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drm: Allow creating blob properties without copy 

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>
Tested-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Stone 2015-05-22 13:34:49 +01:00 committed by Daniel Vetter
parent 934a8a899a
commit 99531d9bb7
1 changed files with 13 additions and 2 deletions
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15
drivers/gpu/drm/drm_crtc.c
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@ -4145,6 +4145,16 @@ done:
return ret;
}
/**
* drm_property_create_blob - Create new blob property
*
* Creates a new blob property for a specified DRM device, optionally
* copying data.
*
* @dev: DRM device to create property for
* @length: Length to allocate for blob data
* @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)
@ -4152,7 +4162,7 @@ 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);
@ -4162,7 +4172,8 @@ 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);