linux-kernel - Re: [Patch] Signedness issue in drivers/scsi/ipr.c

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Date:	Sun, 20 Aug 2006 13:56:26 -0500
From:	Brian King <brking@...ibm.com>
To:	Eric Sesterhenn <snakebyte@....de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [Patch] Signedness issue in drivers/scsi/ipr.c

Eric Sesterhenn wrote:
> hi,
> 
> gcc 4.1 with some extra warnings show the following:
> 
> drivers/scsi/ipr.c:6361: warning: comparison of unsigned expression < 0 is always false
> drivers/scsi/ipr.c:6385: warning: comparison of unsigned expression < 0 is always false
> drivers/scsi/ipr.c:6415: warning: comparison of unsigned expression < 0 is always false

Acked-by: Brian King <brking@...ibm.com>

> 
> The problem is that rc is of the type u32, which can never be smaller than zero,
> therefore all three error handling checks get useless. This patch changes it to
> a normal int, because all usages / all functions it get used with expect an int.
> 
> Signed-off-by: Eric Sesterhenn <snakebyte@....de>
> 
> --- linux-2.6.18-rc4/drivers/scsi/ipr.c.orig	2006-08-19 21:10:18.000000000 +0200
> +++ linux-2.6.18-rc4/drivers/scsi/ipr.c	2006-08-19 21:10:25.000000000 +0200
> @@ -6324,7 +6324,7 @@ static int __devinit ipr_probe_ioa(struc
>  	struct Scsi_Host *host;
>  	unsigned long ipr_regs_pci;
>  	void __iomem *ipr_regs;
> -	u32 rc = PCIBIOS_SUCCESSFUL;
> +	int rc = PCIBIOS_SUCCESSFUL;
>  	volatile u32 mask, uproc;
>  
>  	ENTER;
> 
> 

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