From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76182C432BE for ; Fri, 27 Aug 2021 16:40:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5B04460F14 for ; Fri, 27 Aug 2021 16:40:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233404AbhH0QlE (ORCPT ); Fri, 27 Aug 2021 12:41:04 -0400 Received: from aposti.net ([89.234.176.197]:60106 "EHLO aposti.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230421AbhH0QlC (ORCPT ); Fri, 27 Aug 2021 12:41:02 -0400 From: Paul Cercueil To: Phong LE , Neil Armstrong Cc: Andrzej Hajda , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , list@opendingux.net, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Paul Cercueil Subject: [PATCH 2/2] drm/bridge: it66121: Wait for next bridge to be probed Date: Fri, 27 Aug 2021 17:39:56 +0100 Message-Id: <20210827163956.27517-2-paul@crapouillou.net> In-Reply-To: <20210827163956.27517-1-paul@crapouillou.net> References: <20210827163956.27517-1-paul@crapouillou.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If run before the next bridge is initialized, of_drm_find_bridge() will give us a NULL pointer. If that's the case, return -EPROBE_DEFER; we may have more luck next time. Signed-off-by: Paul Cercueil --- drivers/gpu/drm/bridge/ite-it66121.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c index b130d01147c6..9dc41a7b9136 100644 --- a/drivers/gpu/drm/bridge/ite-it66121.c +++ b/drivers/gpu/drm/bridge/ite-it66121.c @@ -924,6 +924,9 @@ static int it66121_probe(struct i2c_client *client, ctx->next_bridge = of_drm_find_bridge(ep); of_node_put(ep); + if (!ctx->next_bridge) + return -EPROBE_DEFER; + i2c_set_clientdata(client, ctx); mutex_init(&ctx->lock); -- 2.33.0