linux-kernel - Re: [PATCHv3 10/14] HSI: Introduce driver for SSI Protocol

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Date:	Sat, 19 Apr 2014 21:49:36 +0200
From:	Pavel Machek <pavel@....cz>
To:	Sebastian Reichel <sre@...nel.org>
Cc:	Sebastian Reichel <sre@...g0.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Shubhrajyoti Datta <omaplinuxkernel@...il.com>,
	Carlos Chinea <cch.devel@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	Pali Rohár <pali.rohar@...il.com>,
	Ивайло Димитров 
	<freemangordon@....bg>,
	Joni Lapilainen <joni.lapilainen@...il.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Carlos Chinea <carlos.chinea@...ia.com>
Subject: Re: [PATCHv3 10/14] HSI: Introduce driver for SSI Protocol

Hi!

> This adds a driver for the SSI McSAAB protocol as used in
> the Nokia N900.
> 
> Signed-off-by: Carlos Chinea <carlos.chinea@...ia.com>
> Signed-off-by: Sebastian Reichel <sre@...nel.org>

> +#define SSIP_MIN_PN_HDR		6	/* FIXME: Revisit */
> +#define SSIP_WDTOUT		2000	/* FIXME: has to be 500 msecs> */

Can they be fixed now, or do they have to wait?


> +#ifdef __LITTLE_ENDIAN
> +	((u16 *)skb->data)[2] = swab16(((u16 *)skb->data)[2]);
> +	dev_dbg(&dev->dev, "RX length fixed (%04x -> %u)\n",
> +			((u16 *)skb->data)[2], ntohs(((u16 *)skb->data)[2]));
> +#endif

Uh. Can this be replaced by
    ((u16 *)skb->data)[2] = htons(((u16 *)skb->data)[2]);

(without the ifdef?)

> +	/*
> +	 * Modem sends Phonet messages over SSI with its own endianess...
> +	 * Assume that modem has the same endianess as we do.
> +	 */
> +	if (skb_cow_head(skb, 0))
> +		goto drop;
> +#ifdef __LITTLE_ENDIAN
> +	((u16 *)skb->data)[2] = swab16(((u16 *)skb->data)[2]);
> +#endif

Here, too?

But it looks like the comment does not match the code, because we
swap.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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