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=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,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 E5FC9C282DD for ; Thu, 23 May 2019 19:25:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B9D8C217D7 for ; Thu, 23 May 2019 19:25:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558639521; bh=LtAw2JPeh35qAaYGeZsx8jGPw5if8EhsDrE/tt2wK5k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=eiFRWyC2qwhl5KlPdBiStEvvwcqm0HEpL23YvT7JVFA8jFmzLu+BqovqChsESfeYP f5un922MpyYI4fS/WahI/Cas/GgX6YA2zf/0osoT377uNDrSodasilzPgvXpy276yN HrdZhlKxv9Q8wvt+xDk+9WEZleyZ8oLHf7eEHoFg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391076AbfEWTZV (ORCPT ); Thu, 23 May 2019 15:25:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:36580 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391055AbfEWTZL (ORCPT ); Thu, 23 May 2019 15:25:11 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 944902184E; Thu, 23 May 2019 19:25:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558639511; bh=LtAw2JPeh35qAaYGeZsx8jGPw5if8EhsDrE/tt2wK5k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2OHFkfg46zr+lRvvKVqoFeBj1X1VpynvEc0NVd9DiiP1P8DtiBkYyM8G5fhworlUU PUNh08FCajfnprafcj8FQmxQlhVRl3ZZgCzxu0vhAMwLxJhSLvJMdbwb0bvTfdWyaX Z7J1L3onzOJ+WZmGXW9mU+wofCSTmfQALaZuXc34= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Logan Gunthorpe , Bjorn Helgaas , Sasha Levin Subject: [PATCH 5.0 115/139] PCI: Fix issue with "pci=disable_acs_redir" parameter being ignored Date: Thu, 23 May 2019 21:06:43 +0200 Message-Id: <20190523181734.807123874@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190523181720.120897565@linuxfoundation.org> References: <20190523181720.120897565@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit d5bc73f34cc97c4b4b9202cc93182c2515076edf ] In most cases, kmalloc() will not be available early in boot when pci_setup() is called. Thus, the kstrdup() call that was added to fix the __initdata bug with the disable_acs_redir parameter usually returns NULL, so the parameter is discarded and has no effect. To fix this, store the string that's in initdata until an initcall function can allocate the memory appropriately. This way we don't need any additional static memory. Fixes: d2fd6e81912a ("PCI: Fix __initdata issue with "pci=disable_acs_redir" parameter") Signed-off-by: Logan Gunthorpe Signed-off-by: Bjorn Helgaas Signed-off-by: Sasha Levin --- drivers/pci/pci.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e91005d0f20c7..3f77bab698ced 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -6266,8 +6266,7 @@ static int __init pci_setup(char *str) } else if (!strncmp(str, "pcie_scan_all", 13)) { pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS); } else if (!strncmp(str, "disable_acs_redir=", 18)) { - disable_acs_redir_param = - kstrdup(str + 18, GFP_KERNEL); + disable_acs_redir_param = str + 18; } else { printk(KERN_ERR "PCI: Unknown option `%s'\n", str); @@ -6278,3 +6277,19 @@ static int __init pci_setup(char *str) return 0; } early_param("pci", pci_setup); + +/* + * 'disable_acs_redir_param' is initialized in pci_setup(), above, to point + * to data in the __initdata section which will be freed after the init + * sequence is complete. We can't allocate memory in pci_setup() because some + * architectures do not have any memory allocation service available during + * an early_param() call. So we allocate memory and copy the variable here + * before the init section is freed. + */ +static int __init pci_realloc_setup_params(void) +{ + disable_acs_redir_param = kstrdup(disable_acs_redir_param, GFP_KERNEL); + + return 0; +} +pure_initcall(pci_realloc_setup_params); -- 2.20.1