diff --git a/kernel/proc.c b/kernel/proc.c
index b880fd4..57528f9 100644
--- a/kernel/proc.c
+++ b/kernel/proc.c
@@ -418,12 +418,12 @@ scheduler(void)
 {
   struct proc *p;
   struct cpu *c = mycpu();
-
-  // Let devices interrupt when no lock is held.
-  intr_on();
   
   c->proc = 0;
   for(;;){
+    // Let devices interrupt when no lock is held.
+    intr_on();
+
     for(p = proc; p < &proc[NPROC]; p++) {
       acquire(&p->lock);
       if(p->state == RUNNABLE) {