ioremap_page_range() cannot provide us memory with the the non-secure section flag set unfortunately at present ioremap+MT_DEVICE_NS will fallback to this function and spuriously return a virtual pointer to what is effectively MT_DEVICE memory.
This patch makes the fallback to ioremap_page_range() ineffective; to allocate MT_DEVICE_NS memory we must rely instead on the platform startup code providing a suitable static mapping.
Signed-off-by: Daniel Thompson daniel.thompson@linaro.org --- arch/arm/mm/ioremap.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c index d1e5ad7..1cb12f8 100644 --- a/arch/arm/mm/ioremap.c +++ b/arch/arm/mm/ioremap.c @@ -319,6 +319,10 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn, err = remap_area_sections(addr, pfn, size, type); } else #endif + if (type->prot_sect & PMD_SECT_NS) + /* required section flag is not achievable; give up */ + return NULL; + else err = ioremap_page_range(addr, addr + size, paddr, __pgprot(type->prot_pte));