linux-kernel - [PATCH 1/2] Bluetooth: hci_h5: Add ability to allocate memory for private data

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Date: Sat, 24 Feb 2024 00:37:03 +0300
From: Andrey Skvortsov <andrej.skvortzov@...il.com>
To: Marcel Holtmann <marcel@...tmann.org>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>,
	Hilda Wu <hildawu@...ltek.com>,
	Alex Lu <alex_lu@...lsil.com.cn>,
	linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Arnaud Ferraris <arnaud.ferraris@...labora.com>,
	Andrey Skvortsov <andrej.skvortzov@...il.com>
Subject: [PATCH 1/2] Bluetooth: hci_h5: Add ability to allocate memory for private data

In some cases uart-base drivers may need to use priv data. For
example, to store information needed for devcoredump.

Fixes: 044014ce85a1 ("Bluetooth: btrtl: Add Realtek devcoredump support")
Signed-off-by: Andrey Skvortsov <andrej.skvortzov@...il.com>
---
 drivers/bluetooth/hci_h5.c     |  4 +++-
 drivers/bluetooth/hci_serdev.c |  9 +++++----
 drivers/bluetooth/hci_uart.h   | 12 +++++++++++-
 3 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 71e748a9477e..b66136348bd6 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -113,6 +113,7 @@ struct h5_vnd {
 	int (*suspend)(struct h5 *h5);
 	int (*resume)(struct h5 *h5);
 	const struct acpi_gpio_mapping *acpi_gpio_map;
+	int sizeof_priv;
 };
 
 struct h5_device_data {
@@ -863,7 +864,8 @@ static int h5_serdev_probe(struct serdev_device *serdev)
 	if (IS_ERR(h5->device_wake_gpio))
 		return PTR_ERR(h5->device_wake_gpio);
 
-	return hci_uart_register_device(&h5->serdev_hu, &h5p);
+	return hci_uart_register_device_priv(&h5->serdev_hu, &h5p,
+					     h5->vnd->sizeof_priv);
 }
 
 static void h5_serdev_remove(struct serdev_device *serdev)
diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c
index 39c8b567da3c..214fff876eae 100644
--- a/drivers/bluetooth/hci_serdev.c
+++ b/drivers/bluetooth/hci_serdev.c
@@ -300,8 +300,9 @@ static const struct serdev_device_ops hci_serdev_client_ops = {
 	.write_wakeup = hci_uart_write_wakeup,
 };
 
-int hci_uart_register_device(struct hci_uart *hu,
-			     const struct hci_uart_proto *p)
+int hci_uart_register_device_priv(struct hci_uart *hu,
+			     const struct hci_uart_proto *p,
+			     int sizeof_priv)
 {
 	int err;
 	struct hci_dev *hdev;
@@ -325,7 +326,7 @@ int hci_uart_register_device(struct hci_uart *hu,
 	set_bit(HCI_UART_PROTO_READY, &hu->flags);
 
 	/* Initialize and register HCI device */
-	hdev = hci_alloc_dev();
+	hdev = hci_alloc_dev_priv(sizeof_priv);
 	if (!hdev) {
 		BT_ERR("Can't allocate HCI device");
 		err = -ENOMEM;
@@ -394,7 +395,7 @@ int hci_uart_register_device(struct hci_uart *hu,
 	percpu_free_rwsem(&hu->proto_lock);
 	return err;
 }
-EXPORT_SYMBOL_GPL(hci_uart_register_device);
+EXPORT_SYMBOL_GPL(hci_uart_register_device_priv);
 
 void hci_uart_unregister_device(struct hci_uart *hu)
 {
diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
index fb4a2d0d8cc8..68c8c7e95d64 100644
--- a/drivers/bluetooth/hci_uart.h
+++ b/drivers/bluetooth/hci_uart.h
@@ -97,7 +97,17 @@ struct hci_uart {
 
 int hci_uart_register_proto(const struct hci_uart_proto *p);
 int hci_uart_unregister_proto(const struct hci_uart_proto *p);
-int hci_uart_register_device(struct hci_uart *hu, const struct hci_uart_proto *p);
+
+int hci_uart_register_device_priv(struct hci_uart *hu,
+				  const struct hci_uart_proto *p,
+				  int sizeof_priv);
+
+static inline int hci_uart_register_device(struct hci_uart *hu,
+					   const struct hci_uart_proto *p)
+{
+	return hci_uart_register_device_priv(hu, p, 0);
+}
+
 void hci_uart_unregister_device(struct hci_uart *hu);
 
 int hci_uart_tx_wakeup(struct hci_uart *hu);
-- 
2.43.0