From: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
The port->console flag is always false, as uart_console() is called
before the serial console has been registered.
Hence for a serial port used as the console, uart_tty_port_shutdown()
will still be called when userspace closes the port, powering it down.
This may lead to a system lock up when the serial console driver writes
to the serial port's registers.
To fix this, move the setting of port->console after the call to
uart_configure_port(), which registers the serial console.
Fixes: 761ed4a94582ab29 ("tty: serial_core: convert uart_close to use tty_port_close")
Reported-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
Tested-by: Mugunthan V N <mugunthanvnm@xxxxxx>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
[robh: rebased on tty-linus]
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
---
drivers/tty/serial/serial_core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 664c99aeeca5..ce8899c13af3 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2759,6 +2759,8 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
uart_configure_port(drv, state, uport);
+ port->console = uart_console(uport);
+
num_groups = 2;
if (uport->attr_group)
num_groups++;
--
2.10.1
--
To unsubscribe from this list: send the line "unsubscribe linux-serial" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
