From patchwork Wed Jul 6 06:15:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jisheng Zhang X-Patchwork-Id: 9215473 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 882FF60752 for ; Wed, 6 Jul 2016 06:21:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7883D286EE for ; Wed, 6 Jul 2016 06:21:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6D3DF286F0; Wed, 6 Jul 2016 06:21:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0A5F2286EE for ; Wed, 6 Jul 2016 06:21:49 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bKgCG-0005SC-8b; Wed, 06 Jul 2016 06:20:32 +0000 Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bKgC4-00046k-BS for linux-arm-kernel@lists.infradead.org; Wed, 06 Jul 2016 06:20:20 +0000 Received: from pps.filterd (m0045851.ppops.net [127.0.0.1]) by mx0b-0016f401.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u666Hq95027877; Tue, 5 Jul 2016 23:19:47 -0700 Received: from sc-exch02.marvell.com ([199.233.58.182]) by mx0b-0016f401.pphosted.com with ESMTP id 23xd4fy8fx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Tue, 05 Jul 2016 23:19:47 -0700 Received: from SC-EXCH03.marvell.com (10.93.176.83) by SC-EXCH02.marvell.com (10.93.176.82) with Microsoft SMTP Server (TLS) id 15.0.1104.5; Tue, 5 Jul 2016 23:19:45 -0700 Received: from maili.marvell.com (10.93.176.43) by SC-EXCH03.marvell.com (10.93.176.83) with Microsoft SMTP Server id 15.0.1104.5 via Frontend Transport; Tue, 5 Jul 2016 23:19:45 -0700 Received: from xhacker.marvell.com (shsp-lt4.marvell.com [10.37.130.124]) by maili.marvell.com (Postfix) with ESMTP id 109573F7040; Tue, 5 Jul 2016 23:19:44 -0700 (PDT) From: Jisheng Zhang To: , , , Subject: [PATCH v4 1/2] ARM: cpuidle: fix !cpuidle_ops[cpu].init case during init Date: Wed, 6 Jul 2016 14:15:54 +0800 Message-ID: <1467785755-3488-2-git-send-email-jszhang@marvell.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1467785755-3488-1-git-send-email-jszhang@marvell.com> References: <1467785755-3488-1-git-send-email-jszhang@marvell.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-07-06_03:, , signatures=0 X-Proofpoint-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1607060057 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160705_232020_568283_1F2EDFE5 X-CRM114-Status: GOOD ( 12.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jisheng Zhang , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Let's assume cpuidle_ops exists but it doesn't implement the according init callback, current arm_cpuidle_init() will return success to its caller, but in fact it should return -EOPNOTSUPP. Signed-off-by: Jisheng Zhang Acked-by: Daniel Lezcano --- arch/arm/kernel/cpuidle.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/arch/arm/kernel/cpuidle.c b/arch/arm/kernel/cpuidle.c index a44b268e..2129b29 100644 --- a/arch/arm/kernel/cpuidle.c +++ b/arch/arm/kernel/cpuidle.c @@ -92,7 +92,8 @@ static const struct cpuidle_ops *__init arm_cpuidle_get_ops(const char *method) * process. * * Return 0 on sucess, -ENOENT if no 'enable-method' is defined, -EOPNOTSUPP if - * no cpuidle_ops is registered for the 'enable-method'. + * no cpuidle_ops is registered for the 'enable-method', or if no init callback + * is defined. */ static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu) { @@ -110,6 +111,12 @@ static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu) return -EOPNOTSUPP; } + if (!ops->init) { + pr_warn("cpuidle_ops '%s': no init callback\n", + enable_method); + return -EOPNOTSUPP; + } + cpuidle_ops[cpu] = *ops; /* structure copy */ pr_notice("cpuidle: enable-method property '%s'" @@ -129,7 +136,8 @@ static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu) * Returns: * 0 on success, * -ENODEV if it fails to find the cpu node in the device tree, - * -EOPNOTSUPP if it does not find a registered cpuidle_ops for this cpu, + * -EOPNOTSUPP if it does not find a registered and valid cpuidle_ops for + * this cpu, * -ENOENT if it fails to find an 'enable-method' property, * -ENXIO if the HW reports a failure or a misconfiguration, * -ENOMEM if the HW report an memory allocation failure @@ -143,7 +151,7 @@ int __init arm_cpuidle_init(int cpu) return -ENODEV; ret = arm_cpuidle_read_ops(cpu_node, cpu); - if (!ret && cpuidle_ops[cpu].init) + if (!ret) ret = cpuidle_ops[cpu].init(cpu_node, cpu); of_node_put(cpu_node);