drm: fix DRM_CONSISTENT mapping

This patch got lost in the DRM git tree for ages, bring it back to life.

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

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/char/drm/drm_vm.c b/drivers/char/drm/drm_vm.c
index f7d4e29d5073..2d83b0b3a514 100644
--- a/drivers/char/drm/drm_vm.c
+++ b/drivers/char/drm/drm_vm.c
@@ -175,8 +175,7 @@ static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
 
         offset = address - vma->vm_start;
         i = (unsigned long)map->handle + offset;
-        page = (map->type == _DRM_CONSISTENT) ?
-                virt_to_page((void *)i) : vmalloc_to_page((void *)i);
+        page = vmalloc_to_page((void *)i);
         if (!page)
                 return NOPAGE_SIGBUS;
         get_page(page);
@@ -651,10 +650,15 @@ static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
                           vma->vm_start, vma->vm_end, map->offset + offset);
                 vma->vm_ops = &drm_vm_ops;
                 break;
-        case _DRM_SHM:
         case _DRM_CONSISTENT:
-                /* Consistent memory is really like shared memory. It's only
-                 * allocate in a different way */
+                /* Consistent memory is really like shared memory. But
+                 * it's allocated in a different way, so avoid nopage */
+                if (remap_pfn_range(vma, vma->vm_start,
+                    page_to_pfn(virt_to_page(map->handle)),
+                    vma->vm_end - vma->vm_start, vma->vm_page_prot))
+                        return -EAGAIN;
+        /* fall through to _DRM_SHM */
+        case _DRM_SHM:
                 vma->vm_ops = &drm_vm_shm_ops;
                 vma->vm_private_data = (void *)map;
                 /* Don't let this area swap.  Change when