linux-kernel - Re: [PATCH 4/8] drivers/i2c/busses/i2c-pasemi.c: Fix unsigned return type

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Date:	Mon, 6 Sep 2010 11:30:44 -0500
From:	Olof Johansson <olof@...om.net>
To:	Julia Lawall <julia@...u.dk>
Cc:	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-i2c@...r.kernel.org,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	"Jean Delvare (PC drivers, core)" <khali@...ux-fr.org>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 4/8] drivers/i2c/busses/i2c-pasemi.c: Fix unsigned
	return type

On Sun, Sep 05, 2010 at 09:00:22PM +0200, Julia Lawall wrote:
> The function has an unsigned return type, but returns a negative constant
> to indicate an error condition.  The result of calling the function is
> always stored in a variable of type (signed) int, and thus unsigned can be
> dropped from the return type.
> 
> A sematic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @exists@
> identifier f;
> constant C;
> @@
> 
>  unsigned f(...)
>  { <+...
> *  return -C;
>  ...+> }
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>

Acked-by: Olof Johansson <olof@...om.net>

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