linux-kernel - Re: [PATCH] Staging: olpc_dcon: replace some magic numbers

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Message-ID: <20130803231447.GF5051@mwanda>
Date:	Sun, 4 Aug 2013 02:14:47 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Jens Frederich <jfrederich@...il.com>
Cc:	gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
	cjb@...top.org, linux-kernel@...r.kernel.org, dilinger@...ued.net
Subject: Re: [PATCH] Staging: olpc_dcon: replace some magic numbers

On Sat, Aug 03, 2013 at 10:44:35PM +0200, Jens Frederich wrote:
> @@ -126,7 +127,7 @@ static int dcon_bus_stabilize(struct dcon_priv *dcon, int is_powered_down)
>  power_up:
>  	if (is_powered_down) {
>  		x = 1;
> -		x = olpc_ec_cmd(0x26, (unsigned char *)&x, 1, NULL, 0);
> +		x = olpc_ec_cmd(EC_DCON_POWER_MODE, (u8 *)&x, 1, NULL, 0);
                                                    ^^^^^^^^
You didn't introduce this but using "x" as the inbuf here messy.
It should be char instead of an int.  The code won't work on big
endian systems.  I know this hardware is only available on little
endian systems and that's why it's not a bug.  It's just an ugly
thing to do.

(Since you didn't introduce this, it means your patch is fine and
you can ignore this email.  I am just commenting in case anyone
wants to fix clean it up).

>  		if (x) {
>  			pr_warn("unable to force dcon to power up: %d!\n", x);
>  			return x;

regards,
dan carpenter
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