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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 86536C2BB55 for ; Thu, 16 Apr 2020 14:38:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5B4D12063A for ; Thu, 16 Apr 2020 14:38:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587047935; bh=vZKMLH6+87IUjMNrup5IggY1o+3zzdiZAgU3UikVZlw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=i6do7xnlfYWuqSvJ1wKd89GAdN3HEA3ET3o5UiIWyMw3mUXnBhTd1rqyVVf0cXpoi 68E8MXX1i89HK8J6c2wpaBd9+qOsIwI33sjTHdxtawagJU+3Ux7GEnwaLaYoyHMksX AFgptXv8dJuJ2QbXqQ+rL29+m12DirX8se+07L90= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728055AbgDPOiy (ORCPT ); Thu, 16 Apr 2020 10:38:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:49938 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409647AbgDPOC0 (ORCPT ); Thu, 16 Apr 2020 10:02:26 -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 9761F2078B; Thu, 16 Apr 2020 14:02:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587045746; bh=vZKMLH6+87IUjMNrup5IggY1o+3zzdiZAgU3UikVZlw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=owGHh+LpTJdhAAMlyPBDyUdeEMuuxUMF8KXFiu7emx/nYXbCY6jIbrI9PYlt3DBEY Aa3JOPvRqT59vdgiKiAQ0iEQbIurD5VABX6jymoyni14a5GD09bOOtyVEheONwAZId SxaR/jeUCRgUddAUFbNiC1DfMZq6Lwp4M7PRtmhI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Wen Yang , Corey Minyard , Arnd Bergmann , openipmi-developer@lists.sourceforge.net, Corey Minyard Subject: [PATCH 5.6 232/254] ipmi: fix hung processes in __get_guid() Date: Thu, 16 Apr 2020 15:25:21 +0200 Message-Id: <20200416131354.620404362@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131325.804095985@linuxfoundation.org> References: <20200416131325.804095985@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 From: Wen Yang commit 32830a0534700f86366f371b150b17f0f0d140d7 upstream. The wait_event() function is used to detect command completion. When send_guid_cmd() returns an error, smi_send() has not been called to send data. Therefore, wait_event() should not be used on the error path, otherwise it will cause the following warning: [ 1361.588808] systemd-udevd D 0 1501 1436 0x00000004 [ 1361.588813] ffff883f4b1298c0 0000000000000000 ffff883f4b188000 ffff887f7e3d9f40 [ 1361.677952] ffff887f64bd4280 ffffc90037297a68 ffffffff8173ca3b ffffc90000000010 [ 1361.767077] 00ffc90037297ad0 ffff887f7e3d9f40 0000000000000286 ffff883f4b188000 [ 1361.856199] Call Trace: [ 1361.885578] [] ? __schedule+0x23b/0x780 [ 1361.951406] [] schedule+0x36/0x80 [ 1362.010979] [] get_guid+0x118/0x150 [ipmi_msghandler] [ 1362.091281] [] ? prepare_to_wait_event+0x100/0x100 [ 1362.168533] [] ipmi_register_smi+0x405/0x940 [ipmi_msghandler] [ 1362.258337] [] try_smi_init+0x529/0x950 [ipmi_si] [ 1362.334521] [] ? std_irq_setup+0xd0/0xd0 [ipmi_si] [ 1362.411701] [] init_ipmi_si+0x492/0x9e0 [ipmi_si] [ 1362.487917] [] ? ipmi_pci_probe+0x280/0x280 [ipmi_si] [ 1362.568219] [] do_one_initcall+0x50/0x180 [ 1362.636109] [] ? kmem_cache_alloc_trace+0x142/0x190 [ 1362.714330] [] do_init_module+0x5f/0x200 [ 1362.781208] [] load_module+0x1898/0x1de0 [ 1362.848069] [] ? __symbol_put+0x60/0x60 [ 1362.913886] [] ? security_kernel_post_read_file+0x6b/0x80 [ 1362.998514] [] SYSC_finit_module+0xe5/0x120 [ 1363.068463] [] ? SYSC_finit_module+0xe5/0x120 [ 1363.140513] [] SyS_finit_module+0xe/0x10 [ 1363.207364] [] do_syscall_64+0x74/0x180 Fixes: 50c812b2b951 ("[PATCH] ipmi: add full sysfs support") Signed-off-by: Wen Yang Cc: Corey Minyard Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Cc: openipmi-developer@lists.sourceforge.net Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org # 2.6.17- Message-Id: <20200403090408.58745-1-wenyang@linux.alibaba.com> Signed-off-by: Corey Minyard Signed-off-by: Greg Kroah-Hartman --- drivers/char/ipmi/ipmi_msghandler.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/char/ipmi/ipmi_msghandler.c +++ b/drivers/char/ipmi/ipmi_msghandler.c @@ -3188,8 +3188,8 @@ static void __get_guid(struct ipmi_smi * if (rv) /* Send failed, no GUID available. */ bmc->dyn_guid_set = 0; - - wait_event(intf->waitq, bmc->dyn_guid_set != 2); + else + wait_event(intf->waitq, bmc->dyn_guid_set != 2); /* dyn_guid_set makes the guid data available. */ smp_rmb();