From 0a0e79a2d9ed846fc3c3f5ef92b691e81bc9721a Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 17 Oct 2025 19:33:27 +0300 Subject: [PATCH] drm/atomic: WARN about invalid drm_foo_get_state() usage MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit drm_{crtc,plane,connector,private_obj}_get_state() must not be called after the atomic check phase. At that point the commit has been carved in stone and no new objects must be introduced into it. WARN if anyone attempts to violate this rule. Cc: Maxime Ripard Cc: Dan Carpenter Signed-off-by: Ville Syrjälä Link: https://patch.msgid.link/20251017163327.9074-2-ville.syrjala@linux.intel.com Reviewed-by: Maxime Ripard --- drivers/gpu/drm/drm_atomic.c | 8 ++++++++ include/drm/drm_atomic.h | 8 ++++++++ 2 files changed, 16 insertions(+) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index 5d31b20e67ab9..e05820b188327 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -200,6 +200,8 @@ void drm_atomic_state_default_clear(struct drm_atomic_state *state) drm_dbg_atomic(dev, "Clearing atomic state %p\n", state); + state->checked = false; + for (i = 0; i < state->num_connector; i++) { struct drm_connector *connector = state->connectors[i].ptr; @@ -348,6 +350,7 @@ drm_atomic_get_crtc_state(struct drm_atomic_state *state, struct drm_crtc_state *crtc_state; WARN_ON(!state->acquire_ctx); + drm_WARN_ON(state->dev, state->checked); crtc_state = drm_atomic_get_new_crtc_state(state, crtc); if (crtc_state) @@ -528,6 +531,7 @@ drm_atomic_get_plane_state(struct drm_atomic_state *state, struct drm_plane_state *plane_state; WARN_ON(!state->acquire_ctx); + drm_WARN_ON(state->dev, state->checked); /* the legacy pointers should never be set */ WARN_ON(plane->fb); @@ -837,6 +841,7 @@ drm_atomic_get_private_obj_state(struct drm_atomic_state *state, struct drm_private_state *obj_state; WARN_ON(!state->acquire_ctx); + drm_WARN_ON(state->dev, state->checked); obj_state = drm_atomic_get_new_private_obj_state(state, obj); if (obj_state) @@ -1131,6 +1136,7 @@ drm_atomic_get_connector_state(struct drm_atomic_state *state, struct drm_connector_state *connector_state; WARN_ON(!state->acquire_ctx); + drm_WARN_ON(state->dev, state->checked); ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx); if (ret) @@ -1543,6 +1549,8 @@ int drm_atomic_check_only(struct drm_atomic_state *state) requested_crtc, affected_crtc); } + state->checked = true; + return 0; } EXPORT_SYMBOL(drm_atomic_check_only); diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h index 155e82f87e4d4..2e433d44658d6 100644 --- a/include/drm/drm_atomic.h +++ b/include/drm/drm_atomic.h @@ -523,6 +523,14 @@ struct drm_atomic_state { */ bool duplicated : 1; + /** + * @checked: + * + * Indicates the state has been checked and thus must no longer + * be mutated. For internal use only, do not consult from drivers. + */ + bool checked : 1; + /** * @planes: * -- 2.47.3