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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 35BF2C77B75 for ; Mon, 8 May 2023 10:45:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234876AbjEHKpN (ORCPT ); Mon, 8 May 2023 06:45:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47624 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234942AbjEHKot (ORCPT ); Mon, 8 May 2023 06:44:49 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 245FA2C3F2 for ; Mon, 8 May 2023 03:43:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id ADBE462878 for ; Mon, 8 May 2023 10:43:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98272C433EF; Mon, 8 May 2023 10:43:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683542603; bh=YKs2xlajF6rMfHTq4lvzYc6WKpfFDkhKdQbPBTqa+4Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=juJNpWXCi5M7saT2nD1lfOc9uaQyQVJcIBEzG6v+yFFKy/Epyb75Q/AF93UlpDSGK /yc6OyX1OGc+U2dJd2Bah8vZ+DJrmFE70jO/rCclNJuTNgw2KNBvnv+JIbVB6Erxxx 36RUX/R5vz88Jt0Sj1KDaJynFoccXzE3Mi6ym9mo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "H. Nikolaus Schaller" , Lorenzo Pieralisi , Richard Zhu , Sasha Levin Subject: [PATCH 6.2 456/663] PCI: imx6: Install the fault handler only on compatible match Date: Mon, 8 May 2023 11:44:42 +0200 Message-Id: <20230508094442.910255981@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094428.384831245@linuxfoundation.org> References: <20230508094428.384831245@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: H. Nikolaus Schaller [ Upstream commit 5f5ac460dfe7f4e11f99de9870f240e39189cf72 ] commit bb38919ec56e ("PCI: imx6: Add support for i.MX6 PCIe controller") added a fault hook to this driver in the probe function. So it was only installed if needed. commit bde4a5a00e76 ("PCI: imx6: Allow probe deferral by reset GPIO") moved it from probe to driver init which installs the hook unconditionally as soon as the driver is compiled into a kernel. When this driver is compiled as a module, the hook is not registered until after the driver has been matched with a .compatible and loaded. commit 415b6185c541 ("PCI: imx6: Fix config read timeout handling") extended the fault handling code. commit 2d8ed461dbc9 ("PCI: imx6: Add support for i.MX8MQ") added some protection for non-ARM architectures, but this does not protect non-i.MX ARM architectures. Since fault handlers can be triggered on any architecture for different reasons, there is no guarantee that they will be triggered only for the assumed situation, leading to improper error handling (i.MX6-specific imx6q_pcie_abort_handler) on foreign systems. I had seen strange L3 imprecise external abort messages several times on OMAP4 and OMAP5 devices and couldn't make sense of them until I realized they were related to this unused imx6q driver because I had CONFIG_PCI_IMX6=y. Note that CONFIG_PCI_IMX6=y is useful for kernel binaries that are designed to run on different ARM SoC and be differentiated only by device tree binaries. So turning off CONFIG_PCI_IMX6 is not a solution. Therefore we check the compatible in the init function before registering the fault handler. Link: https://lore.kernel.org/r/e1bcfc3078c82b53aa9b78077a89955abe4ea009.1678380991.git.hns@goldelico.com Fixes: bde4a5a00e76 ("PCI: imx6: Allow probe deferral by reset GPIO") Fixes: 415b6185c541 ("PCI: imx6: Fix config read timeout handling") Fixes: 2d8ed461dbc9 ("PCI: imx6: Add support for i.MX8MQ") Signed-off-by: H. Nikolaus Schaller Signed-off-by: Lorenzo Pieralisi Reviewed-by: Richard Zhu Signed-off-by: Sasha Levin --- drivers/pci/controller/dwc/pci-imx6.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 1dde5c579edc8..47db2d20568ef 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -1402,6 +1402,13 @@ DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_SYNOPSYS, 0xabcd, static int __init imx6_pcie_init(void) { #ifdef CONFIG_ARM + struct device_node *np; + + np = of_find_matching_node(NULL, imx6_pcie_of_match); + if (!np) + return -ENODEV; + of_node_put(np); + /* * Since probe() can be deferred we need to make sure that * hook_fault_code is not called after __init memory is freed -- 2.39.2