This is a note to let you know that I've just added the patch titled serial: tty: uartlite: fix console setup to the 5.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: serial-tty-uartlite-fix-console-setup.patch and it can be found in the queue-5.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit c7544f4aeb12fdb20017947746cdc5a47ec7a4fd Author: Daniel Mack <daniel@xxxxxxxxxx> Date: Fri May 28 15:33:20 2021 +0200 serial: tty: uartlite: fix console setup [ Upstream commit d157fca711ad42e75efef3444c83d2e1a17be27a ] Remove the hack to assign the global console_port variable at probe time. This assumption that cons->index is -1 is wrong for systems that specify 'console=' in the cmdline (or 'stdout-path' in dts). Hence, on such system the actual console assignment is ignored, and the first UART that happens to be probed is used as console instead. Move the logic to console_setup() and map the console to the correct port through the array of available ports instead. Signed-off-by: Daniel Mack <daniel@xxxxxxxxxx> Link: https://lore.kernel.org/r/20210528133321.1859346-1-daniel@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c index f42ccc40ffa6..a5f15f22d9ef 100644 --- a/drivers/tty/serial/uartlite.c +++ b/drivers/tty/serial/uartlite.c @@ -505,21 +505,23 @@ static void ulite_console_write(struct console *co, const char *s, static int ulite_console_setup(struct console *co, char *options) { - struct uart_port *port; + struct uart_port *port = NULL; int baud = 9600; int bits = 8; int parity = 'n'; int flow = 'n'; - - port = console_port; + if (co->index >= 0 && co->index < ULITE_NR_UARTS) + port = ulite_ports + co->index; /* Has the device been initialized yet? */ - if (!port->mapbase) { + if (!port || !port->mapbase) { pr_debug("console on ttyUL%i not present\n", co->index); return -ENODEV; } + console_port = port; + /* not initialized yet? */ if (!port->membase) { if (ulite_request_port(port)) @@ -655,17 +657,6 @@ static int ulite_assign(struct device *dev, int id, u32 base, int irq, dev_set_drvdata(dev, port); -#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE - /* - * If console hasn't been found yet try to assign this port - * because it is required to be assigned for console setup function. - * If register_console() don't assign value, then console_port pointer - * is cleanup. - */ - if (ulite_uart_driver.cons->index == -1) - console_port = port; -#endif - /* Register the port */ rc = uart_add_one_port(&ulite_uart_driver, port); if (rc) { @@ -675,12 +666,6 @@ static int ulite_assign(struct device *dev, int id, u32 base, int irq, return rc; } -#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE - /* This is not port which is used for console that's why clean it up */ - if (ulite_uart_driver.cons->index == -1) - console_port = NULL; -#endif - return 0; }