Merge tag 'for-net-2025-06-23' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth

Luiz Augusto von Dentz says:

====================
bluetooth pull request for net:

 - L2CAP: Fix L2CAP MTU negotiation
 - hci_core: Fix use-after-free in vhci_flush()
 - btintel_pcie: Fix potential race condition in firmware download
 - hci_qca: fix unable to load the BT driver

* tag 'for-net-2025-06-23' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth:
  Bluetooth: hci_core: Fix use-after-free in vhci_flush()
  driver: bluetooth: hci_qca:fix unable to load the BT driver
  Bluetooth: L2CAP: Fix L2CAP MTU negotiation
  Bluetooth: btintel_pcie: Fix potential race condition in firmware download
====================

Link: https://patch.msgid.link/20250623165405.227619-1-luiz.dentz@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

2 files changed, 41 insertions, 5 deletions

diff --git a/drivers/bluetooth/btintel_pcie.c b/drivers/bluetooth/btintel_pcie.c
index 563165c5efae..e1c688dd2d45 100644
--- a/drivers/bluetooth/btintel_pcie.c
+++ b/drivers/bluetooth/btintel_pcie.c
@@ -2033,6 +2033,28 @@ static void btintel_pcie_release_hdev(struct btintel_pcie_data *data)
 	data->hdev = NULL;
 }
 
+static void btintel_pcie_disable_interrupts(struct btintel_pcie_data *data)
+{
+	spin_lock(&data->irq_lock);
+	btintel_pcie_wr_reg32(data, BTINTEL_PCIE_CSR_MSIX_FH_INT_MASK, data->fh_init_mask);
+	btintel_pcie_wr_reg32(data, BTINTEL_PCIE_CSR_MSIX_HW_INT_MASK, data->hw_init_mask);
+	spin_unlock(&data->irq_lock);
+}
+
+static void btintel_pcie_enable_interrupts(struct btintel_pcie_data *data)
+{
+	spin_lock(&data->irq_lock);
+	btintel_pcie_wr_reg32(data, BTINTEL_PCIE_CSR_MSIX_FH_INT_MASK, ~data->fh_init_mask);
+	btintel_pcie_wr_reg32(data, BTINTEL_PCIE_CSR_MSIX_HW_INT_MASK, ~data->hw_init_mask);
+	spin_unlock(&data->irq_lock);
+}
+
+static void btintel_pcie_synchronize_irqs(struct btintel_pcie_data *data)
+{
+	for (int i = 0; i < data->alloc_vecs; i++)
+		synchronize_irq(data->msix_entries[i].vector);
+}
+
 static int btintel_pcie_setup_internal(struct hci_dev *hdev)
 {
 	struct btintel_pcie_data *data = hci_get_drvdata(hdev);
@@ -2152,6 +2174,8 @@ static int btintel_pcie_setup(struct hci_dev *hdev)
 		bt_dev_err(hdev, "Firmware download retry count: %d",
 			   fw_dl_retry);
 		btintel_pcie_dump_debug_registers(hdev);
+		btintel_pcie_disable_interrupts(data);
+		btintel_pcie_synchronize_irqs(data);
 		err = btintel_pcie_reset_bt(data);
 		if (err) {
 			bt_dev_err(hdev, "Failed to do shr reset: %d", err);
@@ -2159,6 +2183,7 @@ static int btintel_pcie_setup(struct hci_dev *hdev)
 		}
 		usleep_range(10000, 12000);
 		btintel_pcie_reset_ia(data);
+		btintel_pcie_enable_interrupts(data);
 		btintel_pcie_config_msix(data);
 		err = btintel_pcie_enable_bt(data);
 		if (err) {
@@ -2291,6 +2316,12 @@ static void btintel_pcie_remove(struct pci_dev *pdev)
 
 	data = pci_get_drvdata(pdev);
 
+	btintel_pcie_disable_interrupts(data);
+
+	btintel_pcie_synchronize_irqs(data);
+
+	flush_work(&data->rx_work);
+
 	btintel_pcie_reset_bt(data);
 	for (int i = 0; i < data->alloc_vecs; i++) {
 		struct msix_entry *msix_entry;
@@ -2303,8 +2334,6 @@ static void btintel_pcie_remove(struct pci_dev *pdev)
 
 	btintel_pcie_release_hdev(data);
 
-	flush_work(&data->rx_work);
-
 	destroy_workqueue(data->workqueue);
 
 	btintel_pcie_free(data);
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 5fe5879881f5..3ec0be496820 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -2392,10 +2392,17 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 			 */
 			qcadev->bt_power->pwrseq = devm_pwrseq_get(&serdev->dev,
 								   "bluetooth");
-			if (IS_ERR(qcadev->bt_power->pwrseq))
-				return PTR_ERR(qcadev->bt_power->pwrseq);
 
-			break;
+			/*
+			 * Some modules have BT_EN enabled via a hardware pull-up,
+			 * meaning it is not defined in the DTS and is not controlled
+			 * through the power sequence. In such cases, fall through
+			 * to follow the legacy flow.
+			 */
+			if (IS_ERR(qcadev->bt_power->pwrseq))
+				qcadev->bt_power->pwrseq = NULL;
+			else
+				break;
 		}
 		fallthrough;
 	case QCA_WCN3950: