From 5a7b3ff4670be3330842558dc5ae46ec3fc448e5 Mon Sep 17 00:00:00 2001
From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Wed, 9 Nov 2005 15:07:16 +1100
Subject: ppc64: allow iSeries to use IRQSTACKS again
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
arch/powerpc/platforms/iseries/irq.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/iseries/irq.c b/arch/powerpc/platforms/iseries/irq.c
index a06603d84a4..a0ff7d95fdf 100644
--- a/arch/powerpc/platforms/iseries/irq.c
+++ b/arch/powerpc/platforms/iseries/irq.c
@@ -103,6 +103,9 @@ static void intReceived(struct XmPciLpEvent *eventParm,
struct pt_regs *regsParm)
{
int irq;
+#ifdef CONFIG_IRQSTACKS
+ struct thread_info *curtp, *irqtp;
+#endif
++Pci_Interrupt_Count;
@@ -110,7 +113,20 @@ static void intReceived(struct XmPciLpEvent *eventParm,
case XmPciLpEvent_SlotInterrupt:
irq = eventParm->hvLpEvent.xCorrelationToken;
/* Dispatch the interrupt handlers for this irq */
- ppc_irq_dispatch_handler(regsParm, irq);
+#ifdef CONFIG_IRQSTACKS
+ /* Switch to the irq stack to handle this */
+ curtp = current_thread_info();
+ irqtp = hardirq_ctx[smp_processor_id()];
+ if (curtp != irqtp) {
+ irqtp->task = curtp->task;
+ irqtp->flags = 0;
+ call_ppc_irq_dispatch_handler(regsParm, irq, irqtp);
+ irqtp->task = NULL;
+ if (irqtp->flags)
+ set_bits(irqtp->flags, &curtp->flags);
+ } else
+#endif
+ ppc_irq_dispatch_handler(regsParm, irq);
HvCallPci_eoi(eventParm->eventData.slotInterrupt.busNumber,
eventParm->eventData.slotInterrupt.subBusNumber,
eventParm->eventData.slotInterrupt.deviceId);
--
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