ARM: dma-mapping: don't allow DMA mappings to be marked executable

DMA mapping permissions were being derived from pgprot_kernel directly
without using PAGE_KERNEL.  This causes them to be marked with executable
permission, which is not what we want.  Fix this.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
		    void *cpu_addr, dma_addr_t dma_addr, size_t size,
		    struct dma_attrs *attrs)
{
	unsigned long uaddr = vma->vm_start;
	unsigned long usize = vma->vm_end - vma->vm_start;
	struct page **pages = __iommu_get_pages(cpu_addr, attrs);

	vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);

	if (!pages)
		return -ENXIO;

	do {
		int ret = vm_insert_page(vma, uaddr, *pages++);
		if (ret) {
			pr_err("Remapping memory failed: %d\n", ret);
			return ret;
		}
		uaddr += PAGE_SIZE;
		usize -= PAGE_SIZE;
	} while (usize > 0);

	return 0;
}

static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
		    void *cpu_addr, dma_addr_t dma_addr, size_t size,
		    struct dma_attrs *attrs)
{
	unsigned long uaddr = vma->vm_start;
	unsigned long usize = vma->vm_end - vma->vm_start;
	struct page **pages = __iommu_get_pages(cpu_addr, attrs);

	vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);

	if (!pages)
		return -ENXIO;

	do {
		int ret = vm_insert_page(vma, uaddr, *pages++);
		if (ret) {
			pr_err("Remapping memory failed: %d\n", ret);
			return ret;
		}
		uaddr += PAGE_SIZE;
		usize -= PAGE_SIZE;
	} while (usize > 0);

	return 0;
}
