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pnpacpi: fix IRQ flag decoding

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When decoding IRQ trigger mode and polarity, it is not enough to mask by
IORESOURCE_BITS because there are now additional bits defined.  For
example, if IORESOURCE_IRQ_SHAREABLE was set, we failed to set *triggering
and *polarity at all.

I can't point to a failure that this patch fixes, but
bugs in this area have caused problems when resuming after
suspend, for example:

    http://bugzilla.kernel.org/show_bug.cgi?id=6316
    http://bugzilla.kernel.org/show_bug.cgi?id=9487
    https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/152187

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

[rene.herman@keyaccess.nl: fix comment]
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>
This commit is contained in:
Bjorn Helgaas
2008-06-09 16:52:04 -07:00
committed by Len Brown
parent 0638bc8dc0
commit e9fe9e1881
2 changed files with 15 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/pnp/pnpacpi/rsparser.c
View File

@@ -56,9 +56,11 @@ static int irq_flags(int triggering, int polarity, int shareable)
return flags;
}
static void decode_irq_flags(int flag, int *triggering, int *polarity)
static void decode_irq_flags(struct pnp_dev *dev, int flags, int *triggering,
int *polarity)
{
switch (flag) {
switch (flags & (IORESOURCE_IRQ_LOWLEVEL | IORESOURCE_IRQ_HIGHLEVEL |
IORESOURCE_IRQ_LOWEDGE | IORESOURCE_IRQ_HIGHEDGE)) {
case IORESOURCE_IRQ_LOWLEVEL:
*triggering = ACPI_LEVEL_SENSITIVE;
*polarity = ACPI_ACTIVE_LOW;
@@ -75,6 +77,12 @@ static void decode_irq_flags(int flag, int *triggering, int *polarity)
*triggering = ACPI_EDGE_SENSITIVE;
*polarity = ACPI_ACTIVE_HIGH;
break;
default:
dev_err(&dev->dev, "can't encode invalid IRQ mode %#x\n",
flags);
*triggering = ACPI_EDGE_SENSITIVE;
*polarity = ACPI_ACTIVE_HIGH;
break;
}
}
@@ -790,7 +798,7 @@ static void pnpacpi_encode_irq(struct pnp_dev *dev,
struct acpi_resource_irq *irq = &resource->data.irq;
int triggering, polarity;
decode_irq_flags(p->flags & IORESOURCE_BITS, &triggering, &polarity);
decode_irq_flags(dev, p->flags, &triggering, &polarity);
irq->triggering = triggering;
irq->polarity = polarity;
if (triggering == ACPI_EDGE_SENSITIVE)
@@ -813,7 +821,7 @@ static void pnpacpi_encode_ext_irq(struct pnp_dev *dev,
struct acpi_resource_extended_irq *extended_irq = &resource->data.extended_irq;
int triggering, polarity;
decode_irq_flags(p->flags & IORESOURCE_BITS, &triggering, &polarity);
decode_irq_flags(dev, p->flags, &triggering, &polarity);
extended_irq->producer_consumer = ACPI_CONSUMER;
extended_irq->triggering = triggering;
extended_irq->polarity = polarity;