diff options
| author | John Keller <jpk@sgi.com> | 2008-12-08 11:44:11 -0600 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2008-12-09 10:57:18 -0800 |
| commit | ff740fb02146c83d96def1b897ed232b4e0fbcfd (patch) | |
| tree | c4f956781a660d4a16114d899fa0f4a2bb08a5c6 /arch/ia64/sn/kernel/irq.c | |
| parent | 3c0db899bff2acbf1b36c65763de4d0133910104 (diff) | |
| download | linux-rt-ff740fb02146c83d96def1b897ed232b4e0fbcfd.tar.gz | |
[IA64] SN: prevent IRQ retargetting in request_irq()
With the introduction of the generic affinity autoselector,
irq_select_affinity(), IRQs are now being retargetted,
using a default mask, via the request_irq() path.
This results in all IRQs targetted at CPU 0.
SN Altix assigns affinity in the SN PROM, and does not
expect that to be changed as part of request_irq().
Set the IRQ_AFFINITY_SET flag to prevent
request_irq() from resetting affinity.
Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/sn/kernel/irq.c')
| -rw-r--r-- | arch/ia64/sn/kernel/irq.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c index 96c31b4180c3..0c66dbdd1d72 100644 --- 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 } |