linux-kernel - Re: [PATCH] olpc_battery: Fix endian neutral breakage for s16 values

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Date:	Fri, 24 Sep 2010 23:37:51 +0400
From:	Anton Vorontsov <cbouatmailru@...il.com>
To:	Daniel Drake <dsd@...top.org>
Cc:	dwmw2@...radead.org, linux-kernel@...r.kernel.org,
	richard@...top.org, dilinger@...ued.net
Subject: Re: [PATCH] olpc_battery: Fix endian neutral breakage for s16
 values

On Fri, Sep 24, 2010 at 08:31:33PM +0100, Daniel Drake wrote:
> From: Richard A. Smith <richard@...top.org>
> 
> When the driver was updated to be endian neutral (8e9c7716c)
> the signed part of the s16 values was lost.  This is because be16_to_cpu()
> returns a signed value.  This patch casts the values back to a s16 number
> prior to the the cast up to an int.
> 
> Signed-off-by: Richard A. Smith <richard@...top.org>
> Signed-off-by: Daniel Drake <dsd@...top.org>

Good catch.

[...]
> -		val->intval = (int)be16_to_cpu(ec_word) * 9760L / 32;
> +		val->intval = (int)((s16)be16_to_cpu(ec_word)) * 9760L / 32;

Do we really need "(int)" then?

Thanks,

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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