[Patch v7 01/18] ACPI, irq: fix regression casued by 6b9fb7082409

Jiang Liu
2014-10-27T05:19:29Z

When IOAPIC is disabled, acpi_gsi_to_irq() should return gsi directly
instead of calling mp_map_gsi_to_irq() to translate gsi to IRQ by IOAPIC.
It fixes https://bugzilla.kernel.org/show_bug.cgi?id=84381.

Reported-by: Thomas Richter <thor@math.tu-berlin.de>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: rui.zhang@intel.com
Cc: <stable@vger.kernel.org> # 3.17
---
arch/x86/kernel/acpi/boot.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index b436fc735aa4..eceba9d9e116 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -604,14 +604,19 @@ void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger)

int acpi_gsi_to_irq(u32 gsi, unsigned int *irqp)
{
- int irq = mp_map_gsi_to_irq(gsi, IOAPIC_MAP_ALLOC | IOAPIC_MAP_CHECK);
+ int irq;

- if (irq >= 0) {
+ if (acpi_irq_model == ACPI_IRQ_MODEL_PIC) {
+ *irqp = gsi;
+ } else {
+ irq = mp_map_gsi_to_irq(gsi,
+ IOAPIC_MAP_ALLOC | IOAPIC_MAP_CHECK);
+ if (irq < 0)
+ return -1;
*irqp = irq;
- return 0;
}

- return -1;
+ return 0;
}
EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);

--
1.7.10.4