pnpacpi: fix shareable IRQ encode/decode

When we encode IRQ resources, we should use the "shareable" flag we got
from _PRS rather than guessing based on the IRQ trigger mode.

This is based on a patch by Tom Jaeger:
    http://bugzilla.kernel.org/show_bug.cgi?id=9487#c32

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c
index ab09fe6..8681ff6 100644 (file)
--- a/drivers/pnp/pnpacpi/rsparser.c
+++ b/drivers/pnp/pnpacpi/rsparser.c
@@ -50,14 +50,14 @@ static int irq_flags(int triggering, int polarity, int shareable)
                        flags = IORESOURCE_IRQ_HIGHEDGE;
        }
 
-       if (shareable)
+       if (shareable == ACPI_SHARED)
                flags |= IORESOURCE_IRQ_SHAREABLE;
 
        return flags;
 }
 
 static void decode_irq_flags(struct pnp_dev *dev, int flags, int *triggering,
-                            int *polarity)
+                            int *polarity, int *shareable)
 {
        switch (flags & (IORESOURCE_IRQ_LOWLEVEL | IORESOURCE_IRQ_HIGHLEVEL |
                         IORESOURCE_IRQ_LOWEDGE  | IORESOURCE_IRQ_HIGHEDGE)) {
@@ -84,6 +84,11 @@ static void decode_irq_flags(struct pnp_dev *dev, int flags, int *triggering,
                *polarity = ACPI_ACTIVE_HIGH;
                break;
        }
+
+       if (flags & IORESOURCE_IRQ_SHAREABLE)
+               *shareable = ACPI_SHARED;
+       else
+               *shareable = ACPI_EXCLUSIVE;
 }
 
 static void pnpacpi_parse_allocated_irqresource(struct pnp_dev *dev,
@@ -796,15 +801,12 @@ static void pnpacpi_encode_irq(struct pnp_dev *dev,
                               struct resource *p)
 {
        struct acpi_resource_irq *irq = &resource->data.irq;
-       int triggering, polarity;
+       int triggering, polarity, shareable;
 
-       decode_irq_flags(dev, p->flags, &triggering, &polarity);
+       decode_irq_flags(dev, p->flags, &triggering, &polarity, &shareable);
        irq->triggering = triggering;
        irq->polarity = polarity;
-       if (triggering == ACPI_EDGE_SENSITIVE)
-               irq->sharable = ACPI_EXCLUSIVE;
-       else
-               irq->sharable = ACPI_SHARED;
+       irq->sharable = shareable;
        irq->interrupt_count = 1;
        irq->interrupts[0] = p->start;
 
@@ -819,16 +821,13 @@ static void pnpacpi_encode_ext_irq(struct pnp_dev *dev,
                                   struct resource *p)
 {
        struct acpi_resource_extended_irq *extended_irq = &resource->data.extended_irq;
-       int triggering, polarity;
+       int triggering, polarity, shareable;
 
-       decode_irq_flags(dev, p->flags, &triggering, &polarity);
+       decode_irq_flags(dev, p->flags, &triggering, &polarity, &shareable);
        extended_irq->producer_consumer = ACPI_CONSUMER;
        extended_irq->triggering = triggering;
        extended_irq->polarity = polarity;
-       if (triggering == ACPI_EDGE_SENSITIVE)
-               extended_irq->sharable = ACPI_EXCLUSIVE;
-       else
-               extended_irq->sharable = ACPI_SHARED;
+       extended_irq->sharable = shareable;
        extended_irq->interrupt_count = 1;
        extended_irq->interrupts[0] = p->start;