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drm: fix DRM_CONSISTENT mapping

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

Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
Hugh Dickins 2007-03-24 17:55:16 +11:00 committed by Dave Airlie
parent d7d8aac79d
commit 38315878a5
1 changed files with 9 additions and 5 deletions
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14
drivers/char/drm/drm_vm.c
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@ -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