From patchwork Thu Jun 9 13:47:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 12875639 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 4960BCCA480 for ; Thu, 9 Jun 2022 14:21:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245115AbiFIOV1 (ORCPT ); Thu, 9 Jun 2022 10:21:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47248 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343514AbiFIOVG (ORCPT ); Thu, 9 Jun 2022 10:21:06 -0400 Received: from cloudserver094114.home.pl (cloudserver094114.home.pl [79.96.170.134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92A112D517B; Thu, 9 Jun 2022 07:21:03 -0700 (PDT) Received: from localhost (127.0.0.1) (HELO v370.home.net.pl) by /usr/run/smtp (/usr/run/postfix/private/idea_relay_lmtp) via UNIX with SMTP (IdeaSmtpServer 5.0.0) id afc6eb5538d362a9; Thu, 9 Jun 2022 16:21:01 +0200 Received: from kreacher.localnet (unknown [213.134.186.232]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by v370.home.net.pl (Postfix) with ESMTPSA id 0ADA866C7D8; Thu, 9 Jun 2022 16:21:00 +0200 (CEST) From: "Rafael J. Wysocki" To: Linux ACPI Cc: LKML , Linux PM , Andy Shevchenko , Mika Westerberg , Hans de Goede , Sakari Ailus Subject: [PATCH v1 01/16] ACPI: glue: Use acpi_dev_for_each_child() Date: Thu, 09 Jun 2022 15:47:54 +0200 Message-ID: <13056549.uLZWGnKmhe@kreacher> In-Reply-To: <1843211.tdWV9SEqCh@kreacher> References: <1843211.tdWV9SEqCh@kreacher> MIME-Version: 1.0 X-CLIENT-IP: 213.134.186.232 X-CLIENT-HOSTNAME: 213.134.186.232 X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvfedruddtledgjeduucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffqoffgrffnpdggtffipffknecuuegrihhlohhuthemucduhedtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvfevufffkfgjfhgggfgtsehtufertddttdejnecuhfhrohhmpedftfgrfhgrvghlucflrdcuhgihshhotghkihdfuceorhhjfiesrhhjfiihshhotghkihdrnhgvtheqnecuggftrfgrthhtvghrnhepvdffueeitdfgvddtudegueejtdffteetgeefkeffvdeftddttdeuhfegfedvjefhnecukfhppedvudefrddufeegrddukeeirddvfedvnecuvehluhhsthgvrhfuihiivgepudenucfrrghrrghmpehinhgvthepvddufedrudefgedrudekiedrvdefvddphhgvlhhopehkrhgvrggthhgvrhdrlhhotggrlhhnvghtpdhmrghilhhfrhhomhepfdftrghfrggvlhculfdrucghhihsohgtkhhifdcuoehrjhifsehrjhifhihsohgtkhhirdhnvghtqedpnhgspghrtghpthhtohepjedprhgtphhtthhopehlihhnuhigqdgrtghpihesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopehlihhnuhigqdhpmhesvhhgvghrrdhkvghrnhgvlhdrohhrghdprhgtphhtthhopegrnhgurhhihidrshhhvghvtghhvghnkhhosehlihhnuhigrdhi nhhtvghlrdgtohhmpdhrtghpthhtohepmhhikhgrrdifvghsthgvrhgsvghrgheslhhinhhugidrihhnthgvlhdrtghomhdprhgtphhtthhopehhuggvghhovgguvgesrhgvughhrghtrdgtohhmpdhrtghpthhtohepshgrkhgrrhhirdgrihhluhhssehlihhnuhigrdhinhhtvghlrdgtohhm X-DCC--Metrics: v370.home.net.pl 1024; Body=7 Fuz1=7 Fuz2=7 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Rafael J. Wysocki Instead of walking the list of children of an ACPI device directly, use acpi_dev_for_each_child() to carry out an action for all of the given ACPI device's children. This will help to eliminate the children list head from struct acpi_device as it is redundant and it is used in questionable ways in some places (in particular, locking is needed for walking the list pointed to it safely, but it is often missing). Signed-off-by: Rafael J. Wysocki --- drivers/acpi/glue.c | 103 +++++++++++++++++++++++++++++++--------------------- 1 file changed, 63 insertions(+), 40 deletions(-) Index: linux-pm/drivers/acpi/glue.c =================================================================== --- linux-pm.orig/drivers/acpi/glue.c +++ linux-pm/drivers/acpi/glue.c @@ -105,51 +105,74 @@ static int find_child_checks(struct acpi return FIND_CHILD_MAX_SCORE; } +struct find_child_walk_data { + struct acpi_device *adev; + u64 address; + int score; + bool check_children; +}; + +static int check_one_child(struct acpi_device *adev, void *data) +{ + struct find_child_walk_data *wd = data; + int score; + + if (!adev->pnp.type.bus_address || acpi_device_adr(adev) != wd->address) + return 0; + + if (!wd->adev) { + /* This is the first matching object. Save it and continue. */ + wd->adev = adev; + return 0; + } + + /* + * There is more than one matching device object with the same _ADR + * value. That really is unexpected, so we are kind of beyond the scope + * of the spec here. We have to choose which one to return, though. + * + * First, get the score for the previously found object and terminate + * the walk if it is maximum. + */ + if (!wd->score) { + score = find_child_checks(wd->adev, wd->check_children); + if (score == FIND_CHILD_MAX_SCORE) + return 1; + + wd->score = score; + } + /* + * Second, if the object that has just been found has a better score, + * replace the previously found one with it and terminate the walk if + * the new score is maximum. + */ + score = find_child_checks(adev, wd->check_children); + if (score > wd->score) { + wd->adev = adev; + if (score == FIND_CHILD_MAX_SCORE) + return 1; + + wd->score = score; + } + + /* Continue, because there may be better matches. */ + return 0; +} + struct acpi_device *acpi_find_child_device(struct acpi_device *parent, u64 address, bool check_children) { - struct acpi_device *adev, *ret = NULL; - int ret_score = 0; + struct find_child_walk_data wd = { + .address = address, + .check_children = check_children, + .adev = NULL, + .score = 0, + }; - if (!parent) - return NULL; + if (parent) + acpi_dev_for_each_child(parent, check_one_child, &wd); - list_for_each_entry(adev, &parent->children, node) { - acpi_bus_address addr = acpi_device_adr(adev); - int score; - - if (!adev->pnp.type.bus_address || addr != address) - continue; - - if (!ret) { - /* This is the first matching object. Save it. */ - ret = adev; - continue; - } - /* - * There is more than one matching device object with the same - * _ADR value. That really is unexpected, so we are kind of - * beyond the scope of the spec here. We have to choose which - * one to return, though. - * - * First, check if the previously found object is good enough - * and return it if so. Second, do the same for the object that - * we've just found. - */ - if (!ret_score) { - ret_score = find_child_checks(ret, check_children); - if (ret_score == FIND_CHILD_MAX_SCORE) - return ret; - } - score = find_child_checks(adev, check_children); - if (score == FIND_CHILD_MAX_SCORE) { - return adev; - } else if (score > ret_score) { - ret = adev; - ret_score = score; - } - } - return ret; + return wd.adev; } EXPORT_SYMBOL_GPL(acpi_find_child_device);