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Mon, 22 Apr 2024 07:38:30 GMT Received: from zijuhu-gv.qualcomm.com (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Mon, 22 Apr 2024 00:38:28 -0700 From: Zijun Hu To: , , CC: , , , , , Subject: [PATCH v5 2/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390 after disable then warm reboot Date: Mon, 22 Apr 2024 15:38:17 +0800 Message-ID: <1713771497-5733-3-git-send-email-quic_zijuhu@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1713771497-5733-1-git-send-email-quic_zijuhu@quicinc.com> References: <1713650800-29741-1-git-send-email-quic_zijuhu@quicinc.com> <1713771497-5733-1-git-send-email-quic_zijuhu@quicinc.com> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanex01a.na.qualcomm.com (10.52.223.231) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: HmVQdDldeRhvCo9FxVrL8ROFsP0_wpld X-Proofpoint-GUID: HmVQdDldeRhvCo9FxVrL8ROFsP0_wpld X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-04-22_04,2024-04-19_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 phishscore=0 mlxlogscore=867 mlxscore=0 suspectscore=0 adultscore=0 lowpriorityscore=0 malwarescore=0 impostorscore=0 spamscore=0 bulkscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2404010003 definitions=main-2404220034 From: Zijun Hu Commit 272970be3dab ("Bluetooth: hci_qca: Fix driver shutdown on closed serdev") will cause below regression issue: BT can't be enabled after below steps: cold boot -> enable BT -> disable BT -> warm reboot -> BT enable failure if property enable-gpios is not configured within DT|ACPI for QCA_QCA6390. The commit is to fix a use-after-free issue within qca_serdev_shutdown() during reboot, but also introduces this new issue regarding above steps since the VSC is not sent to reset controller during warm reboot. Fixed by sending the VSC to reset controller within qca_serdev_shutdown() once BT was ever enabled, and the use-after-free issue is also be fixed by this change since serdev is still opened when send to serdev. Fixes: 272970be3dab ("Bluetooth: hci_qca: Fix driver shutdown on closed serdev") Reported-by: Wren Turkal Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218726 Signed-off-by: Zijun Hu Tested-by: Wren Turkal --- drivers/bluetooth/hci_qca.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index 4079254fb1c8..fc027da98297 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -2439,13 +2439,12 @@ static void qca_serdev_shutdown(struct device *dev) struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev); struct hci_uart *hu = &qcadev->serdev_hu; struct hci_dev *hdev = hu->hdev; - struct qca_data *qca = hu->priv; const u8 ibs_wake_cmd[] = { 0xFD }; const u8 edl_reset_soc_cmd[] = { 0x01, 0x00, 0xFC, 0x01, 0x05 }; if (qcadev->btsoc_type == QCA_QCA6390) { - if (test_bit(QCA_BT_OFF, &qca->flags) || - !test_bit(HCI_RUNNING, &hdev->flags)) + if (test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks) || + hci_dev_test_flag(hdev, HCI_SETUP)) return; serdev_device_write_flush(serdev);