linux-kernel - Re: [PATCH v2 2/3] serial: 8250: Store whether fifo device is enabled

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Date: Tue, 16 Apr 2024 19:09:52 +0000
From: Michael Pratt <mcpratt@...me>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jirislaby@...nel.org>, Wander Lairson Costa <wander@...hat.com>, Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, Vamshi Gajjela <vamshigajjela@...gle.com>
Subject: Re: [PATCH v2 2/3] serial: 8250: Store whether fifo device is enabled

Hi Andy,

On Tuesday, April 16th, 2024 at 14:55, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> 
> > @@ -3392,6 +3392,8 @@ void serial8250_console_write(struct uart_8250_port *up, const char *s,
> 
> > + up->fifo_enable = use_fifo;
> 
> 
> This seems incorrect / not the only one place to assign this. What if the
> console not enabled at compile time? What if it's not enabled at boot time?
>

This is 8250 specific, and currently, it's the only place there
where it's decided whether or not to use the fifo device
by checking a bunch of flags and values.

If you're suggesting that these checks are moved out of this function somewhere else,
I would probably agree with that, but let's save that idea for the future...

If you're suggesting that there could be a null pointer, I don't think that's possible
in this function... (the name of the pointer being "up" might be confusing?)

Sorry if I'm misunderstanding what you mean.

> --
> With Best Regards,
> Andy Shevchenko

--
MCP