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 8982FC4332F for ; Thu, 10 Nov 2022 17:48:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229499AbiKJRsJ (ORCPT ); Thu, 10 Nov 2022 12:48:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229567AbiKJRsI (ORCPT ); Thu, 10 Nov 2022 12:48:08 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C8EA3137C for ; Thu, 10 Nov 2022 09:48:07 -0800 (PST) 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 ams.source.kernel.org (Postfix) with ESMTPS id 0845CB8229B for ; Thu, 10 Nov 2022 17:48:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 613EDC433C1; Thu, 10 Nov 2022 17:48:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1668102484; bh=5DkUp/65jOa/tchtYj9ntP9Hst4WRvLw1Btz3Fmb0eA=; h=Subject:To:From:Date:From; b=aWMnrhzU9grUDJ7c7jj6zCHZMdGDzl/6DN81JkJKLEo87MWHk3Qvc3X+vzNZErzRA pdJW5+nmlyFd5+KKKEBt/IiYh5weDsTci/1s9lskoK26TBp4wBjkWeUDRs+SNLM90j PBA1MuGJlTMJ02eyFKCpR+x7c+s3sSF2Vr2BN9mY= Subject: patch "firmware: coreboot: Register bus in module init" added to char-misc-linus To: briannorris@chromium.org, gregkh@linuxfoundation.org, linux@roeck-us.net, stable@vger.kernel.org, swboyd@chromium.org From: Date: Thu, 10 Nov 2022 18:48:02 +0100 Message-ID: <166810248221043@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This is a note to let you know that I've just added the patch titled firmware: coreboot: Register bus in module init to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will hopefully also be merged in Linus's tree for the next -rc kernel release. If you have any questions about this process, please let me know. >From 65946690ed8d972fdb91a74ee75ac0f0f0d68321 Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Wed, 19 Oct 2022 18:10:53 -0700 Subject: firmware: coreboot: Register bus in module init The coreboot_table driver registers a coreboot bus while probing a "coreboot_table" device representing the coreboot table memory region. Probing this device (i.e., registering the bus) is a dependency for the module_init() functions of any driver for this bus (e.g., memconsole-coreboot.c / memconsole_driver_init()). With synchronous probe, this dependency works OK, as the link order in the Makefile ensures coreboot_table_driver_init() (and thus, coreboot_table_probe()) completes before a coreboot device driver tries to add itself to the bus. With asynchronous probe, however, coreboot_table_probe() may race with memconsole_driver_init(), and so we're liable to hit one of these two: 1. coreboot_driver_register() eventually hits "[...] the bus was not initialized.", and the memconsole driver fails to register; or 2. coreboot_driver_register() gets past #1, but still races with bus_register() and hits some other undefined/crashing behavior (e.g., in driver_find() [1]) We can resolve this by registering the bus in our initcall, and only deferring "device" work (scanning the coreboot memory region and creating sub-devices) to probe(). [1] Example failure, using 'driver_async_probe=*' kernel command line: [ 0.114217] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 ... [ 0.114307] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.1.0-rc1 #63 [ 0.114316] Hardware name: Google Scarlet (DT) ... [ 0.114488] Call trace: [ 0.114494] _raw_spin_lock+0x34/0x60 [ 0.114502] kset_find_obj+0x28/0x84 [ 0.114511] driver_find+0x30/0x50 [ 0.114520] driver_register+0x64/0x10c [ 0.114528] coreboot_driver_register+0x30/0x3c [ 0.114540] memconsole_driver_init+0x24/0x30 [ 0.114550] do_one_initcall+0x154/0x2e0 [ 0.114560] do_initcall_level+0x134/0x160 [ 0.114571] do_initcalls+0x60/0xa0 [ 0.114579] do_basic_setup+0x28/0x34 [ 0.114588] kernel_init_freeable+0xf8/0x150 [ 0.114596] kernel_init+0x2c/0x12c [ 0.114607] ret_from_fork+0x10/0x20 [ 0.114624] Code: 5280002b 1100054a b900092a f9800011 (885ffc01) [ 0.114631] ---[ end trace 0000000000000000 ]--- Fixes: b81e3140e412 ("firmware: coreboot: Make bus registration symmetric") Cc: Signed-off-by: Brian Norris Reviewed-by: Guenter Roeck Reviewed-by: Stephen Boyd Link: https://lore.kernel.org/r/20221019180934.1.If29e167d8a4771b0bf4a39c89c6946ed764817b9@changeid Signed-off-by: Greg Kroah-Hartman --- drivers/firmware/google/coreboot_table.c | 37 +++++++++++++++++++----- 1 file changed, 29 insertions(+), 8 deletions(-) diff --git a/drivers/firmware/google/coreboot_table.c b/drivers/firmware/google/coreboot_table.c index c52bcaa9def6..9ca21feb9d45 100644 --- a/drivers/firmware/google/coreboot_table.c +++ b/drivers/firmware/google/coreboot_table.c @@ -149,12 +149,8 @@ static int coreboot_table_probe(struct platform_device *pdev) if (!ptr) return -ENOMEM; - ret = bus_register(&coreboot_bus_type); - if (!ret) { - ret = coreboot_table_populate(dev, ptr); - if (ret) - bus_unregister(&coreboot_bus_type); - } + ret = coreboot_table_populate(dev, ptr); + memunmap(ptr); return ret; @@ -169,7 +165,6 @@ static int __cb_dev_unregister(struct device *dev, void *dummy) static int coreboot_table_remove(struct platform_device *pdev) { bus_for_each_dev(&coreboot_bus_type, NULL, NULL, __cb_dev_unregister); - bus_unregister(&coreboot_bus_type); return 0; } @@ -199,6 +194,32 @@ static struct platform_driver coreboot_table_driver = { .of_match_table = of_match_ptr(coreboot_of_match), }, }; -module_platform_driver(coreboot_table_driver); + +static int __init coreboot_table_driver_init(void) +{ + int ret; + + ret = bus_register(&coreboot_bus_type); + if (ret) + return ret; + + ret = platform_driver_register(&coreboot_table_driver); + if (ret) { + bus_unregister(&coreboot_bus_type); + return ret; + } + + return 0; +} + +static void __exit coreboot_table_driver_exit(void) +{ + platform_driver_unregister(&coreboot_table_driver); + bus_unregister(&coreboot_bus_type); +} + +module_init(coreboot_table_driver_init); +module_exit(coreboot_table_driver_exit); + MODULE_AUTHOR("Google, Inc."); MODULE_LICENSE("GPL"); -- 2.38.1