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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 A1264C004C9 for ; Tue, 7 May 2019 05:43:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 762AB20578 for ; Tue, 7 May 2019 05:43:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557207814; bh=FlCMi7O7nvmlmp2MPamvn8aAjMD0ugeFa6JxNhQe4es=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=EqI98iKEkCXvYuhOWIoQOHG6JYAuls4yyXTq0BbT1k7hHXcldcR1qKPrFhwdF++Pc +60NNBG7i/gTCeOc1ofmheBdRRLPjgdS4fZsiRhBTA8K4uj1CR9hEU40Ipxp07ni2g 6zCzssPdoqTAH8WouUKVCrGJZlqyE4xvz9nPoI4Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729738AbfEGFnd (ORCPT ); Tue, 7 May 2019 01:43:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:33852 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728835AbfEGFnH (ORCPT ); Tue, 7 May 2019 01:43:07 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 58BBB20675; Tue, 7 May 2019 05:43:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557207787; bh=FlCMi7O7nvmlmp2MPamvn8aAjMD0ugeFa6JxNhQe4es=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p7W7ZBkQ8r/egYmNniknUSzQHwNADue10oiEX+0AcELIUvsGYumcw7CpnktI3PHU4 SYegZn8j8KrFWAoS7uC73l9LBiPDeXPg6WRAjyTP8h10/yA3UFKJ/XFB+CCBb/j7IK uiltMBaJFd2xyXALsIRSrFVM7nD6+lM3Lx3d5So4= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Arnd Bergmann , Nathan Chancellor , Julian Wiedmann , "David S . Miller" , Sasha Levin , linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 3.18 08/10] s390: ctcm: fix ctcm_new_device error return code Date: Tue, 7 May 2019 01:42:44 -0400 Message-Id: <20190507054247.537-8-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190507054247.537-1-sashal@kernel.org> References: <20190507054247.537-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnd Bergmann [ Upstream commit 27b141fc234a3670d21bd742c35d7205d03cbb3a ] clang points out that the return code from this function is undefined for one of the error paths: ../drivers/s390/net/ctcm_main.c:1595:7: warning: variable 'result' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (priv->channel[direction] == NULL) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ../drivers/s390/net/ctcm_main.c:1638:9: note: uninitialized use occurs here return result; ^~~~~~ ../drivers/s390/net/ctcm_main.c:1595:3: note: remove the 'if' if its condition is always false if (priv->channel[direction] == NULL) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ../drivers/s390/net/ctcm_main.c:1539:12: note: initialize the variable 'result' to silence this warning int result; ^ Make it return -ENODEV here, as in the related failure cases. gcc has a known bug in underreporting some of these warnings when it has already eliminated the assignment of the return code based on some earlier optimization step. Reviewed-by: Nathan Chancellor Signed-off-by: Arnd Bergmann Signed-off-by: Julian Wiedmann Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/s390/net/ctcm_main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c index e056dd4fe44d..5526388f905e 100644 --- a/drivers/s390/net/ctcm_main.c +++ b/drivers/s390/net/ctcm_main.c @@ -1595,6 +1595,7 @@ static int ctcm_new_device(struct ccwgroup_device *cgdev) if (priv->channel[direction] == NULL) { if (direction == CTCM_WRITE) channel_free(priv->channel[CTCM_READ]); + result = -ENODEV; goto out_dev; } priv->channel[direction]->netdev = dev; -- 2.20.1