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

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Date:   Mon, 1 Jun 2020 12:23:20 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     Jan Kiszka <jan.kiszka@....de>,
        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 30. 05. 20 14:06, Jan Kiszka wrote:
> 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).

Will take a look at this. Just give me some time.

M