Re: [Patch] Signedness issue in drivers/net/phy/phy_device.c

[Richard Knutsson <ricknu-0@student.ltu.se>]

Eric Sesterhenn wrote:

> hi,
>  
hello

> while checking gcc 4.1 -Wextra warnings, I stumbled across the following
> two warnings:
>
> drivers/net/phy/phy_device.c:528: warning: comparison of unsigned expression < 0 is always false
> drivers/net/phy/phy_device.c:546: warning: comparison of unsigned expression < 0 is always false
>
> Since phy_read() returns an integer and can return negative values, it
> seems to me the best way to get proper error handling working again
> is to make val an int. Currently it is an u32, so the < 0 check
> always fails.
>
> Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
>
> --- linux-2.6.18-rc4/drivers/net/phy/phy_device.c.orig	2006-08-19 18:22:56.000000000 +0200
> +++ linux-2.6.18-rc4/drivers/net/phy/phy_device.c	2006-08-19 18:24:49.000000000 +0200
> @@ -513,7 +513,7 @@ EXPORT_SYMBOL(genphy_read_status);
>
> static int genphy_config_init(struct phy_device *phydev)
> {
> -	u32 val;
> +	int val;
>  
Would it not be preferable to use a 's32' instead of an 'int'? After 
all, it seem 'val' needs to be 32 bits.

Just a thought
/Richard
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