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=-17.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 18BA5C4338F for ; Fri, 13 Aug 2021 16:03:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E63DE6109D for ; Fri, 13 Aug 2021 16:03:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241152AbhHMQD0 (ORCPT ); Fri, 13 Aug 2021 12:03:26 -0400 Received: from mail-oo1-f44.google.com ([209.85.161.44]:41592 "EHLO mail-oo1-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236895AbhHMQDZ (ORCPT ); Fri, 13 Aug 2021 12:03:25 -0400 Received: by mail-oo1-f44.google.com with SMTP id f33-20020a4a89240000b029027c19426fbeso2936316ooi.8 for ; Fri, 13 Aug 2021 09:02:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=igXLnd1eISg2P0hGoYZnUOJKTMPuxVIxAZpu/coMklo=; b=pZ0WgpOHNFQq4FOyZqRHtUkNDX9ujEUjkEr/mURGVci1dppTENYrumfy60l4HLFL/w UNMEiGBAuGuxmU/4yfWqhzK80UtK7UC/buYI7YqrUt+qn6xEuY7CQyOpmp/Zc3MwZ+Sy 15OJaKWkZEY5WOGIQTcceIJajAA5fqMrvGqsY192hEvrcqP2Qhy+55nb828ybwKXgvAt dbRON2/yuLJ8sYKF6V1iZim9fhi/T+KU2iEL5SN+rwhjmwXiaR3SmWLTHFFrgORdh+T/ dSQpCoKbkR+icrg2F1TUPLq0rrrTotx0nNSP1b/pWV5s9h0/CYQl1AosLjonF/bjVszC zKYA== X-Gm-Message-State: AOAM5333HLzmON3HRaIliihzKtRtMWteVlRbLLsNi9xVoiJELEjXC1I6 lON3B/GT72NVIrWVx3JBsw== X-Google-Smtp-Source: ABdhPJxiB3tr1hTNXtMRt4s0i4ZTXw15nplCz2EbiuxYKNJ3IXT2f+h5fbf6BhiK8/w5RqphdsmTIA== X-Received: by 2002:a05:6820:305:: with SMTP id l5mr2347123ooe.21.1628870578477; Fri, 13 Aug 2021 09:02:58 -0700 (PDT) Received: from xps15.herring.priv (24-155-109-49.dyn.grandenetworks.net. [24.155.109.49]) by smtp.googlemail.com with ESMTPSA id w13sm389995otl.41.2021.08.13.09.02.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Aug 2021 09:02:57 -0700 (PDT) From: Rob Herring To: Mauro Carvalho Chehab Cc: linux-pci@vger.kernel.org, Marc Zyngier , Bjorn Helgaas , Lorenzo Pieralisi Subject: [PATCH] PCI: of: Fix MSI domain lookup with child bus nodes Date: Fri, 13 Aug 2021 11:02:57 -0500 Message-Id: <20210813160257.3570515-1-robh@kernel.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org When a DT contains PCI child bus nodes, lookup of the MSI domain on PCI buses fails resulting in the following warnings: WARNING: CPU: 4 PID: 7 at include/linux/msi.h:256 __pci_enable_msi_range+0x398/0x59c The issue is that pci_host_bridge_of_msi_domain() will check the DT node of the passed in bus even if it's not the host bridge's bus. Based on the name of the function, that's clearly not what we want. Fix this by walking the bus parents to the root bus. Reported-by: Mauro Carvalho Chehab Cc: Marc Zyngier Cc: Bjorn Helgaas Cc: Lorenzo Pieralisi Signed-off-by: Rob Herring --- Compile tested only. Mauro, Can you see if this fixes your issue. drivers/pci/of.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pci/of.c b/drivers/pci/of.c index a143b02b2dcd..ea70aede054c 100644 --- a/drivers/pci/of.c +++ b/drivers/pci/of.c @@ -84,6 +84,10 @@ struct irq_domain *pci_host_bridge_of_msi_domain(struct pci_bus *bus) if (!bus->dev.of_node) return NULL; + /* Find the host bridge bus */ + while (!pci_is_root_bus(bus)) + bus = bus->parent; + /* Start looking for a phandle to an MSI controller. */ d = of_msi_get_domain(&bus->dev, bus->dev.of_node, DOMAIN_BUS_PCI_MSI); if (d) -- 2.30.2