[Patch v8 01/18] x86: ACPI: Do not translate GSI number if IOAPIC is disabled

From: Jiang Liu
Date: Sun Nov 02 2014 - 01:01:50 EST


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.

This regression was introduced with commit 6b9fb7082409 "x86, ACPI,
irq: Consolidate algorithm of mapping (ioapic, pin) to IRQ number"

Reported-and-Tested-by: Thomas Richter <thor@xxxxxxxxxxxxxxxxx>
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Thomas Richter <thor@xxxxxxxxxxxxxxxxx>
Cc: rui.zhang@xxxxxxxxx
Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 3.17
Link: http://lkml.kernel.org/r/1413816327-12850-1-git-send-email-jiang.liu@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/