[PATCH] IXP4xx: Ensure index is positive

[Roel Kluin]

The indexes are signed, make sure they are not negative
when we read the array elements.

Signed-off-by: Roel Kluin <roel.kluin at gmail.com>
---
 arch/arm/mach-ixp4xx/common.c     |    2 +-
 arch/arm/mach-ixp4xx/ixp4xx_npe.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index cfd52fb..2df77bc 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -119,7 +119,7 @@ EXPORT_SYMBOL(gpio_to_irq);
 
 int irq_to_gpio(int irq)
 {
-	int gpio = (irq < 32) ? irq2gpio[irq] : -EINVAL;
+	int gpio = (irq < 32 && irq >= 0) ? irq2gpio[irq] : -EINVAL;
 
 	if (gpio == -1)
 		return -EINVAL;
diff --git a/arch/arm/mach-ixp4xx/ixp4xx_npe.c b/arch/arm/mach-ixp4xx/ixp4xx_npe.c
index 47ac69c..30e1456 100644
--- a/arch/arm/mach-ixp4xx/ixp4xx_npe.c
+++ b/arch/arm/mach-ixp4xx/ixp4xx_npe.c
@@ -667,7 +667,7 @@ err:
 
 struct npe *npe_request(int id)
 {
-	if (id < NPE_COUNT)
+	if (id >= 0 && id < NPE_COUNT)
 		if (npe_tab[id].valid)
 			if (try_module_get(THIS_MODULE))
 				return &npe_tab[id];