From: Boris Brezillon Date: Tue, 7 Jan 2020 18:58:03 +0000 (+0100) Subject: Revert "drm/bridge: Fix a NULL pointer dereference in drm_atomic_bridge_chain_check()" X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=6ae1a4bbe1138e883c34ea78ef29986d9f420bd7;p=uclinux-h8%2Flinux.git Revert "drm/bridge: Fix a NULL pointer dereference in drm_atomic_bridge_chain_check()" This reverts commit b18398c16e17 ("drm/bridge: Fix a NULL pointer dereference in drm_atomic_bridge_chain_check()"). Commit 6ed7e9625fa6 ("drm/bridge: Add a drm_bridge_state object") introduced a circular dependency between drm.ko and drm_kms_helper.ko which uncovered a misdesign in how the whole thing was implemented. Let's revert all patches depending on the bridge_state infrastructure for now. Signed-off-by: Boris Brezillon Acked-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/20200107185807.606999-2-boris.brezillon@collabora.com --- diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index 32d43bfeeca1..37400607e9b7 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -938,19 +938,15 @@ int drm_atomic_bridge_chain_check(struct drm_bridge *bridge, struct drm_connector_state *conn_state) { struct drm_connector *conn = conn_state->connector; - struct drm_encoder *encoder; + struct drm_encoder *encoder = bridge->encoder; struct drm_bridge *iter; int ret; - if (!bridge) - return 0; - ret = drm_atomic_bridge_chain_select_bus_fmts(bridge, crtc_state, conn_state); if (ret) return ret; - encoder = bridge->encoder; list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) { int ret;