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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB7BBC77B71 for ; Wed, 12 Apr 2023 08:52:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231366AbjDLIwF (ORCPT ); Wed, 12 Apr 2023 04:52:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231367AbjDLIwC (ORCPT ); Wed, 12 Apr 2023 04:52:02 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F0223900A; Wed, 12 Apr 2023 01:51:37 -0700 (PDT) Received: from pendragon.ideasonboard.com (133-32-181-51.west.xps.vectant.ne.jp [133.32.181.51]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id EA022616E; Wed, 12 Apr 2023 10:50:31 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1681289432; bh=P9omQNjGcS98ijd1kM117+6oifyx6ZMzbf6istyRB4g=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Fd33A+4wt3y/33SzfS4z5h7/h/wcRGcdvwjMJyAze3ctbDteoo/NRvI5UySQHI5tc o1prKtHhFq2S77Iwuu35OJET47uY+nL2q4CL/D6zttYHOoDgwQGRvT+/tzwFvOB4Cx 0IxMAwS6Ug5VaiZNyAtzWetyj5o7oCxXHgLcVYkg= Date: Wed, 12 Apr 2023 11:50:44 +0300 From: Laurent Pinchart To: Tony Lindgren Cc: Tomi Valkeinen , David Airlie , Daniel Vetter , Sebastian Reichel , dri-devel@lists.freedesktop.org, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] drm/omap: dsi: Fix deferred probe warnings Message-ID: <20230412085044.GP11253@pendragon.ideasonboard.com> References: <20230412073954.20601-1-tony@atomide.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20230412073954.20601-1-tony@atomide.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Tony, Thank you for the patch. On Wed, Apr 12, 2023 at 10:39:53AM +0300, Tony Lindgren wrote: > We may not have dsi->dsidev initialized during probe, and that can > lead into various dsi related warnings as omap_dsi_host_detach() gets > called with dsi->dsidev set to NULL. > > The warnings can be "Fixed dependency cycle(s)" followed by a > WARNING: CPU: 0 PID: 787 at drivers/gpu/drm/omapdrm/dss/dsi.c:4414. How can this happen ? I assume .detach() can't be called without a priori successful call to .attach(), that that sets dsi->dsidev. > Let's fix the warnings by checking for a valid dsi->dsidev. > > Signed-off-by: Tony Lindgren > --- > drivers/gpu/drm/omapdrm/dss/dsi.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c > --- a/drivers/gpu/drm/omapdrm/dss/dsi.c > +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c > @@ -4411,7 +4411,7 @@ static int omap_dsi_host_detach(struct mipi_dsi_host *host, > { > struct dsi_data *dsi = host_to_omap(host); > > - if (WARN_ON(dsi->dsidev != client)) > + if (dsi->dsidev && WARN_ON(dsi->dsidev != client)) > return -EINVAL; > > cancel_delayed_work_sync(&dsi->dsi_disable_work); -- Regards, Laurent Pinchart