From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
While we want to potentially support multiple different gamma/degamma
LUT sizes we can (and should) at least check that the blob length
is a multiple of the LUT entry size.
v2: s/expected_size_mod/expected_elem_size/ (Daniel)
Add kernel doc (Daniel)
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
Documentation/gpu/drm-kms.rst | 3 +++
drivers/gpu/drm/drm_atomic.c | 39 +++++++++++++++++++++++++++++++++++----
2 files changed, 38 insertions(+), 4 deletions(-)
diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-kms.rst
index 56a3780e39b8..1dffd1ac4cd4 100644
--- a/Documentation/gpu/drm-kms.rst
+++ b/Documentation/gpu/drm-kms.rst
@@ -286,6 +286,9 @@ Atomic Mode Setting Function Reference
.. kernel-doc:: drivers/gpu/drm/drm_atomic.c
:export:
+.. kernel-doc:: drivers/gpu/drm/drm_atomic.c
+ :internal:
+
CRTC Abstraction
================
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 01060669dd49..a55f611d2a6f 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -408,11 +408,36 @@ int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
}
EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
+/**
+ * drm_atomic_replace_property_blob_from_id - lookup the new blob and replace the old one with it
+ * @dev: DRM device
+ * @blob: a pointer to the member blob to be replaced
+ * @blob_id: ID of the new blob
+ * @expected_size: total expected size of the blob data (in bytes)
+ * @expected_elem_size: expected element size of the blob data (in bytes)
+ * @replaced: did the blob get replaced?
+ *
+ * Replace @blob with another blob with the ID @blob_id. If @blob_id is zero
+ * @blob becomes NULL.
+ *
+ * If @expected_size is positive the new blob length is expected to be equal
+ * to @expected_size bytes. If @expected_elem_size is positive the new blob
+ * length is expected to be a multiple of @expected_elem_size bytes. Otherwise
+ * an error is returned.
+ *
+ * @replaced will indicate to the caller whether the blob was replaced or not.
+ * If the old and new blobs we in fact the same blob @replaced will be false
+ * otherwise it will be true.
+ *
+ * RETURNS:
+ * Zero on success, error code on failure.
+ */
static int
drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
struct drm_property_blob **blob,
uint64_t blob_id,
ssize_t expected_size,
+ ssize_t expected_elem_size,
bool *replaced)
{
struct drm_property_blob *new_blob = NULL;
@@ -422,7 +447,13 @@ drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
if (new_blob == NULL)
return -EINVAL;
- if (expected_size > 0 && expected_size != new_blob->length) {
+ if (expected_size > 0 &&
+ new_blob->length != expected_size) {
+ drm_property_blob_put(new_blob);
+ return -EINVAL;
+ }
+ if (expected_elem_size > 0 &&
+ new_blob->length % expected_elem_size != 0) {
drm_property_blob_put(new_blob);
return -EINVAL;
}
@@ -470,7 +501,7 @@ int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
ret = drm_atomic_replace_property_blob_from_id(dev,
&state->degamma_lut,
val,
- -1,
+ -1, sizeof(struct drm_color_lut),
&replaced);
state->color_mgmt_changed |= replaced;
return ret;
@@ -478,7 +509,7 @@ int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
ret = drm_atomic_replace_property_blob_from_id(dev,
&state->ctm,
val,
- sizeof(struct drm_color_ctm),
+ sizeof(struct drm_color_ctm), -1,
&replaced);
state->color_mgmt_changed |= replaced;
return ret;
@@ -486,7 +517,7 @@ int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
ret = drm_atomic_replace_property_blob_from_id(dev,
&state->gamma_lut,
val,
- -1,
+ -1, sizeof(struct drm_color_lut),
&replaced);
state->color_mgmt_changed |= replaced;
return ret;
--
2.16.1
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
