From patchwork Mon Mar 9 18:18:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andre Przywara X-Patchwork-Id: 222817 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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 C29BEC10F27 for ; Mon, 9 Mar 2020 18:19:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A7EB521927 for ; Mon, 9 Mar 2020 18:19:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727498AbgCISTM (ORCPT ); Mon, 9 Mar 2020 14:19:12 -0400 Received: from foss.arm.com ([217.140.110.172]:55694 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727484AbgCISTL (ORCPT ); Mon, 9 Mar 2020 14:19:11 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A326F139F; Mon, 9 Mar 2020 11:19:10 -0700 (PDT) Received: from donnerap.arm.com (donnerap.cambridge.arm.com [10.1.197.25]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 54EE53F67D; Mon, 9 Mar 2020 11:19:09 -0700 (PDT) From: Andre Przywara To: "David S . Miller" , Radhey Shyam Pandey Cc: Michal Simek , Robert Hancock , netdev@vger.kernel.org, rmk+kernel@arm.linux.org.uk, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Andrew Lunn Subject: [PATCH v2 05/14] net: axienet: Improve DMA error handling Date: Mon, 9 Mar 2020 18:18:42 +0000 Message-Id: <20200309181851.190164-6-andre.przywara@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200309181851.190164-1-andre.przywara@arm.com> References: <20200309181851.190164-1-andre.przywara@arm.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Since 0 is a valid DMA address, we cannot use the physical address to check whether a TX descriptor is valid and is holding a DMA mapping. Use the "cntrl" member of the descriptor to make this decision, as it contains at least the length of the buffer, so 0 points to an uninitialised buffer. Signed-off-by: Andre Przywara Reviewed-by: Radhey Shyam Pandey --- drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c index 9903205d57ec..77235f86d758 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c @@ -571,7 +571,7 @@ static void axienet_start_xmit_done(struct net_device *ndev) DMA_TO_DEVICE); if (cur_p->skb) dev_consume_skb_irq(cur_p->skb); - /*cur_p->phys = 0;*/ + cur_p->cntrl = 0; cur_p->app0 = 0; cur_p->app1 = 0; cur_p->app2 = 0; @@ -1559,7 +1559,7 @@ static void axienet_dma_err_handler(struct work_struct *work) for (i = 0; i < lp->tx_bd_num; i++) { cur_p = &lp->tx_bd_v[i]; - if (cur_p->phys) + if (cur_p->cntrl) dma_unmap_single(ndev->dev.parent, cur_p->phys, (cur_p->cntrl & XAXIDMA_BD_CTRL_LENGTH_MASK),