From patchwork Tue Feb 7 01:41:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saravana Kannan X-Patchwork-Id: 651503 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 2D4DDC64EC6 for ; Tue, 7 Feb 2023 01:42:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230355AbjBGBm2 (ORCPT ); Mon, 6 Feb 2023 20:42:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230326AbjBGBm0 (ORCPT ); Mon, 6 Feb 2023 20:42:26 -0500 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 72A8D16AC7 for ; Mon, 6 Feb 2023 17:42:16 -0800 (PST) Received: by mail-pg1-x549.google.com with SMTP id az7-20020a056a02004700b004ec117e57cfso5928006pgb.5 for ; Mon, 06 Feb 2023 17:42:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=rF935xJruDmZakfcqYl07qySBy4v0tdY/SRPeseRpYs=; b=nVLihGug+gPNpky+kL8lZ+ojXplNGe2YAeogfY96aFh2Qm/Qk1O3o22nE2SbLQGizJ IQUGcIv0V1RiPC3mFC95Ns51BBCdycBZmzZp1eBZeHMb3hEEexERUn9/qygKgFkVNpb0 Diq/OdiPdmE0e1Mvqy6mPGaGFUAI0qc+AzilSeGTt20pgttfB2UI6oxiuR9XlQq9Felm iClxVp1dKr/FoyJc+rxT9XgQscF8UCsnjjVVGve0zIcTwL+GUrEfoISySe93O475VMth fWwpZNaXC0o8y1s1tvJPiWtm14hX9OdBngkkg5kHlfY9ArsLQ75uwryzy35mTFf3XSiq xXfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=rF935xJruDmZakfcqYl07qySBy4v0tdY/SRPeseRpYs=; b=FkGiLb9PORMuNp67p6d9/1QMth/rTzqTIGoiJsNeDlTJbTDEUDMePdDCF/Q5IsJIM0 z8npWe98WgPssf6jiBeEuxcVQreWw8hMxmoZVSwksQcAdOq5AZIF0fXpiREbutKUlHU5 EwGEZ1J77Zix69ysuG/knbm4FvAulTDqDte+gqbdhGAK8+vWbxve1EhrDihYov2+d/fY FSvxPeWaqidNIX2JcAF1VNS5YZ7F/H3oJNYL1osgOgLwmvyOsg5u0qLY6ijRlraDmsc9 1mG1TVyZlcQAwPNi+d83ZlTMzeIJ93r9MqqZM79qmaakSzW8UDSj7NSTa1Mm7vawsKS/ 7GXA== X-Gm-Message-State: AO0yUKWSyRo/FU1tm4H/ipQ6dbO3oOjeKYt9jMtSPATzwOrNfE6poPff T0tjhlGUYvN4J0Lgz015Jp3AESufAuzFbtk= X-Google-Smtp-Source: AK7set9i7jgE6FpR3noUhzo8MnwFszLcteNew7Oyn7nbowkMqjNTsdQ07Wf9bCz+hy9cTEgusCXLrQQHzICPoq0= X-Received: from saravanak.san.corp.google.com ([2620:15c:2d:3:ae1:aba6:f21c:4a94]) (user=saravanak job=sendgmr) by 2002:a63:7114:0:b0:476:f69c:2304 with SMTP id m20-20020a637114000000b00476f69c2304mr169807pgc.77.1675734135795; Mon, 06 Feb 2023 17:42:15 -0800 (PST) Date: Mon, 6 Feb 2023 17:41:54 -0800 In-Reply-To: <20230207014207.1678715-1-saravanak@google.com> Message-Id: <20230207014207.1678715-3-saravanak@google.com> Mime-Version: 1.0 References: <20230207014207.1678715-1-saravanak@google.com> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog Subject: [PATCH v3 02/12] driver core: fw_devlink: Improve check for fwnode with no device/driver From: Saravana Kannan To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Sudeep Holla , Cristian Marussi , Linus Walleij , Bartosz Golaszewski , Thomas Gleixner , Marc Zyngier , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Frank Rowand , Geert Uytterhoeven , Magnus Damm , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Saravana Kannan , " =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= " Cc: Abel Vesa , Alexander Stein , Tony Lindgren , Geert Uytterhoeven , John Stultz , Doug Anderson , Guenter Roeck , Dmitry Baryshkov , Maxim Kiselev , Maxim Kochetkov , Luca Weiss , Colin Foster , Martin Kepplinger , Jean-Philippe Brucker , Vladimir Oltean , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org fw_devlink shouldn't defer the probe of a device to wait on a supplier that'll never have a struct device or will never be probed by a driver. We currently check if a supplier falls into this category, but don't check its ancestors. We need to check the ancestors too because if the ancestor will never probe, then the supplier will never probe either. Signed-off-by: Saravana Kannan Tested-by: Colin Foster Tested-by: Sudeep Holla --- drivers/base/core.c | 40 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 001e1914858d..368bfd96b511 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1867,6 +1867,35 @@ static int fw_devlink_relax_cycle(struct device *con, void *sup) return ret; } +static bool fwnode_init_without_drv(struct fwnode_handle *fwnode) +{ + struct device *dev; + bool ret; + + if (!(fwnode->flags & FWNODE_FLAG_INITIALIZED)) + return false; + + dev = get_dev_from_fwnode(fwnode); + ret = !dev || dev->links.status == DL_DEV_NO_DRIVER; + put_device(dev); + + return ret; +} + +static bool fwnode_ancestor_init_without_drv(struct fwnode_handle *fwnode) +{ + struct fwnode_handle *parent; + + fwnode_for_each_parent_node(fwnode, parent) { + if (fwnode_init_without_drv(parent)) { + fwnode_handle_put(parent); + return true; + } + } + + return false; +} + /** * fw_devlink_create_devlink - Create a device link from a consumer to fwnode * @con: consumer device for the device link @@ -1948,9 +1977,16 @@ static int fw_devlink_create_devlink(struct device *con, goto out; } - /* Supplier that's already initialized without a struct device. */ - if (sup_handle->flags & FWNODE_FLAG_INITIALIZED) + /* + * Supplier or supplier's ancestor already initialized without a struct + * device or being probed by a driver. + */ + if (fwnode_init_without_drv(sup_handle) || + fwnode_ancestor_init_without_drv(sup_handle)) { + dev_dbg(con, "Not linking %pfwP - Might never probe\n", + sup_handle); return -EINVAL; + } /* * DL_FLAG_SYNC_STATE_ONLY doesn't block probing and supports