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- From a98fb5280c69d90e85bb875177a68880089312b0 Mon Sep 17 00:00:00 2001
- From: Phil Elwell <phil@raspberrypi.org>
- Date: Wed, 9 Mar 2016 13:28:24 +0000
- Subject: [PATCH] serial: Take care starting a hung-up tty's port
- tty_port_hangup sets a port's tty field to NULL (holding the port lock),
- but uart_tx_stopped, called from __uart_start (with the port lock),
- uses the tty field without checking for NULL.
- Change uart_tx_stopped to treat a NULL tty field as another stopped
- indication.
- Signed-off-by: Phil Elwell <phil@raspberrypi.org>
- ---
- include/linux/serial_core.h | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
- --- a/include/linux/serial_core.h
- +++ b/include/linux/serial_core.h
- @@ -397,7 +397,7 @@ int uart_resume_port(struct uart_driver
- static inline int uart_tx_stopped(struct uart_port *port)
- {
- struct tty_struct *tty = port->state->port.tty;
- - if (tty->stopped || port->hw_stopped)
- + if (!tty || tty->stopped || port->hw_stopped)
- return 1;
- return 0;
- }
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