drm: move protection stuff into separate function

Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/char/drm/drm_vm.c

@@ -41,6 +41,30 @@
 static void drm_vm_open(struct vm_area_struct *vma);
 static void drm_vm_close(struct vm_area_struct *vma);
 
+pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
+{
+	pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
+
+#if defined(__i386__) || defined(__x86_64__)
+	if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) {
+		pgprot_val(tmp) |= _PAGE_PCD;
+		pgprot_val(tmp) &= ~_PAGE_PWT;
+	}
+#elif defined(__powerpc__)
+	pgprot_val(tmp) |= _PAGE_NO_CACHE;
+	if (map_type == _DRM_REGISTERS)
+		pgprot_val(tmp) |= _PAGE_GUARDED;
+#endif
+#if defined(__ia64__)
+	if (efi_range_is_wc(vma->vm_start, vma->vm_end -
+				    vma->vm_start))
+		tmp = pgprot_writecombine(tmp);
+	else
+		tmp = pgprot_noncached(tmp);
+#endif
+	return tmp;
+}
+
 /**
  * \c nopage method for AGP virtual memory.
  *
@@ -600,25 +624,9 @@ int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 		/* fall through to _DRM_FRAME_BUFFER... */
 	case _DRM_FRAME_BUFFER:
 	case _DRM_REGISTERS:
-#if defined(__i386__) || defined(__x86_64__)
-		if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
-			pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
-			pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
-		}
-#elif defined(__powerpc__)
-		pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
-		if (map->type == _DRM_REGISTERS)
-			pgprot_val(vma->vm_page_prot) |= _PAGE_GUARDED;
-#endif
-		vma->vm_flags |= VM_IO;	/* not in core dump */
-#if defined(__ia64__)
-		if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
-			vma->vm_page_prot =
-			    pgprot_writecombine(vma->vm_page_prot);
-		else
-			vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-#endif
 		offset = dev->driver->get_reg_ofs(dev);
+		vma->vm_flags |= VM_IO;	/* not in core dump */
+		vma->vm_page_prot = drm_io_prot(map->type, vma);
 #ifdef __sparc__
 		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 		if (io_remap_pfn_range(vma, vma->vm_start,