linux-kernel - Re: [scsi] scsi: ufs: don't check unsigned type for a negative value

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Date:   Mon, 13 Mar 2017 17:19:01 -0700
From:   Subhash Jadavani <subhashj@...eaurora.org>
To:     Tomas Winkler <tomas.winkler@...el.com>
Cc:     James Bottomley <James.Bottomley@...senpartnership.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Vinayak Holikatti <vinholikatti@...il.com>,
        Christoph Hellwig <hch@....de>,
        Yaniv Gardi <ygardi@...eaurora.org>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [scsi] scsi: ufs: don't check unsigned type for a negative value

On 2017-03-12 03:22, Tomas Winkler wrote:
> Fix compilation warning
> 
> drivers/scsi/ufs/ufshcd.c:7645:13: warning: comparison of unsigned
> expression < 0 is always false [-Wtype-limits]
> if ((value < UFS_PM_LVL_0) || (value >= UFS_PM_LVL_MAX))
> 
> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> ---
>  drivers/scsi/ufs/ufshcd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 1359913bf840..e8c26e6e6237 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -7642,7 +7642,7 @@ static inline ssize_t ufshcd_pm_lvl_store(struct
> device *dev,
>  	if (kstrtoul(buf, 0, &value))
>  		return -EINVAL;
> 
> -	if ((value < UFS_PM_LVL_0) || (value >= UFS_PM_LVL_MAX))
> +	if (value >= UFS_PM_LVL_MAX)
>  		return -EINVAL;
> 
>  	spin_lock_irqsave(hba->host->host_lock, flags);

LGTM.
Reviewed-by: Subhash Jadavani <subhashj@...aurora.org>

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