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Bluetooth: hci_uart: Cancel init work before unregistering 

[ Upstream commit 3b799254cf ]

If hci_uart_tty_close() or hci_uart_unregister_device() is called while
hu->init_ready is scheduled, hci_register_dev() could be called after
the hci_uart is torn down. Avoid this by ensuring the work is complete
or canceled before checking the HCI_UART_REGISTERED flag.

Fixes: 9f2aee848f ("Bluetooth: Add delayed init sequence support for UART controllers")
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Samuel Holland 2020-08-01 11:29:56 -05:00 committed by Greg Kroah-Hartman
parent e99958ec09
commit 0d234d1135
2 changed files with 3 additions and 0 deletions
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1
drivers/bluetooth/hci_ldisc.c
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@ -538,6 +538,7 @@ static void hci_uart_tty_close(struct tty_struct *tty)
clear_bit(HCI_UART_PROTO_READY, &hu->flags);
percpu_up_write(&hu->proto_lock);
cancel_work_sync(&hu->init_ready);
cancel_work_sync(&hu->write_work);
if (hdev) {

2
drivers/bluetooth/hci_serdev.c
View File

@ -357,6 +357,8 @@ void hci_uart_unregister_device(struct hci_uart *hu)
struct hci_dev *hdev = hu->hdev;
clear_bit(HCI_UART_PROTO_READY, &hu->flags);
cancel_work_sync(&hu->init_ready);
if (test_bit(HCI_UART_REGISTERED, &hu->flags))
hci_unregister_dev(hdev);
hci_free_dev(hdev);