Regression: serial: imx: overrun errors on debug UART

[Stefan Wahren]

Hi Greg,

Am 20.06.23 um 16:59 schrieb Greg Kroah-Hartman:
> On Tue, Jun 20, 2023 at 04:47:10PM +0200, Linux regression tracking (Thorsten Leemhuis) wrote:
>> On 24.05.23 15:07, Stefan Wahren wrote:
>>>
>>> Am 23.05.23 um 21:44 schrieb Sergey Organov:
>>>> "Linux regression tracking (Thorsten Leemhuis)"
>>>> <regressions at leemhuis.info> writes:
>>>>
>>>> Solving this would need to identify the cause of interrupts being
>>>> disabled for prolonged times, and nobody volunteered to investigate this
>>>> further. One suspect, the Linux serial console, has been likely excluded
>>>> already though, as not actually being in use for printk() output.
>>>>
>>>
>>> I don't think that we can exclude the serial console as a whole, i never
>>> made such a observation. But at least we can exclude kernel logging on
>>> the debug UART.
>>
>> Stefan, just wondering: was this ever addressed upstream? I assume it's
>> not, just wanted to be sure.
>>
>> I'm a bit unsure what to do with this and consider asking Greg for
>> advice, as he applied the patch. On one hand it's *IMHO* clearly a
>> regression (but for the record,  some people involved in the discussion
>> claim it's not). OTOH the culprit was applied more than a year ago now,
>> so reverting it might cause more trouble than it's worth at this point,
>> as that could lead to regressions for other users.
> 
> I'll be glad to revert this, but for some reason I thought that someone
> was working on a "real fix" here.  Stefan, is that not the case?

i can only repeat the statements from 23.5.:

Unfortunately my time budget to investigate this issue further is 
exhausted, so i stopped working at this.

In case someone can give clear instructions to investigate this further, 
i will try to look at it in my spare time. But i cannot make any promises.

I'm not aware that some else is working on this.

Best regards

> 
> thanks,
> 
> greg k-h