From a6959a9ef8a8b3233a2d0b395d43f07711bf765c Mon Sep 17 00:00:00 2001
From: geniusgogo <2041245+geniusgogo@users.noreply.github.com>
Date: Sat, 12 Aug 2023 10:50:45 +0800
Subject: [PATCH] fix lwp_free tty switch to foreground error (#7945)

---
 components/lwp/lwp_pid.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/components/lwp/lwp_pid.c b/components/lwp/lwp_pid.c
index 79f4e2ec0f..38d068ee0a 100644
--- a/components/lwp/lwp_pid.c
+++ b/components/lwp/lwp_pid.c
@@ -469,13 +469,18 @@ void lwp_free(struct rt_lwp* lwp)
         if (lwp->tty != RT_NULL)
         {
             rt_mutex_take(&lwp->tty->lock, RT_WAITING_FOREVER);
-            old_lwp = tty_pop(&lwp->tty->head, RT_NULL);
-            rt_mutex_release(&lwp->tty->lock);
             if (lwp->tty->foreground == lwp)
             {
+                old_lwp = tty_pop(&lwp->tty->head, RT_NULL);
                 lwp->tty->foreground = old_lwp;
-                lwp->tty = RT_NULL;
             }
+            else
+            {
+                tty_pop(&lwp->tty->head, lwp);
+            }
+            rt_mutex_release(&lwp->tty->lock);
+
+            lwp->tty = RT_NULL;
         }
     }
     else