Re: [PATCH printk v5 1/1] printk: extend console_lock for per-console locking

[Neil Armstrong <narmstrong@baylibre.com>]

Hi,

On 06/05/2022 08:43, Marek Szyprowski wrote:
> Hi John,
> 
> On 06.05.2022 00:33, John Ogness wrote:
>> On 2022-05-05, John Ogness <john.ogness@linutronix.de> wrote:
>>> I will go through and check if all access to AML_UART_CONTROL is
>>> protected by port->lock.
>> The startup() callback of the uart_ops is not called with the port
>> locked. I'm having difficulties identifying if the startup() callback
>> can occur after the console was already registered via meson_uart_init()
>> and could be actively printing, but I see other serial drivers are
>> protecting their registers in the startup() callback with the
>> port->lock.
>>
>> Could you try booting the meson hardware with the following change? (And
>> removing any previous debug changes I posted?)
> 
> Bingo! It looks that the startup() is called when getty initializes
> console. This fixed the issues observed on the Amlogic Meson based boards.
> 
> Feel free to add:
> 
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> 
> Best regards

Thanks all for figuring out the issue, perhaps other uart drivers could fall
in the same issue if startup code isn't protected with lock ?

Neil

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