[PATCH 7/9] tegra: make __arch_ioremap() with 0 size return NULL

[Jamie Iles]

Without __arch_ioremap(), __get_vm_area_node() with a zero size will
return a NULL pointer.  Make the arch specific ioremap() do the same
thing.

Cc: Colin Cross <ccross at android.com>
Cc: Erik Gilling <konkers at android.com>
Cc: Olof Johansson <olof at lixom.net>
Signed-off-by: Jamie Iles <jamie at jamieiles.com>
---
 arch/arm/mach-tegra/io.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-tegra/io.c b/arch/arm/mach-tegra/io.c
index ea50fe2..4f8d68c 100644
--- a/arch/arm/mach-tegra/io.c
+++ b/arch/arm/mach-tegra/io.c
@@ -67,6 +67,10 @@ void __init tegra_map_common_io(void)
 void __iomem *tegra_ioremap(unsigned long p, size_t size, unsigned int type)
 {
 	void __iomem *v = IO_ADDRESS(p);
+
+	if (!size)
+		return NULL;
+
 	if (v == NULL)
 		v = __arm_ioremap(p, size, type);
 	return v;
-- 
1.7.4.1