diff --git a/[refs] b/[refs]
index 4e9dae719b3d..2521e9ff4623 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1ab082d7cbd0f34e39a5396cc6340c00bc5d66ef
+refs/heads/master: 30c404699dd650f213d480d263c775915a0e1297
diff --git a/trunk/arch/powerpc/sysdev/ipic.c b/trunk/arch/powerpc/sysdev/ipic.c
index 9a89cd3e80a2..a86d3ce01ead 100644
--- a/trunk/arch/powerpc/sysdev/ipic.c
+++ b/trunk/arch/powerpc/sysdev/ipic.c
@@ -568,8 +568,7 @@ static void ipic_ack_irq(unsigned int virq)
 
 	spin_lock_irqsave(&ipic_lock, flags);
 
-	temp = ipic_read(ipic->regs, ipic_info[src].ack);
-	temp |= (1 << (31 - ipic_info[src].bit));
+	temp = 1 << (31 - ipic_info[src].bit);
 	ipic_write(ipic->regs, ipic_info[src].ack, temp);
 
 	/* mb() can't guarantee that ack is finished.  But it does finish
@@ -592,8 +591,7 @@ static void ipic_mask_irq_and_ack(unsigned int virq)
 	temp &= ~(1 << (31 - ipic_info[src].bit));
 	ipic_write(ipic->regs, ipic_info[src].mask, temp);
 
-	temp = ipic_read(ipic->regs, ipic_info[src].ack);
-	temp |= (1 << (31 - ipic_info[src].bit));
+	temp = 1 << (31 - ipic_info[src].bit);
 	ipic_write(ipic->regs, ipic_info[src].ack, temp);
 
 	/* mb() can't guarantee that ack is finished.  But it does finish