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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D86DC433EF for ; Mon, 15 Nov 2021 22:51:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC2A963217 for ; Mon, 15 Nov 2021 22:51:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237379AbhKOWyh (ORCPT ); Mon, 15 Nov 2021 17:54:37 -0500 Received: from mail.kernel.org ([198.145.29.99]:50328 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239369AbhKOSoe (ORCPT ); Mon, 15 Nov 2021 13:44:34 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 61EB163364; Mon, 15 Nov 2021 18:05:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1636999555; bh=RT4c1amvKbIveG1AjmPg6G5GHIIEYCHdQS57BgVmXgg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e4d+/RN4YFW5CFbbNU7KcJ04gaqkABlLeKTS9nH94zRX42G34uuQVADv/iK7NxN8n gUOsfnwZRME1Ai+SyYKhzi1bAoZ9hejrDv2Vdy7H/kfFusih210ghAk6EIxXQ4tMJ3 1YfPEfZJbay67LIFTwV/0O0M2TcNNvQKvlXiw0Lk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paul Cercueil , Neil Armstrong , Robert Foss , Sasha Levin Subject: [PATCH 5.14 340/849] drm/bridge: it66121: Wait for next bridge to be probed Date: Mon, 15 Nov 2021 17:57:03 +0100 Message-Id: <20211115165431.736940201@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165419.961798833@linuxfoundation.org> References: <20211115165419.961798833@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Paul Cercueil [ Upstream commit 8b03e3fc79189b17d31a82f5e175698802a11e87 ] 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 Fixes: 988156dc2fc9 ("drm: bridge: add it66121 driver") Reviewed-by: Neil Armstrong Signed-off-by: Robert Foss Link: https://patchwork.freedesktop.org/patch/msgid/20210827163956.27517-2-paul@crapouillou.net Signed-off-by: Sasha Levin --- 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 b130d01147c6c..9dc41a7b91362 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