Re: [PATCH 2/9] serial: core: use uart_iotype_*() to simplify code

[Hugo Villeneuve]

On Fri, 24 Apr 2026 14:13:02 +0300 (EEST)
Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx> wrote:

> On Thu, 23 Apr 2026, Hugo Villeneuve wrote:
> 
> > From: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
> > 
> > Make use of new functions uart_iotype_mmio() and uart_iotype_legacy_io()
> > to simplify and improve code readability.
> > 
> > Signed-off-by: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
> > ---
> >  drivers/tty/serial/serial_core.c | 24 +++++++++---------------
> >  1 file changed, 9 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> > index b1cf45a8fc854cd97e349ff077d83b42e3ef8b16..fc273f8f9e75de89dca1ac1aca3589567bcf8a18 100644
> > --- a/drivers/tty/serial/serial_core.c
> > +++ b/drivers/tty/serial/serial_core.c
> > @@ -3221,23 +3221,17 @@ bool uart_match_port(const struct uart_port *port1,
> >  {
> >  	if (port1->iotype != port2->iotype)
> >  		return false;
> > -
> > -	switch (port1->iotype) {
> > -	case UPIO_PORT:
> > -		return port1->iobase == port2->iobase;
> > -	case UPIO_HUB6:
> > -		return port1->iobase == port2->iobase &&
> > -		       port1->hub6   == port2->hub6;
> > -	case UPIO_MEM:
> > -	case UPIO_MEM16:
> > -	case UPIO_MEM32:
> > -	case UPIO_MEM32BE:
> > -	case UPIO_AU:
> > -	case UPIO_TSI:
> > +	else if (uart_iotype_mmio(port1->iotype))
> >  		return port1->mapbase == port2->mapbase;
> > -	default:
> > +	else if (uart_iotype_legacy_io(port1->iotype))
> > +		if (port1->iobase != port2->iobase)
> > +			return false;
> > +		else if (port1->iotype == UPIO_HUB6 && port1->hub6 != port2->hub6)
> 
> I suggest placing the entire hub6 related check (including the iobase 
> check) into own function in 8250_hub6.c and add a stub for the case when 
> hub6 code is not even built into kernel into 8250.h.

Neat. I will make a separate commit for that in V2. This
simplifies uart_match_port() even more...

Thank you,
Hugo.


> 
> > +			return false;
> > +		else
> > +			return true;
> > +	else
> >  		return false;
> > -	}
> >  }
> >  EXPORT_SYMBOL(uart_match_port);
> >  
> > 
> > 
> 
> -- 
>  i.
> 
> 


-- 
Hugo Villeneuve