drm: bridge: document bridge attach/detach imbalance

peda-r · Andrzej Hajda · commit 169cc4c7a14e · 2018-09-13T11:28:12.000+02:00
Since commit 4a878c0 ("drm: bridge: Detach bridge from encoder at encoder cleanup time"), it is generally no longer correct to detach bridges from encoders manually. Document that. Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180806061910.29914-3-peda@axentia.se
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
@@ -104,6 +104,10 @@ EXPORT_SYMBOL(drm_bridge_remove);
  * If non-NULL the previous bridge must be already attached by a call to this
  * function.
  *
+ * Note that bridges attached to encoders are auto-detached during encoder
+ * cleanup in drm_encoder_cleanup(), so drm_bridge_attach() should generally
+ * *not* be balanced with a drm_bridge_detach() in driver code.
+ *
  * RETURNS:
  * Zero on success, error code on failure
  */
