linux-kernel - Re: [Patch] Signedness issue in drivers/net/phy/phy

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Date:	Sun, 20 Aug 2006 22:39:08 +0200
From:	Eric Sesterhenn <snakebyte@....de>
To:	Dave Jones <davej@...hat.com>
Cc:	Richard Knutsson <ricknu-0@...dent.ltu.se>,
	linux-kernel@...r.kernel.org, drzeus-sdhci@...eus.cx
Subject: Re: [Patch] Signedness issue in drivers/net/phy/phy_device.c

On Sun, 2006-08-20 at 15:16 -0400, Dave Jones wrote:
> On Sun, Aug 20, 2006 at 08:36:00PM +0200, Eric Sesterhenn / Snakebyte wrote:
>  > * Richard Knutsson (ricknu-0@...dent.ltu.se) wrote:
>  > > Eric Sesterhenn wrote:
>  > hi,
>  > 
>  > > Would it not be preferable to use a 's32' instead of an 'int'? After 
>  > > all, it seem 'val' needs to be 32 bits.
>  > 
>  > not sure, but wouldnt this collide with platforms where an int is 64
>  > Bits?
> 
> None of the 64-bit Linux ports use ILP64.

Here is an updated patch.

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, as proposed
by Richard Knutsson this patch changes val to s32. Currently it is an u32, so the < 0 check
always fails.

Signed-off-by: Eric Sesterhenn <snakebyte@....de>

--- linux-2.6.18-rc4/drivers/net/phy/phy_device.c.orig	2006-08-20 22:05:26.000000000 +0200
+++ linux-2.6.18-rc4/drivers/net/phy/phy_device.c	2006-08-20 22:05:42.000000000 +0200
@@ -513,7 +513,7 @@ EXPORT_SYMBOL(genphy_read_status);
 
 static int genphy_config_init(struct phy_device *phydev)
 {
-	u32 val;
+	s32 val;
 	u32 features;
 
 	/* For now, I'll claim that the generic driver supports


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