linux-kernel - Re: [PATCH] tty: serial: pl011: add ttyAMA for matching pl011 console

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Message-ID: <8a7074e1-b106-1847-f045-6400d6832110@gmail.com>
Date:   Wed, 1 Mar 2017 14:51:53 +0300
From:   Aleksey Makarov <amakarov.linux@...il.com>
To:     Sudeep Holla <sudeep.holla@....com>, linux-serial@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Peter Hurley <peter@...leysoftware.com>,
        Aleksey Makarov <aleksey.makarov@...aro.org>
Subject: Re: [PATCH] tty: serial: pl011: add ttyAMA for matching pl011 console



On 02/01/2017 06:46 PM, Sudeep Holla wrote:
> Commit c7cef0a84912 ("console: Add extensible console matching") added
> match() method to struct console which allows the console to perform
> console command line matching instead of (or in addition to) default
> console matching (ie., by fixed name and index).
> 
> Commit ad1696f6f09d ("ACPI: parse SPCR and enable matching console")
> introduced support for SPCR as matching console.
> 
> Commit 10879ae5f12e ("serial: pl011: add console matching function")
> added the match method for pl011 console which checks for the console
> string to be "pl011"
> 
> Now on a platform which has both SPCR in the ACPI tables and ttyAMA in
> the command line, the ttyAMA is chosen as "selected console" but it
> doesn't pass the matching console method which results in CON_CONSDEV
> not being set on the "selected console".
> 
> As a result of that, the bootconsole(SPCR in the above case) is not
> unregistered and all the beginning boot messages are seen twice.
> 
> This patch adds "ttyAMA" so that it's considered to match pl011 console.
> 
> Fixes: 10879ae5f12e ("serial: pl011: add console matching function")
> Cc: Russell King <linux@...linux.org.uk>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Jiri Slaby <jslaby@...e.com>
> Cc: Peter Hurley <peter@...leysoftware.com>
> Cc: Aleksey Makarov <aleksey.makarov@...aro.org>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>  drivers/tty/serial/amba-pl011.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index 963c2e5feedd..533b18d4a587 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -2340,7 +2340,7 @@ static int __init pl011_console_match(struct console *co, char *name, int idx,
>  	resource_size_t addr;
>  	int i;
> 
> -	if (strcmp(name, "pl011") != 0)
> +	if (strcmp(name, "pl011") != 0 || strcmp(name, "ttyAMA") != 0)

So the condition is always true now?

The patch is obviously wrong and should be reverted ASAP.

Thank you
Aleksey Makarov

>  		return -ENODEV;
> 
>  	if (uart_parse_earlycon(options, &iotype, &addr, &options))
> --
> 2.7.4
> 
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