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| author | Ronald Tschalär <ronald@innovation.ch> | 2017-10-25 22:15:19 -0700 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2017-10-30 15:48:32 +0100 |
| commit | 0338b1b393ec7910898e8f7b25b3bf31a7282e16 (patch) | |
| tree | a72e920fd7572388e6a16aec289de034f9c001bb /drivers/bluetooth | |
| parent | 459232fc0e2505d489e2dc3befc1ad01dcdccb47 (diff) | |
| download | linux-0338b1b393ec7910898e8f7b25b3bf31a7282e16.tar.gz linux-0338b1b393ec7910898e8f7b25b3bf31a7282e16.tar.bz2 linux-0338b1b393ec7910898e8f7b25b3bf31a7282e16.zip | |
Bluetooth: hci_ldisc: Fix another race when closing the tty.
The following race condition still existed:
P1 P2
cancel_work_sync()
hci_uart_tx_wakeup()
hci_uart_write_work()
hci_uart_dequeue()
clear_bit(HCI_UART_PROTO_READY)
hci_unregister_dev(hdev)
hci_free_dev(hdev)
hu->proto->close(hu)
kfree(hu)
access to hdev and hu
Cancelling the work after clearing the HCI_UART_PROTO_READY bit avoids
this as any hci_uart_tx_wakeup() issued after the flag is cleared will
detect that and not schedule further work.
Signed-off-by: Ronald Tschalär <ronald@innovation.ch>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'drivers/bluetooth')
| -rw-r--r-- | drivers/bluetooth/hci_ldisc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c index 31def781a562..c823914b3a80 100644 --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -523,13 +523,13 @@ static void hci_uart_tty_close(struct tty_struct *tty) if (hdev) hci_uart_close(hdev); - cancel_work_sync(&hu->write_work); - if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { percpu_down_write(&hu->proto_lock); clear_bit(HCI_UART_PROTO_READY, &hu->flags); percpu_up_write(&hu->proto_lock); + cancel_work_sync(&hu->write_work); + if (hdev) { if (test_bit(HCI_UART_REGISTERED, &hu->flags)) hci_unregister_dev(hdev); |