[IA64] SN: prevent IRQ retargetting in request_irq()

[linux-2.6-omap-h63xx.git] / arch / ia64 / sn / kernel / irq.c

diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c
index 96c31b4180c349b00b400c73daf670227f957051..0c66dbdd1d728d0cd826b865a0d0ffe0cdd8b2cc 100644 (file)
--- a/arch/ia64/sn/kernel/irq.c
+++ b/arch/ia64/sn/kernel/irq.c
@@ -5,7 +5,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (c) 2000-2007 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (c) 2000-2008 Silicon Graphics, Inc.  All Rights Reserved.
  */
 
 #include <linux/irq.h>
@@ -375,6 +375,7 @@ void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
        int cpu = nasid_slice_to_cpuid(nasid, slice);
 #ifdef CONFIG_SMP
        int cpuphys;
+       irq_desc_t *desc;
 #endif
 
        pci_dev_get(pci_dev);
@@ -391,6 +392,12 @@ void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
 #ifdef CONFIG_SMP
        cpuphys = cpu_physical_id(cpu);
        set_irq_affinity_info(sn_irq_info->irq_irq, cpuphys, 0);
+       desc = irq_to_desc(sn_irq_info->irq_irq);
+       /*
+        * Affinity was set by the PROM, prevent it from
+        * being reset by the request_irq() path.
+        */
+       desc->status |= IRQ_AFFINITY_SET;
 #endif
 }