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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 019EDECDFB1 for ; Tue, 17 Jul 2018 07:33:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A4ED420858 for ; Tue, 17 Jul 2018 07:33:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A4ED420858 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=wunner.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729713AbeGQIFI (ORCPT ); Tue, 17 Jul 2018 04:05:08 -0400 Received: from bmailout2.hostsharing.net ([83.223.90.240]:57783 "EHLO bmailout2.hostsharing.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728031AbeGQIFH (ORCPT ); Tue, 17 Jul 2018 04:05:07 -0400 Received: from h08.hostsharing.net (h08.hostsharing.net [83.223.95.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.hostsharing.net", Issuer "COMODO RSA Domain Validation Secure Server CA" (not verified)) by bmailout2.hostsharing.net (Postfix) with ESMTPS id BA97F2801088B; Tue, 17 Jul 2018 09:33:52 +0200 (CEST) Received: by h08.hostsharing.net (Postfix, from userid 100393) id 655726F3B3; Tue, 17 Jul 2018 09:33:52 +0200 (CEST) Date: Tue, 17 Jul 2018 09:33:52 +0200 From: Lukas Wunner To: Lyude Paul Cc: nouveau@lists.freedesktop.org, Archit Taneja , David Airlie , dri-devel@lists.freedesktop.org, Maarten Lankhorst , linux-kernel@vger.kernel.org, Ben Skeggs , Ville =?iso-8859-1?Q?Syrj=E4l=E4?= Subject: Re: [Nouveau] [PATCH v2 2/3] drm/nouveau: Fix runtime PM leak in nv50_disp_atomic_commit() Message-ID: <20180717073352.GA17459@wunner.de> References: <20180712170256.13018-1-lyude@redhat.com> <20180712170256.13018-3-lyude@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180712170256.13018-3-lyude@redhat.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 12, 2018 at 01:02:53PM -0400, Lyude Paul wrote: > --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c > +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c > @@ -1878,7 +1878,7 @@ nv50_disp_atomic_commit(struct drm_device *dev, > nv50_disp_atomic_commit_tail(state); > > drm_for_each_crtc(crtc, dev) { > - if (crtc->state->enable) { > + if (crtc->state->active) { > if (!drm->have_disp_power_ref) { > drm->have_disp_power_ref = true; > return 0; Somewhat tangential comment on this older patch, since you continue to dig around in the runtime PM area: Whenever a crtc is activated or deactivated in nouveau, we iterate over all crtcs and acquire a runtime PM if a crtc is active and previously there was no active one, or we drop a ref if none is active and previously there was an active one. For a while now I've been thinking that it would be more straightforward to acquire a ref whenever a crtc is activated and drop one when a crtc is deactivated, i.e. hold one ref for every active crtc. That way the have_disp_power_ref variable as well as the iteration logic could be removed, leading to a simplification. Just a suggestion anyway. Thanks, Lukas