diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-03 21:26:28 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-08-08 11:05:21 +0300 |
| commit | aafdcfd3f9aa3c9f77ae4e9385f21bf9ae120d3e (patch) | |
| tree | 9014ad1eabd35eb5f85730e321c41b0c7cb1881e /drivers/gpu/drm/drm_mm.c | |
| parent | a3ccc461668951c14b7c656233b993f0dea326ce (diff) | |
| download | linux-aafdcfd3f9aa3c9f77ae4e9385f21bf9ae120d3e.tar.xz | |
drm: Declare that create drm_mm nodes with size 0 is illegal
At a higher level, all objects are created with definite size i.e. 0 is
illegal. In forthcoming patches, this assumption is dependent upon in
the drm_mm range manager, i.e. trying to create a drm_mm node with size
0 will have undefined behaviour. Add a couple of WARNs upon creating the
drm_mm node to prevent later bugs.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1470248788-30873-1-git-send-email-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/drm_mm.c')
| -rw-r--r-- | drivers/gpu/drm/drm_mm.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c index 3f56d4b0cdae..11d44a1e0ab3 100644 --- a/drivers/gpu/drm/drm_mm.c +++ b/drivers/gpu/drm/drm_mm.c @@ -250,6 +250,9 @@ int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node) struct drm_mm_node *hole; u64 hole_start, hole_end; + if (WARN_ON(node->size == 0)) + return -EINVAL; + end = node->start + node->size; /* Find the relevant hole to add our node to */ @@ -317,6 +320,9 @@ int drm_mm_insert_node_generic(struct drm_mm *mm, struct drm_mm_node *node, { struct drm_mm_node *hole_node; + if (WARN_ON(size == 0)) + return -EINVAL; + hole_node = drm_mm_search_free_generic(mm, size, alignment, color, sflags); if (!hole_node) @@ -419,6 +425,9 @@ int drm_mm_insert_node_in_range_generic(struct drm_mm *mm, struct drm_mm_node *n { struct drm_mm_node *hole_node; + if (WARN_ON(size == 0)) + return -EINVAL; + hole_node = drm_mm_search_free_in_range_generic(mm, size, alignment, color, start, end, sflags); |