From: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Add a helper function omap_gem_validate_flags() which validates the
omap_bo flags passed from the userspace.
Also drop the dev_err() message, as the userspace can cause that at
will.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
---
drivers/gpu/drm/omapdrm/omap_gem.c | 40 ++++++++++++++++++++++++++----
1 file changed, 35 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c
index 539eec05b1c2..705403825e9d 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem.c
@@ -1130,6 +1130,38 @@ void omap_gem_free_object(struct drm_gem_object *obj)
kfree(omap_obj);
}
+static bool omap_gem_validate_flags(struct drm_device *dev, u32 flags)
+{
+ struct omap_drm_private *priv = dev->dev_private;
+
+ switch (flags & OMAP_BO_CACHE_MASK) {
+ case OMAP_BO_CACHED:
+ case OMAP_BO_WC:
+ case OMAP_BO_CACHE_MASK:
+ break;
+
+ default:
+ return false;
+ }
+
+ if (flags & OMAP_BO_TILED_MASK) {
+ if (!priv->usergart)
+ return false;
+
+ switch (flags & OMAP_BO_TILED_MASK) {
+ case OMAP_BO_TILED_8:
+ case OMAP_BO_TILED_16:
+ case OMAP_BO_TILED_32:
+ break;
+
+ default:
+ return false;
+ }
+ }
+
+ return true;
+}
+
/* GEM buffer object constructor */
struct drm_gem_object *omap_gem_new(struct drm_device *dev,
union omap_gem_size gsize, u32 flags)
@@ -1141,13 +1173,11 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
size_t size;
int ret;
+ if (!omap_gem_validate_flags(dev, flags))
+ return NULL;
+
/* Validate the flags and compute the memory and cache flags. */
if (flags & OMAP_BO_TILED_MASK) {
- if (!priv->usergart) {
- dev_err(dev->dev, "Tiled buffers require DMM\n");
- return NULL;
- }
-
/*
* Tiled buffers are always shmem paged backed. When they are
* scanned out, they are remapped into DMM/TILER.
--
2.17.1
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