| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2018-01-11 17:57:26 (GMT) |
|---|---|---|
| committer | jie.yuan <jie.yuan@amlogic.com> | 2018-04-03 05:58:52 (GMT) |
| commit | d9d62dbcc23e1f5a8772c8cd671d5c8277674c3a (patch) | |
| tree | 0ec2c0a72a4c13f569ccd4915d11a90436554b10 | |
| parent | b42b8b8320047c27656caccc9f9ea2cc0bed88e5 (diff) | |
| download | common-d9d62dbcc23e1f5a8772c8cd671d5c8277674c3a.zip common-d9d62dbcc23e1f5a8772c8cd671d5c8277674c3a.tar.gz common-d9d62dbcc23e1f5a8772c8cd671d5c8277674c3a.tar.bz2 | |
serial: core: mark port as initialized after successful IRQ change
PD#163025: fix pwq null pointer
commit 44117a1d1732c513875d5a163f10d9adbe866c08 upstream.
setserial changes the IRQ via uart_set_info(). It invokes
uart_shutdown() which free the current used IRQ and clear
TTY_PORT_INITIALIZED. It will then update the IRQ number and invoke
uart_startup() before returning to the caller leaving
TTY_PORT_INITIALIZED cleared.
The next open will crash with
| list_add double add: new=ffffffff839fcc98, prev=ffffffff839fcc98, next=ffffffff839fcc98.
since the close from the IOCTL won't free the IRQ (and clean the list)
due to the TTY_PORT_INITIALIZED check in uart_shutdown().
There is same pattern in uart_do_autoconfig() and I *think* it also
needs to set TTY_PORT_INITIALIZED there.
Is there a reason why uart_startup() does not set the flag by itself
after the IRQ has been acquired (since it is cleared in uart_shutdown)?
Change-Id: I8c86b0aeb36986195276d94abd68917a08758a3e
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 70ad5fe..839cee4 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -968,6 +968,8 @@ static int uart_set_info(struct tty_struct *tty, struct tty_port *port, } } else { retval = uart_startup(tty, state, 1); + if (retval == 0) + tty_port_set_initialized(port, true); if (retval > 0) retval = 0; } |