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Commit e9fe9e18 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Len Brown
Browse files

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: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 0638bc8d

drivers/pnp/pnpacpi/rsparser.c

+12 −4
Original line number Diff line number Diff line
@@ -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;

include/linux/ioport.h

+3 −3
Original line number Diff line number Diff line
@@ -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 */