linux-kernel - Re: [PATCH 1/1] tty: atmel_serial_probe(): index of atmel

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Date:	Wed, 20 Feb 2013 16:00:48 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Pawel Wieczorkiewicz <wpawel@...il.com>, nicolas.ferre@...el.com,
	gregkh@...uxfoundation.org, grant.likely@...retlab.ca
CC:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] tty: atmel_serial_probe(): index of atmel_ports[]
 fix

On 02/13/2013 12:17 AM, Pawel Wieczorkiewicz wrote:
> From: Pawel Wieczorkiewicz <wpawel@...il.com>
> 
> Index of atmel_ports[ATMEL_MAX_UART] should be smaller
> than ATMEL_MAX_UART.
> 
> Signed-off-by: Pawel Wieczorkiewicz <wpawel@...il.com>
> ---
>  drivers/tty/serial/atmel_serial.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index d4a7c24..3f7586a 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -1772,7 +1772,7 @@ static int atmel_serial_probe(struct platform_device *pdev)
>  		ret = find_first_zero_bit(&atmel_ports_in_use,
>  				sizeof(atmel_ports_in_use));
>  
> -	if (ret > ATMEL_MAX_UART) {
> +	if (!(ret < ATMEL_MAX_UART)) {

Good catch, but the result looks weird. Could you just make it ">="?

And find_first_zero_bit + sizeof above is bogus too. The sizeof returns
4 on 32-bit (the driver is run on 32bit machines exlusively AFAICS). So
the highest possible ret in there is 5. Instead atmel_ports_in_use
should be declared using DECLARE_BITMAP(atmel_ports_in_use,
ATMEL_MAX_UART) and the second parameter here then ATMEL_MAX_UART.

Could you fix that too?

-- 
js
suse labs
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