diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0203-serial-Take-care-starting-a-hung-up-tty-s-port.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0203-serial-Take-care-starting-a-hung-up-tty-s-port.patch | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0203-serial-Take-care-starting-a-hung-up-tty-s-port.patch b/target/linux/brcm2708/patches-4.4/0203-serial-Take-care-starting-a-hung-up-tty-s-port.patch new file mode 100644 index 0000000000..5ab6d2e509 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0203-serial-Take-care-starting-a-hung-up-tty-s-port.patch @@ -0,0 +1,28 @@ +From c9276ae7cfecbd1df477ff31116682e72dd6d8f7 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Wed, 9 Mar 2016 13:28:24 +0000 +Subject: [PATCH 203/232] 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; + } |