[PATCH] PNPACPI: support shareable interrupts

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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 9 insertions, 3 deletions

diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c
index 3a4a644c2686..212268881857 100644
--- a/drivers/pnp/pnpacpi/rsparser.c
+++ b/drivers/pnp/pnpacpi/rsparser.c
@@ -74,7 +74,7 @@ static void decode_irq_flags(int flag, int *triggering, int *polarity)
 
 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(struct pnp_resource_table *res, u32 gsi,
                 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_resource(struct acpi_resource *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_resource(struct acpi_resource *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 --git a/include/linux/ioport.h b/include/linux/ioport.h
index 87a9fc039b47..5612dfeeae50 100644
--- a/include/linux/ioport.h
+++ b/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)