linux-kernel - Re: [PATCH] tilegx: Add tty serial support for TILE-Gx on-chip UART

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Date:	Mon, 12 Aug 2013 13:23:56 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH] tilegx: Add tty serial support for TILE-Gx on-chip UART

On Mon, Aug 12, 2013 at 02:56:37PM -0400, Chris Metcalf wrote:
> On 8/12/2013 2:43 PM, Greg Kroah-Hartman wrote:
> > On Mon, Aug 12, 2013 at 02:11:44PM -0400, Chris Metcalf wrote:
> >> +/*
> >> + * Enable modem status interrupts.
> >> + */
> >> +static void tilegx_enable_ms(struct uart_port *port)
> >> +{
> >> +	/* N/A */
> >> +}
> >> +
> >> +/*
> >> + * Control the transmission of a break signal.
> >> + */
> >> +static void tilegx_break_ctl(struct uart_port *port, int break_state)
> >> +{
> >> +	/* N/A */
> >> +}
> > For most of these "empty" callbacks, you shouldn't have to declare them
> > at all, and all should work just fine.
> 
> I may be missing something, but it looks like drivers/tty/serial/serial_core.c
> calls all of the "empty" callbacks unconditionally, so some definition
> is required.

Ah, you are right, I was looking at the "raw" tty driver, not the uart
driver, my mistake.

greg k-h
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