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Date:   Thu, 17 Mar 2022 10:29:40 +0200 (EET)
From:   =?ISO-8859-15?Q?Ilpo_J=E4rvinen?= <ilpo.jarvinen@linux.intel.com>
To:     Wander Lairson Costa <wander@redhat.com>
cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jirislaby@kernel.org>,
        Johan Hovold <johan@kernel.org>,
        "Maciej W. Rozycki" <macro@orcam.me.uk>,
        Serge Semin <fancer.lancer@gmail.com>,
        Lukas Wunner <lukas@wunner.de>,
        =?ISO-8859-15?Q?Pali_Roh=E1r?= <pali@kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>, rostedt@goodmis.org,
        senozhatsky@chromium.org, andre.goddard@gmail.com,
        sudipm.mukherjee@gmail.com, andy.shevchenko@gmail.com,
        David.Laight@aculab.com, jonathanh@nvidia.com, phil@raspberrypi.com
Subject: Re: [PATCH v4 2/5] serial/8250: Use the cache value of the FCR
 register
In-Reply-To: <20220316143646.13301-3-wander@redhat.com>
Message-ID: <ce8be768-6210-c3b-2131-de302a7757d@linux.intel.com>
References: <20220316143646.13301-1-wander@redhat.com> <20220316143646.13301-3-wander@redhat.com>
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On Wed, 16 Mar 2022, Wander Lairson Costa wrote:

> commit 5021d709b31b ("tty: serial: Use fifo in 8250 console driver")
> erroneous tries to read the FCR register content, but this register is
> write-only.
> 
> This patch fixes that by reading the content from the port struct fcr
> field.
> 
> Thanks to Jon Hunter and Jiri Slaby.
> 
> Suggested-by: Jiri Slaby <jirislaby@kernel.org>
> Reported-by: Jon Hunter <jonathanh@nvidia.com>
> Signed-off-by: Wander Lairson Costa <wander@redhat.com>
> ---
>  drivers/tty/serial/8250/8250_port.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
> index 2abb3de11a48..9f3fa9fe2a4e 100644
> --- a/drivers/tty/serial/8250/8250_port.c
> +++ b/drivers/tty/serial/8250/8250_port.c
> @@ -3410,7 +3410,7 @@ void serial8250_console_write(struct uart_8250_port *up, const char *s,
>  
>  	use_fifo = (up->capabilities & UART_CAP_FIFO) &&
>  		port->fifosize > 1 &&
> -		(serial_port_in(port, UART_FCR) & UART_FCR_ENABLE_FIFO) &&
> +		(up->fcr & UART_FCR_ENABLE_FIFO) &&

Didn't you just add this line in 1/5? Please merge this kind of fixes that 
are due to development history of a change to the main patch itself.


-- 
 i.