diff options
Diffstat (limited to 'linux-core/drm_crtc_helper.c')
| -rw-r--r-- | linux-core/drm_crtc_helper.c | 49 |
1 files changed, 46 insertions, 3 deletions
diff --git a/linux-core/drm_crtc_helper.c b/linux-core/drm_crtc_helper.c index f35c0a49..58d21b99 100644 --- a/linux-core/drm_crtc_helper.c +++ b/linux-core/drm_crtc_helper.c @@ -1,6 +1,4 @@ - -/* - * Copyright (c) 2006-2007 Intel Corporation +/* (c) 2006-2007 Intel Corporation * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> * * DRM core CRTC related functions @@ -763,3 +761,48 @@ int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, return 0; } EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); + +/** + * drm_get_buffer_object - find the buffer object for a given handle + * @dev: DRM device + * @bo: pointer to caller's buffer_object pointer + * @handle: handle to lookup + * + * LOCKING: + * Must take @dev's struct_mutex to protect buffer object lookup. + * + * Given @handle, lookup the buffer object in @dev and put it in the caller's + * @bo pointer. + * + * RETURNS: + * Zero on success, -EINVAL if the handle couldn't be found. + */ +int drm_get_buffer_object(struct drm_device *dev, struct drm_buffer_object **bo, unsigned long handle) +{ + struct drm_user_object *uo; + struct drm_hash_item *hash; + int ret; + + *bo = NULL; + + mutex_lock(&dev->struct_mutex); + ret = drm_ht_find_item(&dev->object_hash, handle, &hash); + if (ret) { + DRM_ERROR("Couldn't find handle.\n"); + ret = -EINVAL; + goto out_err; + } + + uo = drm_hash_entry(hash, struct drm_user_object, hash); + if (uo->type != drm_buffer_type) { + ret = -EINVAL; + goto out_err; + } + + *bo = drm_user_object_entry(uo, struct drm_buffer_object, base); + ret = 0; +out_err: + mutex_unlock(&dev->struct_mutex); + return ret; +} +EXPORT_SYMBOL(drm_get_buffer_object); |