linux-kernel - Re: [PATCH 1/2] scsi: qla2xxx: remove incorrect byte swap

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Date:   Fri, 30 Jun 2017 09:41:57 -0700
From:   James Bottomley <jejb@...ux.vnet.ibm.com>
To:     Arnd Bergmann <arnd@...db.de>, qla2xxx-upstream@...gic.com,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Himanshu Madhani <himanshu.madhani@...ium.com>,
        Darren Trapp <darren.trapp@...ium.com>,
        Giridhar Malavali <giridhar.malavali@...ium.com>,
        Duane Grigsby <duane.grigsby@...ium.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] scsi: qla2xxx: remove incorrect byte swap

On Fri, 2017-06-30 at 18:10 +0200, Arnd Bergmann wrote:
> cont_pkt->entry_type is an 8-bit field, so doing a 32-bit byteswap
> on it will store incorrect data:
> 
> drivers/scsi/qla2xxx/qla_nvme.c: In function 'qla2x00_start_nvme_mq':
> include/uapi/linux/byteorder/big_endian.h:32:26: error: large integer
> implicitly truncated to unsigned type [-Werror=overflow]
> drivers/scsi/qla2xxx/qla_nvme.c:444:27: note: in expansion of macro
> 'cpu_to_le32'
>     cont_pkt->entry_type = cpu_to_le32(CONTINUE_A64_TYPE);
> 
> This removes the erroneous cpu_to_le32().
> 
> Fixes: e84067d74301 ("scsi: qla2xxx: Add FC-NVMe F/W initialization
> and transport registration")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/scsi/qla2xxx/qla_nvme.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/qla2xxx/qla_nvme.c
> b/drivers/scsi/qla2xxx/qla_nvme.c
> index 1da8fa8f641d..14e25e32e622 100644
> --- a/drivers/scsi/qla2xxx/qla_nvme.c
> +++ b/drivers/scsi/qla2xxx/qla_nvme.c
> @@ -441,7 +441,7 @@ static int qla2x00_start_nvme_mq(srb_t *sp)
>  				req->ring_ptr++;
>  			}
>  			cont_pkt = (cont_a64_entry_t *)req-
> >ring_ptr;
> -			cont_pkt->entry_type =
> cpu_to_le32(CONTINUE_A64_TYPE);
> +			cont_pkt->entry_type = CONTINUE_A64_TYPE;
> 

We already have a patch proposed for this, but I think it may be wrong
(it's the same as yours, so yours may be wrong too) see the handling in
qla_iocb.c

James