From patchwork Fri Jun 19 08:20:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 11613395 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2E7F692A for ; Fri, 19 Jun 2020 08:21:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 13ADC214D8 for ; Fri, 19 Jun 2020 08:21:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731358AbgFSIVI (ORCPT ); Fri, 19 Jun 2020 04:21:08 -0400 Received: from foss.arm.com ([217.140.110.172]:46940 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730983AbgFSIUl (ORCPT ); Fri, 19 Jun 2020 04:20:41 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 41F2813A1; Fri, 19 Jun 2020 01:20:40 -0700 (PDT) Received: from red-moon.arm.com (unknown [10.57.58.158]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BC9ED3F71F; Fri, 19 Jun 2020 01:20:37 -0700 (PDT) From: Lorenzo Pieralisi To: linux-arm-kernel@lists.infradead.org Cc: Lorenzo Pieralisi , Will Deacon , Hanjun Guo , Sudeep Holla , Catalin Marinas , Robin Murphy , "Rafael J. Wysocki" , iommu@lists.linux-foundation.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org, linux-pci@vger.kernel.org, Rob Herring , Joerg Roedel , Bjorn Helgaas , Marc Zyngier , Makarand Pawagi , Diana Craciun , Laurentiu Tudor Subject: [PATCH v2 04/12] ACPI/IORT: Remove useless PCI bus walk Date: Fri, 19 Jun 2020 09:20:05 +0100 Message-Id: <20200619082013.13661-5-lorenzo.pieralisi@arm.com> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200619082013.13661-1-lorenzo.pieralisi@arm.com> References: <20200521130008.8266-1-lorenzo.pieralisi@arm.com> <20200619082013.13661-1-lorenzo.pieralisi@arm.com> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The PCI bus domain number (used in the iort_match_node_callback() - pci_domain_nr() call) is cascaded through the PCI bus hierarchy at PCI bus enumeration time, therefore there is no need in iort_find_dev_node() to walk the PCI bus upwards to grab the root bus to be passed to iort_scan_node(), the device->bus PCI bus pointer will do. Remove this useless code. Signed-off-by: Lorenzo Pieralisi Cc: Will Deacon Cc: Hanjun Guo Cc: Sudeep Holla Cc: Catalin Marinas Cc: Robin Murphy Cc: "Rafael J. Wysocki" --- drivers/acpi/arm64/iort.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 53f9ef515089..421c6976ab81 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -558,10 +558,7 @@ static struct acpi_iort_node *iort_find_dev_node(struct device *dev) iort_match_node_callback, dev); } - /* Find a PCI root bus */ pbus = to_pci_dev(dev)->bus; - while (!pci_is_root_bus(pbus)) - pbus = pbus->parent; return iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX, iort_match_node_callback, &pbus->dev);