From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 3A0EAA046B for ; Tue, 23 Jul 2019 12:40:40 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 43A591BFD0; Tue, 23 Jul 2019 12:40:39 +0200 (CEST) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by dpdk.org (Postfix) with ESMTP id A60991BFCF; Tue, 23 Jul 2019 12:40:36 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 23 Jul 2019 03:40:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,298,1559545200"; d="scan'208";a="368332987" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by fmsmga005.fm.intel.com with ESMTP; 23 Jul 2019 03:40:34 -0700 To: Andrew Rybchenko , Thomas Monjalon Cc: dev@dpdk.org, stable@dpdk.org References: <1563873208-5096-1-git-send-email-arybchenko@solarflare.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1563873208-5096-1-git-send-email-arybchenko@solarflare.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH] ethdev: avoid usage of uninit device info in bad port case X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 7/23/2019 10:13 AM, Andrew Rybchenko wrote: > rte_eth_dev_info_get() returns void and caller does know if the function > does its job or not. Changing of the return value to int would be > API/ABI breakage which requires deprecation process and cannot be > backported to stable branches. For now, make sure that device info is > initialized even in the case of invalid port ID. +1 to return a status from function for long term. But someone looks below code can think we are doing an unnecessary memset for the error case, and will fix it :) What do you think adding a comment to prevent this? > > Fixes: a30268e9a2d0 ("ethdev: reset whole dev info structure before filling") > Cc: stable@dpdk.org > > Signed-off-by: Andrew Rybchenko > --- > lib/librte_ethdev/rte_ethdev.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c > index 64191737c..97b093edc 100644 > --- a/lib/librte_ethdev/rte_ethdev.c > +++ b/lib/librte_ethdev/rte_ethdev.c > @@ -2552,10 +2552,11 @@ rte_eth_dev_info_get(uint16_t port_id, struct rte_eth_dev_info *dev_info) > .nb_mtu_seg_max = UINT16_MAX, > }; > > + memset(dev_info, 0, sizeof(struct rte_eth_dev_info)); > + > RTE_ETH_VALID_PORTID_OR_RET(port_id); > dev = &rte_eth_devices[port_id]; > > - memset(dev_info, 0, sizeof(struct rte_eth_dev_info)); > dev_info->rx_desc_lim = lim; > dev_info->tx_desc_lim = lim; > dev_info->device = dev->device; >