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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>
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1 changed files with 13 additions and 2 deletions
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@ -4145,6 +4145,16 @@ int drm_mode_getproperty_ioctl(struct drm_device *dev,
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return ret;
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}
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/**
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* drm_property_create_blob - Create new blob property
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*
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* Creates a new blob property for a specified DRM device, optionally
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* copying data.
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*
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* @dev: DRM device to create property for
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* @length: Length to allocate for blob data
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* @data: If specified, copies data into blob
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*/
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struct drm_property_blob *
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drm_property_create_blob(struct drm_device *dev, size_t length,
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const void *data)
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@ -4152,7 +4162,7 @@ drm_property_create_blob(struct drm_device *dev, size_t length,
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struct drm_property_blob *blob;
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int ret;
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if (!length || !data)
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if (!length)
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return NULL;
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blob = kzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL);
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@ -4162,6 +4172,7 @@ drm_property_create_blob(struct drm_device *dev, size_t length,
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blob->length = length;
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blob->dev = dev;
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if (data)
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memcpy(blob->data, data, length);
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mutex_lock(&dev->mode_config.blob_lock);
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