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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C416C433F5 for ; Mon, 8 Nov 2021 10:15:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 452C6610F8 for ; Mon, 8 Nov 2021 10:15:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238572AbhKHKSA (ORCPT ); Mon, 8 Nov 2021 05:18:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38594 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238595AbhKHKPU (ORCPT ); Mon, 8 Nov 2021 05:15:20 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 39F46C061208 for ; Mon, 8 Nov 2021 02:12:29 -0800 (PST) Received: from zn.tnic (p200300ec2f33110088892b77bd117736.dip0.t-ipconnect.de [IPv6:2003:ec:2f33:1100:8889:2b77:bd11:7736]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id CE3381EC0505; Mon, 8 Nov 2021 11:12:27 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1636366347; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PzOPuLscGxVueOEHDmBojbj7Lh0Tq2B/QQr/AISfS/c=; b=qtAqqdfn1THtPBwyPZBq12j9u2vAbZjxAt+6yxyE6OsirMpQ47UK4gYN2Hdp58Xs7J05iN bh8/xOqrOsNaoECN9NUk8rTbTEwlObG73wNNX5+feEHN8t6ey1S5Lbq0smyNfQ8aH18olT eyPeR84afp74lzjxI/CpNOdws01/YgY= From: Borislav Petkov To: LKML Cc: linux-um@lists.infradead.org Subject: [PATCH v0 25/42] arch/um: Check notifier registration return value Date: Mon, 8 Nov 2021 11:11:40 +0100 Message-Id: <20211108101157.15189-26-bp@alien8.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20211108101157.15189-1-bp@alien8.de> References: <20211108101157.15189-1-bp@alien8.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Borislav Petkov Avoid homegrown notifier registration checks. No functional changes. Signed-off-by: Borislav Petkov Cc: linux-um@lists.infradead.org --- arch/um/drivers/mconsole_kern.c | 6 ++++-- arch/um/kernel/um_arch.c | 5 +++-- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c index 6ead1e240457..ceea940c0aa0 100644 --- a/arch/um/drivers/mconsole_kern.c +++ b/arch/um/drivers/mconsole_kern.c @@ -856,8 +856,10 @@ static struct notifier_block panic_exit_notifier = { static int add_notifier(void) { - atomic_notifier_chain_register(&panic_notifier_list, - &panic_exit_notifier); + if (atomic_notifier_chain_register(&panic_notifier_list, + &panic_exit_notifier)) + pr_warn("UM console panic notifier already registered\n"); + return 0; } diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c index 54447690de11..6c0e562ff0b7 100644 --- a/arch/um/kernel/um_arch.c +++ b/arch/um/kernel/um_arch.c @@ -255,8 +255,9 @@ static struct notifier_block panic_exit_notifier = { void uml_finishsetup(void) { - atomic_notifier_chain_register(&panic_notifier_list, - &panic_exit_notifier); + if (atomic_notifier_chain_register(&panic_notifier_list, + &panic_exit_notifier)) + pr_warn("UM panic notifier already registered\n"); uml_postsetup(); -- 2.29.2