diff --git a/hw/input/pckbd.c b/hw/input/pckbd.c
index dde85ba6c6..90b33954a8 100644
--- a/hw/input/pckbd.c
+++ b/hw/input/pckbd.c
@@ -148,15 +148,34 @@ typedef struct KBDState {
     hwaddr mask;
 } KBDState;
 
-/* update irq and KBD_STAT_[MOUSE_]OBF */
 /* XXX: not generating the irqs if KBD_MODE_DISABLE_KBD is set may be
    incorrect, but it avoids having to simulate exact delays */
-static void kbd_update_irq(KBDState *s)
+static void kbd_update_irq_lines(KBDState *s)
 {
     int irq_kbd_level, irq_mouse_level;
 
     irq_kbd_level = 0;
     irq_mouse_level = 0;
+
+    if (s->status & KBD_STAT_OBF) {
+        if (s->status & KBD_STAT_MOUSE_OBF) {
+            if (s->mode & KBD_MODE_MOUSE_INT) {
+                irq_mouse_level = 1;
+            }
+        } else {
+            if ((s->mode & KBD_MODE_KBD_INT) &&
+                !(s->mode & KBD_MODE_DISABLE_KBD)) {
+                irq_kbd_level = 1;
+            }
+        }
+    }
+    qemu_set_irq(s->irq_kbd, irq_kbd_level);
+    qemu_set_irq(s->irq_mouse, irq_mouse_level);
+}
+
+/* update irq and KBD_STAT_[MOUSE_]OBF */
+static void kbd_update_irq(KBDState *s)
+{
     s->status &= ~(KBD_STAT_OBF | KBD_STAT_MOUSE_OBF);
     s->outport &= ~(KBD_OUT_OBF | KBD_OUT_MOUSE_OBF);
     if (s->pending) {
@@ -166,16 +185,9 @@ static void kbd_update_irq(KBDState *s)
         if (s->pending == KBD_PENDING_AUX) {
             s->status |= KBD_STAT_MOUSE_OBF;
             s->outport |= KBD_OUT_MOUSE_OBF;
-            if (s->mode & KBD_MODE_MOUSE_INT)
-                irq_mouse_level = 1;
-        } else {
-            if ((s->mode & KBD_MODE_KBD_INT) &&
-                !(s->mode & KBD_MODE_DISABLE_KBD))
-                irq_kbd_level = 1;
         }
     }
-    qemu_set_irq(s->irq_kbd, irq_kbd_level);
-    qemu_set_irq(s->irq_mouse, irq_mouse_level);
+    kbd_update_irq_lines(s);
 }
 
 static void kbd_update_kbd_irq(void *opaque, int level)