From patchwork Fri Dec 11 09:27:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Horman X-Patchwork-Id: 11967777 X-Patchwork-Delegate: kuba@kernel.org 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=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 DEAA2C4361B for ; Fri, 11 Dec 2020 09:29:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9885D23F57 for ; Fri, 11 Dec 2020 09:29:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405628AbgLKJ3E (ORCPT ); Fri, 11 Dec 2020 04:29:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54712 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404425AbgLKJ2f (ORCPT ); Fri, 11 Dec 2020 04:28:35 -0500 Received: from mail-ed1-x541.google.com (mail-ed1-x541.google.com [IPv6:2a00:1450:4864:20::541]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1752FC0613D3 for ; Fri, 11 Dec 2020 01:27:55 -0800 (PST) Received: by mail-ed1-x541.google.com with SMTP id h16so8611364edt.7 for ; Fri, 11 Dec 2020 01:27:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=netronome-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=3AQCc2YDUQGFyXvCYo88ngSH0tYmn2xNHP0sLvl7GHY=; b=klrDEP8SZlgLNUXz3zJpAxCLGz4SX3eGMehKPiLNX3LTW6/iIdYv0tc/CaWickbBdl nLBM003DAL4wPyFCozEoMOjKBXO1+VwN5/paBouGBkKwaKYfE1x6zar08idXhOBO80UU WkqZQVU/aAXYbiS07EsI5tpHwB6qcf1c5QG9jXY3qfkggvg2+Jm09+YOj7MX+cSbIeES ONIFbjAaINcCzPIY89dWq1STJVAmvbEwu8G5m1pmZ13kuleOoQZ74XJ0SdO24XnDfzG8 9nL5RD5Q5XAJlg1vYEz6m2qIClR4cTWZ2V7kq0cOGTOFtWup5ciMtphYtyP43Wkh/7B+ x2HQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=3AQCc2YDUQGFyXvCYo88ngSH0tYmn2xNHP0sLvl7GHY=; b=gM4fejMIJLRb0rIecQ3PSzDk2J+th331eZDV+X+LUKOhg1CzD1p1Uhd3ePXl5pooPf GiLtKSxac52ZfzOVzJKOpsPnQkYcadB8vwsL6EPOV8VSptlrP8Yg0n/e7PcR00lr7WBN d+ZuBWAYI0rKiIFynx1x1q1kSkMucAEudTnNjAAnDECtphv+bR5diduzddgxjyAUcbKg PeaDbINeoIk0J6JNGZQeDQERSAstNqLCSBuRCQR6XCwSfh1DfpkhKqn/GRQ57XYs+hAL dgipTn8onSkrkiTpHmLsvBXX2ZTUgKyrQ60jba1gPahDKQcImgJinsNzShBfFSWdHx7v zqqA== X-Gm-Message-State: AOAM530wX455bzB5nrrq5CZsJPEtFSRWPbDyQjmCdUzUB3BQ7s7OVk6A R5LWwq6APW7IMIFM9yNU9nz8mm/FA+Xf/w== X-Google-Smtp-Source: ABdhPJyxvwVqgZ8kKt4vvSnQVrY5/Gg1peOe2zJm5YIVF7diGRKtrPz2gWF0/bw3KLi3p1hhcDtgJg== X-Received: by 2002:a50:ac86:: with SMTP id x6mr10856558edc.197.1607678873814; Fri, 11 Dec 2020 01:27:53 -0800 (PST) Received: from madeliefje.horms.nl ([2001:982:7ed1:404:a2a4:c5ff:fe4c:9ce9]) by smtp.gmail.com with ESMTPSA id a20sm7314730edr.70.2020.12.11.01.27.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Dec 2020 01:27:52 -0800 (PST) From: Simon Horman To: David Miller Cc: Jakub Kicinski , Louis Peens , netdev@vger.kernel.org, oss-drivers@netronome.com, Simon Horman , wenxu Subject: [PATCH net] nfp: do not send control messages during cleanup Date: Fri, 11 Dec 2020 10:27:38 +0100 Message-Id: <20201211092738.3358-1-simon.horman@netronome.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org On cleanup the txbufs are freed before app cleanup. But app clean-up may result in control messages due to use of common control paths. There is no need to clean-up the NIC in such cases so simply discard requests. Without such a check a NULL pointer dereference occurs. Fixes: a1db217861f3 ("net: flow_offload: fix flow_indr_dev_unregister path") Cc: wenxu Signed-off-by: Simon Horman Signed-off-by: Louis Peens --- drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c index b4acf2f41e84..d86f68aa89bf 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c @@ -2084,6 +2084,15 @@ nfp_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, dp = &r_vec->nfp_net->dp; tx_ring = r_vec->tx_ring; + if (!tx_ring->txbufs) + /* On cleanup the txbufs are freed before app cleanup. + * But app clean-up may result in control messages due to + * use of common control paths. There is no need to + * clean-up the NIC in such cases so simply discard + * requests. + */ + goto err_free; + if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) { nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n"); goto err_free;