From: Bjorn Helgaas <bjorn.helgaas@hp.com>

ACPI supplies a "shareable" indication, but PNPACPI ignores it.  If a PNP
device uses a shared interrupt, request_irq() fails because the PNP driver
can't tell whether to supply SA_SHIRQ.

This patch allows PNP drivers to test
    (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Adam Belay <ambx1@neo.rr.com>
Cc: Matthieu Castet <castet.matthieu@free.fr>
Cc: Li Shaohua <shaohua.li@intel.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/pnp/pnpacpi/rsparser.c |   11 ++++++++---
 include/linux/ioport.h         |    1 +
 2 files changed, 9 insertions(+), 3 deletions(-)

diff -puN drivers/pnp/pnpacpi/rsparser.c~pnpacpi-support-shareable-interrupts drivers/pnp/pnpacpi/rsparser.c
--- a/drivers/pnp/pnpacpi/rsparser.c~pnpacpi-support-shareable-interrupts
+++ a/drivers/pnp/pnpacpi/rsparser.c
@@ -74,7 +74,7 @@ static void decode_irq_flags(int flag, i
 
 static void
 pnpacpi_parse_allocated_irqresource(struct pnp_resource_table *res, u32 gsi,
-	int triggering, int polarity)
+	int triggering, int polarity, int shareable)
 {
 	int i = 0;
 	int irq;
@@ -95,6 +95,9 @@ pnpacpi_parse_allocated_irqresource(stru
 		return;
 	}
 
+	if (shareable)
+		res->irq_resource[i].flags |= IORESOURCE_IRQ_SHAREABLE;
+
 	res->irq_resource[i].start = irq;
 	res->irq_resource[i].end = irq;
 	pcibios_penalize_isa_irq(irq, 1);
@@ -194,7 +197,8 @@ static acpi_status pnpacpi_allocated_res
 			pnpacpi_parse_allocated_irqresource(res_table,
 				res->data.irq.interrupts[i],
 				res->data.irq.triggering,
-				res->data.irq.polarity);
+				res->data.irq.polarity,
+				res->data.irq.sharable);
 		}
 		break;
 
@@ -255,7 +259,8 @@ static acpi_status pnpacpi_allocated_res
 			pnpacpi_parse_allocated_irqresource(res_table,
 				res->data.extended_irq.interrupts[i],
 				res->data.extended_irq.triggering,
-				res->data.extended_irq.polarity);
+				res->data.extended_irq.polarity,
+				res->data.extended_irq.sharable);
 		}
 		break;
 
diff -puN include/linux/ioport.h~pnpacpi-support-shareable-interrupts include/linux/ioport.h
--- a/include/linux/ioport.h~pnpacpi-support-shareable-interrupts
+++ a/include/linux/ioport.h
@@ -55,6 +55,7 @@ struct resource_list {
 #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) */
 #define IORESOURCE_DMA_TYPE_MASK	(3<<0)
_