[PATCH 07/13] Bluetooth: hci_uart: Restore hci_dev->flush callback on open()
From: Hans de Goede <hidden>
Date: 2018-05-27 19:04:51
Also in:
linux-bluetooth
Subsystem:
bluetooth drivers, the rest · Maintainers:
Marcel Holtmann, Luiz Augusto von Dentz, Linus Torvalds
For reasons explained in detail in commit 3611f4d2a5e0 ("hci_ldisc:
fix null pointer deref") the hci_uart_close() functions sets
hci_dev->flush to NULL.
But the device may be re-opened after a close, this commit restores the
hci_dev->flush callback on open().
Note this commit also moves the nearly empty defition of hci_uart_open()
a bit down in the file to avoid the need for forward declaring
hci_uart_flush().
Signed-off-by: Hans de Goede <redacted>
---
drivers/bluetooth/hci_ldisc.c | 20 +++++++++++---------
drivers/bluetooth/hci_serdev.c | 19 +++++++++++--------
2 files changed, 22 insertions(+), 17 deletions(-)
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index b6a71705b7d6..8da0f53b5912 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c@@ -229,15 +229,6 @@ int hci_uart_init_ready(struct hci_uart *hu) } /* ------- Interface to HCI layer ------ */ -/* Initialize device */ -static int hci_uart_open(struct hci_dev *hdev) -{ - BT_DBG("%s %p", hdev->name, hdev); - - /* Nothing to do for UART driver */ - return 0; -} - /* Reset device */ static int hci_uart_flush(struct hci_dev *hdev) {
@@ -264,6 +255,17 @@ static int hci_uart_flush(struct hci_dev *hdev) return 0; } +/* Initialize device */ +static int hci_uart_open(struct hci_dev *hdev) +{ + BT_DBG("%s %p", hdev->name, hdev); + + /* Undo clearing this from hci_uart_close() */ + hdev->flush = hci_uart_flush; + + return 0; +} + /* Close device */ static int hci_uart_close(struct hci_dev *hdev) {
diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c
index e0e6461b9200..da6eb5bcfa6f 100644
--- a/drivers/bluetooth/hci_serdev.c
+++ b/drivers/bluetooth/hci_serdev.c@@ -101,14 +101,6 @@ static void hci_uart_write_work(struct work_struct *work) /* ------- Interface to HCI layer ------ */ -/* Initialize device */ -static int hci_uart_open(struct hci_dev *hdev) -{ - BT_DBG("%s %p", hdev->name, hdev); - - return 0; -} - /* Reset device */ static int hci_uart_flush(struct hci_dev *hdev) {
@@ -129,6 +121,17 @@ static int hci_uart_flush(struct hci_dev *hdev) return 0; } +/* Initialize device */ +static int hci_uart_open(struct hci_dev *hdev) +{ + BT_DBG("%s %p", hdev->name, hdev); + + /* Undo clearing this from hci_uart_close() */ + hdev->flush = hci_uart_flush; + + return 0; +} + /* Close device */ static int hci_uart_close(struct hci_dev *hdev) {
--
2.17.0