pnpacpi: fix IRQ flag decoding

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>

diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c
index 0201c8a..ab09fe6 100644 (file)
--- a/drivers/pnp/pnpacpi/rsparser.c
+++ b/drivers/pnp/pnpacpi/rsparser.c
@@ -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;

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index d5d40a9..c6801bf 100644 (file)
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -53,14 +53,14 @@ struct resource_list {
 #define IORESOURCE_AUTO                0x40000000
 #define IORESOURCE_BUSY                0x80000000      /* Driver has marked this resource busy */
 
-/* ISA PnP IRQ specific bits (IORESOURCE_BITS) */
+/* PnP IRQ specific bits (IORESOURCE_BITS) */
 #define IORESOURCE_IRQ_HIGHEDGE                (1<<0)
 #define IORESOURCE_IRQ_LOWEDGE         (1<<1)
 #define IORESOURCE_IRQ_HIGHLEVEL       (1<<2)
 #define IORESOURCE_IRQ_LOWLEVEL                (1<<3)
 #define IORESOURCE_IRQ_SHAREABLE       (1<<4)
 
-/* ISA PnP DMA specific bits (IORESOURCE_BITS) */
+/* PnP DMA specific bits (IORESOURCE_BITS) */
 #define IORESOURCE_DMA_TYPE_MASK       (3<<0)
 #define IORESOURCE_DMA_8BIT            (0<<0)
 #define IORESOURCE_DMA_8AND16BIT       (1<<0)
@@ -76,7 +76,7 @@ struct resource_list {
 #define IORESOURCE_DMA_TYPEB           (2<<6)
 #define IORESOURCE_DMA_TYPEF           (3<<6)
 
-/* ISA PnP memory I/O specific bits (IORESOURCE_BITS) */
+/* PnP memory I/O specific bits (IORESOURCE_BITS) */
 #define IORESOURCE_MEM_WRITEABLE       (1<<0)  /* dup: IORESOURCE_READONLY */
 #define IORESOURCE_MEM_CACHEABLE       (1<<1)  /* dup: IORESOURCE_CACHEABLE */
 #define IORESOURCE_MEM_RANGELENGTH     (1<<2)  /* dup: IORESOURCE_RANGELENGTH */