[PATCH v3 7/9] ipic: clean up unsupported ack operations

[Li Yang <leoli@freescale.com>]

IPIC controller doesn't support ack operations.  The pending registers
are read-only.  The patch removes ack operations which are not needed.

Signed-off-by: Li Yang <leoli@freescale.com>
---
 arch/powerpc/sysdev/ipic.c |   40 ++--------------------------------------
 1 files changed, 2 insertions(+), 38 deletions(-)

diff --git a/arch/powerpc/sysdev/ipic.c b/arch/powerpc/sysdev/ipic.c
index cd8590d..6835c15 100644
--- a/arch/powerpc/sysdev/ipic.c
+++ b/arch/powerpc/sysdev/ipic.c
@@ -533,42 +533,7 @@ static void ipic_mask_irq(unsigned int virq)
 	temp = ipic_read(ipic->regs, ipic_info[src].mask);
 	temp &= ~(1 << (31 - ipic_info[src].bit));
 	ipic_write(ipic->regs, ipic_info[src].mask, temp);
-
-	spin_unlock_irqrestore(&ipic_lock, flags);
-}
-
-static void ipic_ack_irq(unsigned int virq)
-{
-	struct ipic *ipic = ipic_from_irq(virq);
-	unsigned int src = ipic_irq_to_hw(virq);
-	unsigned long flags;
-	u32 temp;
-
-	spin_lock_irqsave(&ipic_lock, flags);
-
-	temp = ipic_read(ipic->regs, ipic_info[src].pend);
-	temp |= (1 << (31 - ipic_info[src].bit));
-	ipic_write(ipic->regs, ipic_info[src].pend, temp);
-
-	spin_unlock_irqrestore(&ipic_lock, flags);
-}
-
-static void ipic_mask_irq_and_ack(unsigned int virq)
-{
-	struct ipic *ipic = ipic_from_irq(virq);
-	unsigned int src = ipic_irq_to_hw(virq);
-	unsigned long flags;
-	u32 temp;
-
-	spin_lock_irqsave(&ipic_lock, flags);
-
-	temp = ipic_read(ipic->regs, ipic_info[src].mask);
-	temp &= ~(1 << (31 - ipic_info[src].bit));
-	ipic_write(ipic->regs, ipic_info[src].mask, temp);
-
-	temp = ipic_read(ipic->regs, ipic_info[src].pend);
-	temp |= (1 << (31 - ipic_info[src].bit));
-	ipic_write(ipic->regs, ipic_info[src].pend, temp);
+	mb();
 
 	spin_unlock_irqrestore(&ipic_lock, flags);
 }
@@ -626,8 +591,7 @@ static struct irq_chip ipic_irq_chip = {
 	.typename	= " IPIC  ",
 	.unmask		= ipic_unmask_irq,
 	.mask		= ipic_mask_irq,
-	.mask_ack	= ipic_mask_irq_and_ack,
-	.ack		= ipic_ack_irq,
+	.mask_ack	= ipic_mask_irq,
 	.set_type	= ipic_set_irq_type,
 };
 
-- 
1.5.3.2.104.g41ef