linux-kernel - Re: [PATCH v2] tty: xilinx_uartps: Fix missing id assignment to the console

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Message-ID: <170a896f-42d3-345b-7b93-c964d33fe71c@web.de>
Date:   Sat, 30 May 2020 14:06:15 +0200
From:   Jan Kiszka <jan.kiszka@....de>
To:     Michal Simek <michal.simek@...inx.com>,
        linux-kernel@...r.kernel.org, monstr@...str.eu, git@...inx.com,
        stable@...r.kernel.org
Cc:     Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v2] tty: xilinx_uartps: Fix missing id assignment to the
 console

On 04.05.20 16:27, Michal Simek wrote:
> From: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
>
> When serial console has been assigned to ttyPS1 (which is serial1 alias)
> console index is not updated property and pointing to index -1 (statically
> initialized) which ends up in situation where nothing has been printed on
> the port.
>
> The commit 18cc7ac8a28e ("Revert "serial: uartps: Register own uart console
> and driver structures"") didn't contain this line which was removed by
> accident.
>
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@...inx.com>
> Cc: stable <stable@...r.kernel.org>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
>
> Changes in v2:
> - Do better commit description
> - Origin subject was "tty: xilinx_uartps: Add the id to the console"
>
> Greg: Would be good if you can take this patch to 5.7 and also to stable
> trees.
>
> ---
>  drivers/tty/serial/xilinx_uartps.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
> index 672cfa075e28..b9d672af8b65 100644
> --- a/drivers/tty/serial/xilinx_uartps.c
> +++ b/drivers/tty/serial/xilinx_uartps.c
> @@ -1465,6 +1465,7 @@ static int cdns_uart_probe(struct platform_device *pdev)
>  		cdns_uart_uart_driver.nr = CDNS_UART_NR_PORTS;
>  #ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
>  		cdns_uart_uart_driver.cons = &cdns_uart_console;
> +		cdns_uart_console.index = id;
>  #endif
>
>  		rc = uart_register_driver(&cdns_uart_uart_driver);
>

This breaks the ultra96-rev1 which uses uart1 as serial0 (and
stdout-path = "serial0:115200n8"). Reverting this commit gives

[    0.024344] Serial: AMBA PL011 UART driver
[    0.028010] ff000000.serial: ttyPS1 at MMIO 0xff000000 (irq = 19, base_baud = 6250000) is a xuartps
[    0.028172] serial serial0: tty port ttyPS1 registered
[    0.028579] ff010000.serial: ttyPS0 at MMIO 0xff010000 (irq = 20, base_baud = 6250000) is a xuartps
[    0.557477] printk: console [ttyPS0] enabled

again. Affects stable as well (seen first in 5.4).

Jan