Re: [PATCH v3 2/6] serial: core: Allow detach and attach serial device for console

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* Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> [200702 20:04]:
> Hi Tony,
> 
> On Thu, Jul 2, 2020 at 9:35 PM Tony Lindgren <tony@xxxxxxxxxxx> wrote:
> > * Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> [200702 14:50]:
> > > On Sun, May 24, 2020 at 7:11 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > > > any special reason for this change ? It is not really explained in the
> > > > commit description.
> > >
> > > Indeed. Why this change?
> >
> > For a kernel console, we want it to work for important oopses
> > etc without trying to enable DMA or power on regulators for example.
> 
> [...]
> 
> Thanks for the explanation about irqsafe consoles!
> I think I cannot disagree with that ;-)

You're welcome..

> Sorry for being a bit unclear, but my question (and I guess Günter's
> question, too) was about this particular change:
> 
>      static inline void uart_port_spin_lock_init(struct uart_port *port)
>      {
>     -     if (uart_console_enabled(port))
>     +     if (uart_console(port))
> 
> This change seems to be completely unrelated, is not explained in the
> commit description, and is the cause of the regression we're seeing.

..sorry looks I missed the context a bit then :) Hmm yeah not sure about
this change above.

Regards,

Tony



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