From patchwork Tue Sep 3 13:24:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joao Martins X-Patchwork-Id: 11127869 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4410914E5 for ; Tue, 3 Sep 2019 13:25:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 246DB23711 for ; Tue, 3 Sep 2019 13:25:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="WeeYkWVp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729425AbfICNZT (ORCPT ); Tue, 3 Sep 2019 09:25:19 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:41590 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729392AbfICNZR (ORCPT ); Tue, 3 Sep 2019 09:25:17 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x83DOBP5048240; Tue, 3 Sep 2019 13:25:03 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type : content-transfer-encoding; s=corp-2019-08-05; bh=qv8voy15J0vDwU5XKrHvG6gwYjAjx6li7t3EIYvElEU=; b=WeeYkWVp3yhIf6PElEXi0hqWcsoYlkJvd5o+7ATzhAfpje+vFzM31IK9Yd0P8+trzCjO ju8YAFoRHqIqiH5V/xtN2xU7qK8YbvA5Zzgby68jxGXo0QO1QPjXCxOM/iNdIn/aHEA6 VCWoqtoWZ01XZw0tWbiZ8+KB1g1HdcQ5CMKyqLRh0bgEDW50SMXhhehWO+bETfCSZI+i 54pHzRsLAzwFZOA4oujPuwyZCmenute0Gccgm3v3LwwDzGXrtEZLNPS0uNOMNaTSstDg YGvpN3VQno66WrbyUFvXI3AgXc7QWpPX37x0Lxl+VLJwphM3qKRrdO+LWMiw0aDt2OOg Jg== Received: from aserp3020.oracle.com (aserp3020.oracle.com [141.146.126.70]) by aserp2120.oracle.com with ESMTP id 2usrvcg353-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 03 Sep 2019 13:25:03 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x83DOFM3129252; Tue, 3 Sep 2019 13:25:02 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3020.oracle.com with ESMTP id 2us5pguu4n-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 03 Sep 2019 13:25:02 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x83DP1rq017032; Tue, 3 Sep 2019 13:25:01 GMT Received: from paddy.uk.oracle.com (/10.175.205.235) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 03 Sep 2019 06:25:01 -0700 From: Joao Martins To: linux-pm@vger.kernel.org Cc: Joao Martins , "Rafael J. Wysocki" , Daniel Lezcano , linux-kernel@vger.kernel.org, Marcelo Tosatti , kvm@vger.kernel.org Subject: [PATCH v2 3/4] cpuidle-haltpoll: return -ENODEV on modinit failure Date: Tue, 3 Sep 2019 14:24:43 +0100 Message-Id: <20190903132444.11808-4-joao.m.martins@oracle.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190903132444.11808-1-joao.m.martins@oracle.com> References: <20190903132444.11808-1-joao.m.martins@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9368 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=884 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909030142 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9368 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=942 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909030142 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org When a user loads cpuidle-haltpoll on a non KVM guest the module will successfully load, even though idle driver registration didn't take place. We should instead return -ENODEV signaling the user that the driver can't be loaded, like other error paths in haltpoll_init(). An example of such error paths is when we return -EBUSY when attempting to register an idle driver when it had one already (e.g. intel_idle loads at boot and then we attempt to insert module cpuidle-haltpoll). Fixes: fa86ee90eb11 ("add cpuidle-haltpoll driver") Signed-off-by: Joao Martins --- v2: * Add missing Fixes tag --- drivers/cpuidle/cpuidle-haltpoll.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cpuidle/cpuidle-haltpoll.c b/drivers/cpuidle/cpuidle-haltpoll.c index 519e90d125cf..7a0239ef717e 100644 --- a/drivers/cpuidle/cpuidle-haltpoll.c +++ b/drivers/cpuidle/cpuidle-haltpoll.c @@ -99,7 +99,7 @@ static int __init haltpoll_init(void) cpuidle_poll_state_init(drv); if (!kvm_para_available()) - return 0; + return -ENODEV; ret = cpuidle_register_driver(drv); if (ret < 0)