ARM: Prohibit ioremap() on kernel managed RAM

[pandora-kernel.git] / arch / arm / mm / ioremap.c

diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index 28c8b95..03f1193 100644 (file)
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -268,6 +268,12 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
        if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
                return NULL;
 
+       /*
+        * Don't allow RAM to be mapped - this causes problems with ARMv6+
+        */
+       if (WARN_ON(pfn_valid(pfn)))
+               return NULL;
+
        type = get_mem_type(mtype);
        if (!type)
                return NULL;