From patchwork Fri Apr 23 18:21:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lyude Paul X-Patchwork-Id: 12221267 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=-8.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 2AEE9C433ED for ; Fri, 23 Apr 2021 18:22:07 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CCDC2613C9 for ; Fri, 23 Apr 2021 18:22:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CCDC2613C9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2C9746E188; Fri, 23 Apr 2021 18:22:06 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 27B846E188 for ; Fri, 23 Apr 2021 18:22:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619202124; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=Cg55Iw1JXBxapqO9g4AqcatPlphFbJjxV2toSncpADY=; b=AuMGq4dMih1eg3ODpenH5GdR43/hnsUZCqM6wzl+EGiW/MaZJYJ9bXI6byDOSRD9B2bnob uL5hcD/aie6hjjUm9lRzismzSMQfZXXpblzhqqY0tVEgIl66ArRxoHuDiKhYS5bTjladXd k33V4NywtBvbGdI4JmEik3OH0K5kYUU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-416-l6AHCsVFP0q7LVIXbX1L9w-1; Fri, 23 Apr 2021 14:22:02 -0400 X-MC-Unique: l6AHCsVFP0q7LVIXbX1L9w-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5D51E343A3; Fri, 23 Apr 2021 18:22:01 +0000 (UTC) Received: from Ruby.lyude.net (ovpn-114-74.rdu2.redhat.com [10.10.114.74]) by smtp.corp.redhat.com (Postfix) with ESMTP id 117D7608BA; Fri, 23 Apr 2021 18:21:56 +0000 (UTC) From: Lyude Paul To: linux-tegra@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH 0/2] drm/tegra: Fix device/module refs for DP Date: Fri, 23 Apr 2021 14:21:44 -0400 Message-Id: <20210423182146.185633-1-lyude@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thierry Reding Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This patch series fixes a regression that was introduced by one of the changes I made to when Tegra registers its AUX adapters, along with fixing some reference leaks that I found along the way. !!!NOTE!!! There's one thing I'm not entirely sure about, which is the use of module references (e.g. try_module_get()) here. If I'm understanding how this code worked previously: since the get_device call in tegra_sor_probe() was previously the i2c adapter for the AUX channel - which itself is initialized in drm_dp_aux_register() - then I -think- that the module owner for the DDC adapter would likely have been drm_kms_helper. With these changes, if I'm understanding things correctly we're now just grabbing a module reference for ourselves - something which might not be the best idea? If anyone could confirm if I need to fix this or not that'd be appreciated, along with reviews of course :P Lyude Paul (2): drm/tegra: Get ref for DP AUX channel, not its ddc adapter drm/tegra: Fix DP AUX channel reference leaks drivers/gpu/drm/tegra/sor.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-)