Re: [PATCH] fcoe: Remove redundant 'less than zero' check

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On Thu, 05 Jul 2012 07:52:25 -0700
Robert Love <robert.w.love@xxxxxxxxx> wrote:

> strtoul returns an 'unsigned long' so there is no
> reason to check if the value is less than zero.
> 
> strtoul already checks for the '-' character deep
> in its bowels. It will return an error if the user
> has provided a negative value and fcoe_str_to_dev_loss
> will return that error to its caller.

huh, I never knew that.  So if we feed -1 to kstrtoul() it gets treated
as an error?  That seems a bit surprising.  You're sure about that?

> This patch fixes the following Coverity reported warning:
> 
> CID 703581 -  NO_EFFECT Unsigned compared against 0 - This
> less-than-zero comparison of an unsigned value is never true. "*val < 0UL".
> drivers/scsi/fcoe/fcoe_sysfs.c:105
> 
> Signed-off-by: Robert Love <robert.w.love@xxxxxxxxx>
> ---
>  drivers/scsi/fcoe/fcoe_sysfs.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/fcoe/fcoe_sysfs.c b/drivers/scsi/fcoe/fcoe_sysfs.c
> index 2bc1631..5e75168 100644
> --- a/drivers/scsi/fcoe/fcoe_sysfs.c
> +++ b/drivers/scsi/fcoe/fcoe_sysfs.c
> @@ -102,7 +102,7 @@ static int fcoe_str_to_dev_loss(const char *buf, unsigned long *val)
>  	int ret;
>  
>  	ret = kstrtoul(buf, 0, val);
> -	if (ret || *val < 0)
> +	if (ret)
>  		return -EINVAL;
>  	/*
>  	 * Check for overflow; dev_loss_tmo is u32
--
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