From patchwork Fri Sep 13 10:07:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Kang Yang X-Patchwork-Id: 828655 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5A6B01BF80A for ; Fri, 13 Sep 2024 10:07:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726222077; cv=none; b=aiHLtzY1v2FcQC9wlH6ukYaDU8r5NkTfIM9CptMmKhepGSG0YJVvpAVsZmZMQknANPUMn4JN/PXwA+YhLypQvRqh6O2MAZ4VPdU3wpk4r8HkwJ6m6VfY0VdMzZ/CwXIydP5wZaKj3eCmultQ5FwttiCpKi9naotCGNgURye3Bq8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726222077; c=relaxed/simple; bh=QrGKwQALfykTkW8Q93AUBni0OBhn8/PQNH9Ust0nXvE=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=GmWc3MTwYmUzFS07yFL+4RpAIglWuxlp1xJXLkeonRost4SgJYsEnyZFENelMHNNk+ZobMdlB200wI78Gvcos9xF2Jji2/L7pbn9iA9O003gIZCqyXav4r/2FmoDpF1Oy30xQKPtkdgrgw8zJzk2RT+jNhRvJtqHVgD7YGAsSxI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=Zx8b4t4l; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="Zx8b4t4l" Received: from pps.filterd (m0279873.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 48DA4Bo3005742; Fri, 13 Sep 2024 10:07:45 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= gnwrLws4OWHxlaLvGkPQBd0E6bbarIwfSrfrfFxvOF0=; b=Zx8b4t4lYYGkvnDt qt3vgPW7d/zQZUARDRyKhOBe7T1HzCNkYcy4TlVPXDTH791bHIytuYAAbwhrkY/b ++3ph4OtA8Jc2/PLGLd13coHeHMd567rAppSBj8PActYxuIPYAaPFRfC7W+6RCCq vBV4PN6jSaK59AwvrRzNvsxWqAPK4VJnuBrDLQ8ev88a0h4DmrcsHaYSpGXVRTUd ql05o/HJ8d6s6vHx3/belMCNjNmNIeqRUNuek4ipiZnx0neTFeUn4oQ+zIdgK+Lh E7jZTPI93X5+bp5jmC1U5eYceU9Vb3PJQrLnwuKuVc/gnifm87trGVrSgs6Q0ICZ M5rfPg== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 41gy738fjs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 13 Sep 2024 10:07:45 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA02.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 48DA7iur014310 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 13 Sep 2024 10:07:44 GMT Received: from kangyang.ap.qualcomm.com (10.80.80.8) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Fri, 13 Sep 2024 03:07:42 -0700 From: Kang Yang To: CC: , Subject: [PATCH 1/2] wifi: ath11k: fix RCU stall while reaping monitor destination ring Date: Fri, 13 Sep 2024 18:07:07 +0800 Message-ID: <20240913100708.756-2-quic_kangyang@quicinc.com> X-Mailer: git-send-email 2.34.1.windows.1 In-Reply-To: <20240913100708.756-1-quic_kangyang@quicinc.com> References: <20240913100708.756-1-quic_kangyang@quicinc.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: O1kOXUH-ZqdQh2aydVVKE14EMN5-HArg X-Proofpoint-GUID: O1kOXUH-ZqdQh2aydVVKE14EMN5-HArg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 malwarescore=0 adultscore=0 mlxlogscore=999 suspectscore=0 priorityscore=1501 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2408220000 definitions=main-2409130070 From: P Praneesh While processing the monitor destination ring, MSDUs are reaped from the link descriptor based on the corresponding buf_id. However, sometimes the driver cannot obtain a valid buffer corresponding to the buf_id received from the hardware. This causes an infinite loop in the the link descriptor based on the corresponding buf_id. However, sometimes the driver cannot obtain a valid buffer corresponding to the buf_id received from the hardware. This causes an infinite loop in the destination processing, resulting in a kernel crash. kernel log: ath11k_pci 0000:58:00.0: data msdu_pop: invalid buf_id 309 ath11k_pci 0000:58:00.0: data dp_rx_monitor_link_desc_return failed ath11k_pci 0000:58:00.0: data msdu_pop: invalid buf_id 309 ath11k_pci 0000:58:00.0: data dp_rx_monitor_link_desc_return failed …… Fix this by skipping the problematic buf_id and reaping the next entry, replacing the break with the next MSDU processing. Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30 Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1 Signed-off-by: P Praneesh Signed-off-by: Kang Yang --- drivers/net/wireless/ath/ath11k/dp_rx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c index c087d8a0f5b2..072963d3396c 100644 --- a/drivers/net/wireless/ath/ath11k/dp_rx.c +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c @@ -4781,7 +4781,7 @@ ath11k_dp_rx_mon_mpdu_pop(struct ath11k *ar, int mac_id, if (!msdu) { ath11k_dbg(ar->ab, ATH11K_DBG_DATA, "msdu_pop: invalid buf_id %d\n", buf_id); - break; + goto next_msdu; } rxcb = ATH11K_SKB_RXCB(msdu); if (!rxcb->unmapped) { @@ -5405,7 +5405,7 @@ ath11k_dp_rx_full_mon_mpdu_pop(struct ath11k *ar, "full mon msdu_pop: invalid buf_id %d\n", buf_id); spin_unlock_bh(&rx_ring->idr_lock); - break; + goto next_msdu; } idr_remove(&rx_ring->bufs_idr, buf_id); spin_unlock_bh(&rx_ring->idr_lock);