From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 09 Jul 2020 10:56:28 +0000
Subject: Re: [PATCH] scsi: lpfc: Fix a condition in lpfc_dmp_dbg()
Message-Id: <20200709105628.GG2571@kadam>
List-Id: <kernel-janitors.vger.kernel.org>
References: <20200709104919.GD20875@mwanda>
In-Reply-To: <20200709104919.GD20875@mwanda>
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To: James Smart <james.smart@broadcom.com>, Dick Kennedy <dick.kennedy@broadcom.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>, "Martin K. Petersen" <martin.petersen@oracle.com>, linux-scsi@vger.kernel.org, kernel-janitors@vger.kernel.org

On Thu, Jul 09, 2020 at 01:49:19PM +0300, Dan Carpenter wrote:
> These variables are unsigned so the result of the subtraction is also
> unsigned and thus can't be negative.  Change it to a comparison and
> remove the subtraction.
> 
> Fixes: 372c187b8a70 ("scsi: lpfc: Add an internal trace log buffer")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
>  drivers/scsi/lpfc/lpfc_init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
> index 7285b0114837..2bb2c96e7784 100644
> --- a/drivers/scsi/lpfc/lpfc_init.c
> +++ b/drivers/scsi/lpfc/lpfc_init.c
> @@ -14152,7 +14152,7 @@ void lpfc_dmp_dbg(struct lpfc_hba *phba)
>  		if ((start_idx + dbg_cnt) > (DBG_LOG_SZ - 1)) {
>  			temp_idx = (start_idx + dbg_cnt) % DBG_LOG_SZ;
>  		} else {
> -			if ((start_idx - dbg_cnt) < 0) {
> +			if (start_idx > dbg_cnt) {

Nope.  That's reversed.  I'm dumb.  Let me resend.

regards,
dan carpenter