--- xinu/sys/chprio.c	2018/04/24 17:39:04	1.1.1.1
+++ xinu/sys/chprio.c	2018/04/24 17:40:08	1.1.1.2
@@ -14,24 +14,19 @@ SYSCALL chprio(pid,newprio)
 {
 	int	oldprio;
 	struct	pentry	*pptr;
-        PStype  ps;
 
-	disable(ps);
+	disable();
 	if (isbadpid(pid) || newprio<=0 ||
 	    (pptr = &proctab[pid])->pstate == PRFREE) {
-		restore(ps);
+		restore();
 		return(SYSERR);
 	}
 	oldprio = pptr->pprio;
 	pptr->pprio = newprio;
-	switch (pptr->pstate) {
-	case PRREADY:
-		insert( dequeue(pid), rdyhead, newprio);
-	case PRCURR:
-		resched();
-	default:
-		break;
-	}
-	restore(ps);
+	if (pptr->pstate == PRREADY) {
+		dequeue(pid);
+		insert(pid, rdyhead, newprio);
+	} 
+	restore();
 	return(oldprio);
 }