Make the data parameter to drm_property_create_blob optional; if omitted, the copy will be skipped and the data will be empty.
Signed-off-by: Daniel Stone daniels@collabora.com Reviewed-by: Maarten Lankhorst maarten.lankhorst@intel.com --- drivers/gpu/drm/drm_crtc.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 6f3cafb..f7b075b 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -4204,6 +4204,16 @@ done: return ret; }
+/** + * drm_property_create_blob - Create new blob property + * + * Creates a new blob property for a specified DRM device, optionally + * copying data. + * + * @param dev DRM device to create property for + * @param length Length to allocate for blob data + * @param data If specified, copies data into blob + */ struct drm_property_blob * drm_property_create_blob(struct drm_device *dev, size_t length, const void *data) @@ -4211,7 +4221,7 @@ drm_property_create_blob(struct drm_device *dev, size_t length, struct drm_property_blob *blob; int ret;
- if (!length || !data) + if (!length) return NULL;
blob = kzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL); @@ -4221,7 +4231,8 @@ drm_property_create_blob(struct drm_device *dev, size_t length, blob->length = length; blob->dev = dev;
- memcpy(blob->data, data, length); + if (data) + memcpy(blob->data, data, length);
mutex_lock(&dev->mode_config.blob_lock);