linux-kernel - Re: [PATCH 1/5] serial: 8250: extract serial8250_init

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Message-ID: <aFmYwcO9tJ4byxjz@surfacebook.localdomain>
Date: Mon, 23 Jun 2025 21:11:13 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Cc: gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH 1/5] serial: 8250: extract serial8250_init_mctrl()

Mon, Jun 23, 2025 at 09:46:02AM +0200, Jiri Slaby (SUSE) kirjoitti:
> After commit 795158691cc0 ("serial: 8250: extract
> serial8250_initialize()"), split serial8250_initialize() even more --
> the mctrl part of this code can be separated into
> serial8250_init_mctrl() -- done now.

...

> +static void serial8250_init_mctrl(struct uart_port *port)
> +{
> +	struct uart_8250_port *up = up_to_u8250p(port);
> +
> +	if (up->port.flags & UPF_FOURPORT) {
> +		if (!up->port.irq)
> +			up->port.mctrl |= TIOCM_OUT1;

I am not sure I understand why it was changed from using port directly to
up->port.

> +	} else
> +		/*
> +		 * Most PC uarts need OUT2 raised to enable interrupts.
> +		 */
> +		if (port->irq)
> +			up->port.mctrl |= TIOCM_OUT2;

Having {} in this branch is also better.

> +	serial8250_set_mctrl(port, port->mctrl);
> +}

...

I specifically left below to point out the original code.

> -	if (port->flags & UPF_FOURPORT) {
> -		if (!port->irq)
> -			port->mctrl |= TIOCM_OUT1;
> -	} else {
> -		/* Most PC uarts need OUT2 raised to enable interrupts. */
> -		if (port->irq)
> -			port->mctrl |= TIOCM_OUT2;
> -	}

-- 
With Best Regards,
Andy Shevchenko