linux-kernel - Re: [PATCH 1/2] tty: serial_core: convert uart_open to use tty_port

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Date:   Wed, 24 Aug 2016 14:46:44 +0100
From:   One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:     Rob Herring <robh@...nel.org>
Cc:     Alan Cox <alan@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Peter Hurley <peter@...leysoftware.com>
Subject: Re: [PATCH 1/2] tty: serial_core: convert uart_open to use
 tty_port_open

On Mon, 22 Aug 2016 17:39:09 -0500
Rob Herring <robh@...nel.org> wrote:

> tty_port_open handles much of the common parts of tty opening. Convert
> uart_open to use it and move the serial_core specific parts into
> tty_port.activate function. This will be needed to use tty_port functions
> directly from in kernel clients.
> 
> The tricky part is uart_port_startup can return positive values to allow
> setserial to configure the port. We now return the positive value to
> tty_port_open so that the tty is not marked as initialized and then set the
> return value in uart_open to 0.
> 
> Cc: Alan Cox <alan@...ux.intel.com>
> Cc: Peter Hurley <peter@...leysoftware.com>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
> In looking at using tty_port for uart slaves, this is the first thing I 
> hit. serial_core doesn't even use the 2 functions that already exist for 
> tty_port and are needed.
> 
> I've tested this on QEMU with pl011 and 8250 UARTs using setserial, but 
> I'm not sure what are all the tricky cases to handle.
> 
> Greg, Don't apply these without comment from Alan and Peter.

Originally I didn't convert them because the lockign was incompatible.
That looks to have been fixed by other changes. This is definitely the
right direction irrespective of the uart slave discussion.

Acked-by: Alan Cox <alan@...ux.intel.com>