netdev - Re: [PATCH] can: sja1000_isa: fix "limited range" compiler warnings

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Message-ID: <4ECE0FB6.5000106@pengutronix.de>
Date:	Thu, 24 Nov 2011 10:34:46 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Wolfgang Grandegger <wg@...ndegger.com>
CC:	Netdev@...r.kernel.org,
	"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
Subject: Re: [PATCH] can: sja1000_isa: fix "limited range" compiler warnings

On 11/24/2011 10:08 AM, Wolfgang Grandegger wrote:
> This patch fixes the compiler warnings: "comparison is always
> false due to limited range of data type" by using "0xff" instead
> of "-1" for unsigned values.
> 
> Signed-off-by: Wolfgang Grandegger <wg@...ndegger.com>

Acked-by: Marc Kleine-Budde <mkl@...gutronix.de>
> ---
>  drivers/net/can/sja1000/sja1000_isa.c |   24 ++++++++++++------------
>  1 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/net/can/sja1000/sja1000_isa.c b/drivers/net/can/sja1000/sja1000_isa.c
> index 496223e..f0840d5 100644
> --- a/drivers/net/can/sja1000/sja1000_isa.c
> +++ b/drivers/net/can/sja1000/sja1000_isa.c
> @@ -44,9 +44,9 @@ static unsigned long port[MAXDEV];
>  static unsigned long mem[MAXDEV];
>  static int __devinitdata irq[MAXDEV];
>  static int __devinitdata clk[MAXDEV];
> -static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
> -static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
> -static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
> +static unsigned char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
> +static unsigned char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
> +static int __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
>  
>  module_param_array(port, ulong, NULL, S_IRUGO);
>  MODULE_PARM_DESC(port, "I/O port number");
> @@ -54,7 +54,7 @@ MODULE_PARM_DESC(port, "I/O port number");
>  module_param_array(mem, ulong, NULL, S_IRUGO);
>  MODULE_PARM_DESC(mem, "I/O memory address");
>  
> -module_param_array(indirect, byte, NULL, S_IRUGO);
> +module_param_array(indirect, int, NULL, S_IRUGO);
>  MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
>  
>  module_param_array(irq, int, NULL, S_IRUGO);
> @@ -189,17 +189,17 @@ static int __devinit sja1000_isa_probe(struct device *pdev, unsigned int idx)
>  	else
>  		priv->can.clock.freq = CLK_DEFAULT / 2;
>  
> -	if (ocr[idx] != -1)
> -		priv->ocr = ocr[idx] & 0xff;
> -	else if (ocr[0] != -1)
> -		priv->ocr = ocr[0] & 0xff;
> +	if (ocr[idx] != 0xff)
> +		priv->ocr = ocr[idx];
> +	else if (ocr[0] != 0xff)
> +		priv->ocr = ocr[0];
>  	else
>  		priv->ocr = OCR_DEFAULT;
>  
> -	if (cdr[idx] != -1)
> -		priv->cdr = cdr[idx] & 0xff;
> -	else if (cdr[0] != -1)
> -		priv->cdr = cdr[0] & 0xff;
> +	if (cdr[idx] != 0xff)
> +		priv->cdr = cdr[idx];
> +	else if (cdr[0] != 0xff)
> +		priv->cdr = cdr[0];
>  	else
>  		priv->cdr = CDR_DEFAULT;
>  


-- 
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