
Date: Mon, 27 Jul 2020 11:36:57 +0800
Subject: [PATCH] [modify] if ... else if constructs to be terminated with an
 else clause, which other option is invalid and delete surplus space.

---
 src/ipc.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/ipc.c b/src/ipc.c
index 8e8c4db842..876d8df3a1 100644
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -1080,6 +1080,13 @@ rt_err_t rt_event_send(rt_event_t event, rt_uint32_t set)
                     status = RT_EOK;
                 }
             }
+            else
+            {
+                /* enable interrupt */
+                rt_hw_interrupt_enable(level);
+
+                return -RT_EINVAL;
+            }
 
             /* move node to the next */
             n = n->next;
@@ -1186,10 +1193,10 @@ rt_err_t rt_event_recv(rt_event_t   event,
     {
         /* no waiting */
         thread->error = -RT_ETIMEOUT;
-        
+
         /* enable interrupt */
         rt_hw_interrupt_enable(level);
-        
+
         return -RT_ETIMEOUT;
     }
     else