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Fri, 13 Dec 2024 09:39:39 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 Dec 2024 01:39:37 -0800 From: Kang Yang To: CC: , Subject: [PATCH v4 1/2] wifi: ath11k: move update channel list from update reg worker to reg notifier Date: Fri, 13 Dec 2024 17:39:08 +0800 Message-ID: <20241213093909.629-2-quic_kangyang@quicinc.com> X-Mailer: git-send-email 2.34.1.windows.1 In-Reply-To: <20241213093909.629-1-quic_kangyang@quicinc.com> References: <20241213093909.629-1-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-GUID: kjJiGrGKKzk1wEWz0n8S4d7Q3HQrSwcH X-Proofpoint-ORIG-GUID: kjJiGrGKKzk1wEWz0n8S4d7Q3HQrSwcH 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 spamscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 malwarescore=0 mlxlogscore=999 priorityscore=1501 bulkscore=0 phishscore=0 mlxscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412130065 From: Wen Gong Currently when ath11k gets new channel list, it will mainly do two things in ath11k_regd_update(): 1. update channel list to cfg80211 by reg_work. 2. update cfg80211's channel list to firmware by ath11k_reg_update_chan_list(). Flow: ath11k_regd_update ->regulatory_set_wiphy_regd -> schedule_work(®_work) ->reg_work->reg_process_self_managed_hint ->handle_band_custom(update to cfg80211) -> ath11k_reg_update_chan_list(update to firmware) But ath11k_reg_update_chan_list() is immediately called after reg_work is queued. They are running in different threads. At this time, ath11k_reg_update_chan_list() may use a wrong channel list because handle_band_custom() may not be finished. This may result in out-of-bounds write errors: BUG: KASAN: slab-out-of-bounds in ath11k_reg_update_chan_list Call Trace: ath11k_reg_update_chan_list+0xbfe/0xfe0 [ath11k] kfree+0x109/0x3a0 ath11k_regd_update+0x1cf/0x350 [ath11k] ath11k_regd_update_work+0x14/0x20 [ath11k] process_one_work+0xe35/0x14c0 So should make sure ath11k_reg_update_chan_list() is called after handle_band_custom() is finished. reg_process_self_managed_hint() will call reg_call_notifier() after handle_band_custom(). This function will call ath11k_reg_notifier(), so move ath11k_reg_update_chan_list() to ath11k_reg_notifier(). Then ath11k can update correct channel list to firmware. Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3 Fixes: f45cb6b29cd3 ("wifi: ath11k: avoid deadlock during regulatory update in ath11k_regd_update()") Signed-off-by: Wen Gong Signed-off-by: Kang Yang --- drivers/net/wireless/ath/ath11k/reg.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/reg.c b/drivers/net/wireless/ath/ath11k/reg.c index b0f289784dd3..cb2cf9b63d18 100644 --- a/drivers/net/wireless/ath/ath11k/reg.c +++ b/drivers/net/wireless/ath/ath11k/reg.c @@ -55,6 +55,19 @@ ath11k_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request) ath11k_dbg(ar->ab, ATH11K_DBG_REG, "Regulatory Notification received for %s\n", wiphy_name(wiphy)); + if (request->initiator == NL80211_REGDOM_SET_BY_DRIVER) { + ath11k_dbg(ar->ab, ATH11K_DBG_REG, + "driver initiated regd update\n"); + if (ar->state != ATH11K_STATE_ON) + return; + + ret = ath11k_reg_update_chan_list(ar, true); + if (ret) + ath11k_warn(ar->ab, "failed to update channel list: %d\n", ret); + + return; + } + /* Currently supporting only General User Hints. Cell base user * hints to be handled later. * Hints from other sources like Core, Beacons are not expected for @@ -293,12 +306,6 @@ int ath11k_regd_update(struct ath11k *ar) if (ret) goto err; - if (ar->state == ATH11K_STATE_ON) { - ret = ath11k_reg_update_chan_list(ar, true); - if (ret) - goto err; - } - return 0; err: ath11k_warn(ab, "failed to perform regd update : %d\n", ret); @@ -977,6 +984,7 @@ void ath11k_regd_update_work(struct work_struct *work) void ath11k_reg_init(struct ath11k *ar) { ar->hw->wiphy->regulatory_flags = REGULATORY_WIPHY_SELF_MANAGED; + ar->hw->wiphy->flags |= WIPHY_FLAG_NOTIFY_REGDOM_BY_DRIVER; ar->hw->wiphy->reg_notifier = ath11k_reg_notifier; }