X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flib%2Fkernel%2Flist.c;h=ba4fae68bfe51919dc30a43007f634c2fa8d0474;hb=101845b2c3153f417f90e1c2809154187bfc9e54;hp=173557680184707306e5c2816a564a550ef79f8a;hpb=1ac0d8727039aca3668d93c24aea3a558494b371;p=pintos-anon

diff --git a/src/lib/kernel/list.c b/src/lib/kernel/list.c
index 1735576..ba4fae6 100644
--- a/src/lib/kernel/list.c
+++ b/src/lib/kernel/list.c
@@ -232,8 +232,9 @@ list_remove (list_elem *elem)
 list_elem *
 list_pop_front (struct list *list)
 {
-  ASSERT (list != NULL);
-  return list_remove (list_front (list));
+  list_elem *front = list_front (list);
+  list_remove (front);
+  return front;
 }
 
 /* Removes the back element from LIST and returns it.
@@ -241,8 +242,9 @@ list_pop_front (struct list *list)
 list_elem *
 list_pop_back (struct list *list)
 {
-  ASSERT (list != NULL);
-  return list_remove (list_back (list));
+  list_elem *back = list_back (list);
+  list_remove (back);
+  return back;
 }
 
 /* Returns the front element in LIST.