diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c
index b52d329..0f4e8138 100644
--- a/arch/ia64/sn/kernel/irq.c
+++ b/arch/ia64/sn/kernel/irq.c
@@ -82,20 +82,9 @@
 	nasid = get_nasid();
 	event_occurred =
 	    HUB_L((uint64_t *) GLOBAL_MMR_ADDR(nasid, SH_EVENT_OCCURRED));
-	if (event_occurred & SH_EVENT_OCCURRED_UART_INT_MASK) {
-		mask |= (1 << SH_EVENT_OCCURRED_UART_INT_SHFT);
-	}
-	if (event_occurred & SH_EVENT_OCCURRED_IPI_INT_MASK) {
-		mask |= (1 << SH_EVENT_OCCURRED_IPI_INT_SHFT);
-	}
-	if (event_occurred & SH_EVENT_OCCURRED_II_INT0_MASK) {
-		mask |= (1 << SH_EVENT_OCCURRED_II_INT0_SHFT);
-	}
-	if (event_occurred & SH_EVENT_OCCURRED_II_INT1_MASK) {
-		mask |= (1 << SH_EVENT_OCCURRED_II_INT1_SHFT);
-	}
+	mask = event_occurred & SH_ALL_INT_MASK;
 	HUB_S((uint64_t *) GLOBAL_MMR_ADDR(nasid, SH_EVENT_OCCURRED_ALIAS),
-	      mask);
+		 mask);
 	__set_bit(irq, (volatile void *)pda->sn_in_service_ivecs);
 
 	move_irq(irq);
diff --git a/include/asm-ia64/sn/shub_mmr.h b/include/asm-ia64/sn/shub_mmr.h
index 5c2fcf1..6ec37e8 100644
--- a/include/asm-ia64/sn/shub_mmr.h
+++ b/include/asm-ia64/sn/shub_mmr.h
@@ -129,6 +129,23 @@
 #define SH_EVENT_OCCURRED_II_INT1_SHFT           30
 #define SH_EVENT_OCCURRED_II_INT1_MASK           0x0000000040000000
 
+/*   SH2_EVENT_OCCURRED_EXTIO_INT2                                      */
+/*   Description:  Pending SHUB 2 EXT IO INT2                           */
+#define SH2_EVENT_OCCURRED_EXTIO_INT2_SHFT       33
+#define SH2_EVENT_OCCURRED_EXTIO_INT2_MASK       0x0000000200000000
+
+/*   SH2_EVENT_OCCURRED_EXTIO_INT3                                      */
+/*   Description:  Pending SHUB 2 EXT IO INT3                           */
+#define SH2_EVENT_OCCURRED_EXTIO_INT3_SHFT       34
+#define SH2_EVENT_OCCURRED_EXTIO_INT3_MASK       0x0000000400000000
+
+#define SH_ALL_INT_MASK \
+	(SH_EVENT_OCCURRED_UART_INT_MASK | SH_EVENT_OCCURRED_IPI_INT_MASK | \
+	 SH_EVENT_OCCURRED_II_INT0_MASK | SH_EVENT_OCCURRED_II_INT1_MASK | \
+	 SH_EVENT_OCCURRED_II_INT1_MASK | SH2_EVENT_OCCURRED_EXTIO_INT2_MASK | \
+	 SH2_EVENT_OCCURRED_EXTIO_INT3_MASK)
+
+
 /* ==================================================================== */
 /*                         LEDS                                         */
 /* ==================================================================== */