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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 431B8C5519F for ; Thu, 12 Nov 2020 22:10:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA2B022201 for ; Thu, 12 Nov 2020 22:10:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727605AbgKLWKl (ORCPT ); Thu, 12 Nov 2020 17:10:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727584AbgKLWKl (ORCPT ); Thu, 12 Nov 2020 17:10:41 -0500 Received: from viti.kaiser.cx (viti.kaiser.cx [IPv6:2a01:238:43fe:e600:cd0c:bd4a:7a3:8e9f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 639A0C0613D1; Thu, 12 Nov 2020 14:10:41 -0800 (PST) Received: from dslb-094-219-035-190.094.219.pools.vodafone-ip.de ([94.219.35.190] helo=martin-debian-2.paytec.ch) by viti.kaiser.cx with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1kdKnU-0003X9-R4; Thu, 12 Nov 2020 23:10:28 +0100 From: Martin Kaiser To: Bjorn Helgaas , Thomas Gleixner , Ley Foon Tan , Lorenzo Pieralisi , Nicolas Saenz Julienne , Jingoo Han , Gustavo Pimentel , Toan Le , Florian Fainelli Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Martin Kaiser Subject: [PATCH v3 3/3] PCI: xgene-msi: Fix race in installing chained irq handler Date: Thu, 12 Nov 2020 23:10:10 +0100 Message-Id: <20201112221010.9473-3-martin@kaiser.cx> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201112221010.9473-1-martin@kaiser.cx> References: <20201108191140.23227-1-martin@kaiser.cx> <20201112221010.9473-1-martin@kaiser.cx> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Fix a race where a pending interrupt could be received and the handler called before the handler's data has been setup, by converting to irq_set_chained_handler_and_data(). See also 2cf5a03cb29d ("PCI/keystone: Fix race in installing chained IRQ handler"). Based on the mail discussion, it seems ok to drop the error handling. Link: https://lore.kernel.org/linux-pci/87h7pumo9l.fsf@nanos.tec.linutronix.de/T/#m6d3288531114ada1378b41538ef73fef451f1441 Signed-off-by: Martin Kaiser --- drivers/pci/controller/pci-xgene-msi.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/pci/controller/pci-xgene-msi.c b/drivers/pci/controller/pci-xgene-msi.c index 2470782cb01a..1c34c897a7e2 100644 --- a/drivers/pci/controller/pci-xgene-msi.c +++ b/drivers/pci/controller/pci-xgene-msi.c @@ -384,13 +384,9 @@ static int xgene_msi_hwirq_alloc(unsigned int cpu) if (!msi_group->gic_irq) continue; - irq_set_chained_handler(msi_group->gic_irq, - xgene_msi_isr); - err = irq_set_handler_data(msi_group->gic_irq, msi_group); - if (err) { - pr_err("failed to register GIC IRQ handler\n"); - return -EINVAL; - } + irq_set_chained_handler_and_data(msi_group->gic_irq, + xgene_msi_isr, msi_group); + /* * Statically allocate MSI GIC IRQs to each CPU core. * With 8-core X-Gene v1, 2 MSI GIC IRQs are allocated -- 2.20.1