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authorHugh Dickins <hugh@veritas.com>2007-03-24 17:55:16 +1100
committerDave Airlie <airlied@linux.ie>2007-03-24 18:00:28 +1100
commit38315878a560eede1a2db52e511ad3a2cfbb4206 (patch)
treed28def51879e35b1b6faddfc457bd37d9a1f2700 /drivers/char/drm/drm_vm.c
parentd7d8aac79dc38cbdef83b774e49bafdae9918137 (diff)
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>
Diffstat (limited to 'drivers/char/drm/drm_vm.c')
-rw-r--r--drivers/char/drm/drm_vm.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/char/drm/drm_vm.c b/drivers/char/drm/drm_vm.c
index f7d4e29d507..2d83b0b3a51 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