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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 D1BE4C433E0 for ; Mon, 15 Feb 2021 16:31:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8BB3064DFF for ; Mon, 15 Feb 2021 16:31:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230091AbhBOQbh (ORCPT ); Mon, 15 Feb 2021 11:31:37 -0500 Received: from mail.kernel.org ([198.145.29.99]:50206 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231362AbhBOPhS (ORCPT ); Mon, 15 Feb 2021 10:37:18 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id E923164E91; Mon, 15 Feb 2021 15:32:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1613403139; bh=6HQyKtEMhDLbf+qDArxqy3u2PczAa9UoihEXtMgT/VY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V3phEgCcs5Kh6TEoD98fPJCABghEFnNFXgu3AoJ87yrn/4ryT86iX/rmqgYCE7YKc LXEM6VeUR5wWgp7xvL/gHrNgZRHn3HUNwzEeaMn+2fYkS7csrbU+x8wJ5IjjO/RYMh /9hvBddSrmnUcj25d5xyjmfZ+unnejEZV7gWkgOc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ian Jackson , Julien Grall , David Woodhouse , Stefano Stabellini , Juergen Gross Subject: [PATCH 5.10 009/104] arm/xen: Dont probe xenbus as part of an early initcall Date: Mon, 15 Feb 2021 16:26:22 +0100 Message-Id: <20210215152719.767707000@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210215152719.459796636@linuxfoundation.org> References: <20210215152719.459796636@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Julien Grall commit c4295ab0b485b8bc50d2264bcae2acd06f25caaf upstream. After Commit 3499ba8198cad ("xen: Fix event channel callback via INTX/GSI"), xenbus_probe() will be called too early on Arm. This will recent to a guest hang during boot. If the hang wasn't there, we would have ended up to call xenbus_probe() twice (the second time is in xenbus_probe_initcall()). We don't need to initialize xenbus_probe() early for Arm guest. Therefore, the call in xen_guest_init() is now removed. After this change, there is no more external caller for xenbus_probe(). So the function is turned to a static one. Interestingly there were two prototypes for it. Cc: stable@vger.kernel.org Fixes: 3499ba8198cad ("xen: Fix event channel callback via INTX/GSI") Reported-by: Ian Jackson Signed-off-by: Julien Grall Reviewed-by: David Woodhouse Reviewed-by: Stefano Stabellini Link: https://lore.kernel.org/r/20210210170654.5377-1-julien@xen.org Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman --- arch/arm/xen/enlighten.c | 2 -- drivers/xen/xenbus/xenbus.h | 1 - drivers/xen/xenbus/xenbus_probe.c | 2 +- include/xen/xenbus.h | 2 -- 4 files changed, 1 insertion(+), 6 deletions(-) --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -370,8 +370,6 @@ static int __init xen_guest_init(void) return -ENOMEM; } gnttab_init(); - if (!xen_initial_domain()) - xenbus_probe(); /* * Making sure board specific code will not set up ops for --- a/drivers/xen/xenbus/xenbus.h +++ b/drivers/xen/xenbus/xenbus.h @@ -115,7 +115,6 @@ int xenbus_probe_node(struct xen_bus_typ const char *type, const char *nodename); int xenbus_probe_devices(struct xen_bus_type *bus); -void xenbus_probe(void); void xenbus_dev_changed(const char *node, struct xen_bus_type *bus); --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -683,7 +683,7 @@ void unregister_xenstore_notifier(struct } EXPORT_SYMBOL_GPL(unregister_xenstore_notifier); -void xenbus_probe(void) +static void xenbus_probe(void) { xenstored_ready = 1; --- a/include/xen/xenbus.h +++ b/include/xen/xenbus.h @@ -192,8 +192,6 @@ void xs_suspend_cancel(void); struct work_struct; -void xenbus_probe(void); - #define XENBUS_IS_ERR_READ(str) ({ \ if (!IS_ERR(str) && strlen(str) == 0) { \ kfree(str); \