[PATCH v4 0/4] serial: fix ioctl hangup race

[Johan Hovold]

The tty ioctls can race with hangup and end up calling into a tty
driver for a device that is already gone or powered down.

Included since v3 are also two related fixes for issues highlighted by
Sashiko.

Johan


Changes in v4
 - include TIOCSETD which also access hardware

Changes in v3
 - revert guards in uart_wait_modem_status()
 - fix race in TIOCMIWAIT (new)
 - abort TIOCMIWAIT on hangup (new)

Changes in v2
 - include TIOCMIWAIT which also access hardware
 - replace broken scoped_guard() construct in wait loop


Johan Hovold (4):
  serial: revert guards in uart_wait_modem_status()
  serial: fix ioctl hangup race
  serial: fix TIOCMIWAIT race
  serial: abort TIOCMIWAIT on hangup

 drivers/tty/serial/serial_core.c | 59 ++++++++++++++++++++++----------
 1 file changed, 41 insertions(+), 18 deletions(-)

-- 
2.55.0