[patch 1/2] resources: clean up pnp_irq() error return

[Dan Carpenter <dan.carpenter@oracle.com>]

pnp_irq() returns -1 on error but cast to an unsigned.  It is confusing
for callers who assume that it returns a negative value.  I have
introduced a new define IORESOURCE_INVALID which is the same value but
hopefully it looks less like a negative value.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 89b7c24..fdccfa5 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -55,6 +55,8 @@ struct resource {
 #define IORESOURCE_AUTO		0x40000000
 #define IORESOURCE_BUSY		0x80000000	/* Driver has marked this resource busy */
 
+#define IORESOURCE_INVALID	((resource_size_t)-1)
+
 /* PnP IRQ specific bits (IORESOURCE_BITS) */
 #define IORESOURCE_IRQ_HIGHEDGE		(1<<0)
 #define IORESOURCE_IRQ_LOWEDGE		(1<<1)
diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index 195aafc..818669c 100644
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -151,7 +151,7 @@ static inline resource_size_t pnp_irq(struct pnp_dev *dev, unsigned int bar)
 
 	if (pnp_resource_valid(res))
 		return res->start;
-	return -1;
+	return IORESOURCE_INVALID;
 }
 
 static inline unsigned long pnp_irq_flags(struct pnp_dev *dev, unsigned int bar)