From 7882e42c614c24a1750cba4a3e2936b6bf68f42f Mon Sep 17 00:00:00 2001
From: hipeanut <109409810+hipeanut@users.noreply.github.com>
Date: Tue, 2 Aug 2022 11:18:17 +0800
Subject: [PATCH] [bsp/raspi3-32] fix some bug of funtion '__rt_ffs' (#6187)

* [bsp/raspi3-32] fix some bug of funtion '__rt_ffs'

* Update trap.c

Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>
---
 bsp/raspberry-pi/raspi3-32/cpu/trap.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
 mode change 100644 => 100755 bsp/raspberry-pi/raspi3-32/cpu/trap.c

diff --git a/bsp/raspberry-pi/raspi3-32/cpu/trap.c b/bsp/raspberry-pi/raspi3-32/cpu/trap.c
old mode 100644
new mode 100755
index c4d0d08e1a..26893e2a49
--- a/bsp/raspberry-pi/raspi3-32/cpu/trap.c
+++ b/bsp/raspberry-pi/raspi3-32/cpu/trap.c
@@ -133,7 +133,12 @@ void rt_hw_trap_resv(struct rt_hw_exp_stack *regs)
 #ifdef RT_USING_CPU_FFS
 int __rt_ffs(int value)
 {
-    int num = 0;
+    if (!value)
+    {
+        return 0;
+    }
+
+    int num = 1;
 
     if ((value & 0xffff) == 0)
     {