From patchwork Wed Aug 30 02:11:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baochen Qiang X-Patchwork-Id: 719418 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E4FDEC83F12 for ; Wed, 30 Aug 2023 02:12:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241662AbjH3CMS (ORCPT ); Tue, 29 Aug 2023 22:12:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37972 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236624AbjH3CLv (ORCPT ); Tue, 29 Aug 2023 22:11:51 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2850D1AE for ; Tue, 29 Aug 2023 19:11:49 -0700 (PDT) Received: from pps.filterd (m0279862.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 37U1Ubmu015968; Wed, 30 Aug 2023 02:11:46 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=Duu9okkbYfP9xoqLhr72dovNWVSGEARPq0KAlwVjnu0=; b=Abqv0Rm+B9u1Nz7GgVAcV1i5AbvqsA4SDlQAlA/7uAjceQSJdmyf2S3R4MtvCHtf5SQo ww2LHOQ0CkE5LN6LGN0SteNedBOY6wb049VlvJ/Dhp8oCVNdZ6FH0QEZV71LzT/LODrO cEeIch4OwpdUUsDrjS6FqKTas/3GbmlrNVZLJ6UhroS/2WA0trB+T2NSMJxdfkBLWTj3 DO4x95ZH3SmSAiLuH9m7eXQ1AEgJC66PVQfy+RNXqNgswmXuucXWPGsnkYwx3MqjZVPz AYE9do+nXYU6yLsTRBmZRs/RPZgG/TZ2U2ZeHxEZp9g/Aq26Ho3xMcUjq41YbAOoAVWN 5Q== Received: from nalasppmta04.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3ssv0y02ed-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 30 Aug 2023 02:11:46 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 37U2BkhP030533 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 30 Aug 2023 02:11:46 GMT Received: from bqiang-SFF.qca.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.36; Tue, 29 Aug 2023 19:11:44 -0700 From: Baochen Qiang To: CC: Subject: [PATCH] wifi: ath12k: fix DMA unmap warning on NULL DMA address Date: Wed, 30 Aug 2023 10:11:31 +0800 Message-ID: <20230830021131.5610-1-quic_bqiang@quicinc.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: aqECxv9xe0WoVowN3lVlxuWlFknInZkW X-Proofpoint-ORIG-GUID: aqECxv9xe0WoVowN3lVlxuWlFknInZkW X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-08-29_16,2023-08-29_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 phishscore=0 mlxlogscore=650 suspectscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 mlxscore=0 spamscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2308300018 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org In ath12k_dp_tx(), if we reach fail_dma_unmap due to some errors, current code does DMA unmap unconditionally on skb_cb->paddr_ext_desc. However, skb_cb->paddr_ext_desc may be NULL and thus we get below warning: kernel: [ 8887.076212] WARNING: CPU: 3 PID: 0 at drivers/iommu/dma-iommu.c:1077 iommu_dma_unmap_page+0x79/0x90 Fix it by checking skb_cb->paddr_ext_desc before unmap it. Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices") Signed-off-by: Baochen Qiang --- drivers/net/wireless/ath/ath12k/dp_tx.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) base-commit: a62b0aeb556839fb6abb9835874443b08fe95598 diff --git a/drivers/net/wireless/ath/ath12k/dp_tx.c b/drivers/net/wireless/ath/ath12k/dp_tx.c index 8874c815d7fa..c0ae2fd443cc 100644 --- a/drivers/net/wireless/ath/ath12k/dp_tx.c +++ b/drivers/net/wireless/ath/ath12k/dp_tx.c @@ -330,8 +330,10 @@ int ath12k_dp_tx(struct ath12k *ar, struct ath12k_vif *arvif, fail_unmap_dma: dma_unmap_single(ab->dev, ti.paddr, ti.data_len, DMA_TO_DEVICE); - dma_unmap_single(ab->dev, skb_cb->paddr_ext_desc, - sizeof(struct hal_tx_msdu_ext_desc), DMA_TO_DEVICE); + if (skb_cb->paddr_ext_desc) + dma_unmap_single(ab->dev, skb_cb->paddr_ext_desc, + sizeof(struct hal_tx_msdu_ext_desc), + DMA_TO_DEVICE); fail_remove_tx_buf: ath12k_dp_tx_release_txbuf(dp, tx_desc, pool_id);