diff --git a/post/lib_ppc/cr.c b/post/lib_ppc/cr.c
index 0bd9e74..2c7976a 100644
--- a/post/lib_ppc/cr.c
+++ b/post/lib_ppc/cr.c
@@ -248,6 +248,7 @@
     int ret = 0;
     unsigned int i;
     unsigned long cr_sav;
+    int flag = disable_interrupts();
 
     asm ( "mfcr %0" : "=r" (cr_sav) : );
 
@@ -347,6 +348,9 @@
 
     asm ( "mtcr %0" : : "r" (cr_sav));
 
+    if (flag)
+	enable_interrupts();
+
     return ret;
 }