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=-6.9 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=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 5B78CCA90AF for ; Wed, 13 May 2020 10:05:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2520E20575 for ; Wed, 13 May 2020 10:05:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589364329; bh=LwGn39lj7UslFGfZpnJKr1mv5ArhCasq226wWa4aPUg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=E9UH960MmCz0cBoQH+ckvylbNPaGsL9DRUdK29aXkEEThB0uTCsfMPv3r6s/jG3VW 9J2I0m2Lrfk9rjzjQlIE1uIdtBjh1lhk8YUe6bXXpvXrEh+Z0rHvGC6DOxF7NBmLPj ie9u+WZKu22UPT/lOfU9jMHwOtDHv+aWxUv0IBF0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732655AbgEMJqc (ORCPT ); Wed, 13 May 2020 05:46:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:43854 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732636AbgEMJq1 (ORCPT ); Wed, 13 May 2020 05:46:27 -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 D17C623128; Wed, 13 May 2020 09:46:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589363186; bh=LwGn39lj7UslFGfZpnJKr1mv5ArhCasq226wWa4aPUg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EO/EVrTQDyAaDDhl0YWzXDaT+pf44wwhVQw1OMKrLhnRkBoKOgmYundfWpc8V/uax bEGaDpPkoiNndZ6/kKPGw4fayQBjG34EfNgsLxydoumj2ga4EDbPxlgVNrhiYraQCZ 4yypOhJIgMWLUFNOPO4JUO5NoW5jMqm/VH08CikI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jason Gunthorpe , Tariq Toukan , "David S. Miller" Subject: [PATCH 4.19 07/48] net/mlx4_core: Fix use of ENOSPC around mlx4_counter_alloc() Date: Wed, 13 May 2020 11:44:33 +0200 Message-Id: <20200513094353.857327137@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200513094351.100352960@linuxfoundation.org> References: <20200513094351.100352960@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: Tariq Toukan [ Upstream commit 40e473071dbad04316ddc3613c3a3d1c75458299 ] When ENOSPC is set the idx is still valid and gets set to the global MLX4_SINK_COUNTER_INDEX. However gcc's static analysis cannot tell that ENOSPC is impossible from mlx4_cmd_imm() and gives this warning: drivers/net/ethernet/mellanox/mlx4/main.c:2552:28: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized] 2552 | priv->def_counter[port] = idx; Also, when ENOSPC is returned mlx4_allocate_default_counters should not fail. Fixes: 6de5f7f6a1fa ("net/mlx4_core: Allocate default counter per port") Signed-off-by: Jason Gunthorpe Signed-off-by: Tariq Toukan Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/mellanox/mlx4/main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/net/ethernet/mellanox/mlx4/main.c +++ b/drivers/net/ethernet/mellanox/mlx4/main.c @@ -2539,6 +2539,7 @@ static int mlx4_allocate_default_counter if (!err || err == -ENOSPC) { priv->def_counter[port] = idx; + err = 0; } else if (err == -ENOENT) { err = 0; continue; @@ -2589,7 +2590,8 @@ int mlx4_counter_alloc(struct mlx4_dev * MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED); if (!err) *idx = get_param_l(&out_param); - + if (WARN_ON(err == -ENOSPC)) + err = -EINVAL; return err; } return __mlx4_counter_alloc(dev, idx);