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Subject: Re: [PATCH v2 21/29] scsi: aic7xxx: aic7xxx_osm: Fix 'amount_xferred'
 set but not used issue
To:     Lee Jones <lee.jones@linaro.org>, jejb@linux.ibm.com,
        martin.petersen@oracle.com
Cc:     linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
        Hannes Reinecke <hare@suse.com>,
        "Daniel M. Eischen" <deischen@iworks.InterWorks.org>,
        Doug Ledford <dledford@redhat.com>
References: <20200713074645.126138-1-lee.jones@linaro.org>
 <20200713074645.126138-22-lee.jones@linaro.org>
From:   Hannes Reinecke <hare@suse.de>
Message-ID: <097d4f3f-3d98-4bdc-b31f-5276a8160539@suse.de>
Date:   Tue, 14 Jul 2020 09:08:14 +0200
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On 7/13/20 9:46 AM, Lee Jones wrote:
> 'amount_xferred' is used, but only in certain circumstances.  Place
> the same stipulations on the defining/allocating of 'amount_xferred'
> as is placed when using it.
> 
> We've been careful not to change any of the ordering semantics here.
> 
> Fixes the following W=1 kernel build warning(s):
> 
>   drivers/scsi/aic7xxx/aic7xxx_osm.c: In function ‘ahc_done’:
>   drivers/scsi/aic7xxx/aic7xxx_osm.c:1725:12: warning: variable ‘amount_xferred’ set but not used [-Wunused-but-set-variable]
>   1725 | uint32_t amount_xferred;
>   | ^~~~~~~~~~~~~~
> 
> Cc: Hannes Reinecke <hare@suse.com>
> Cc: "Daniel M. Eischen" <deischen@iworks.InterWorks.org>
> Cc: Doug Ledford <dledford@redhat.com>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
> ---
>   drivers/scsi/aic7xxx/aic7xxx_osm.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
> index ed437c16de881..e7ccb8b80fc19 100644
> --- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
> +++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
> @@ -1711,10 +1711,12 @@ ahc_done(struct ahc_softc *ahc, struct scb *scb)
>   	 */
>   	cmd->sense_buffer[0] = 0;
>   	if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
> +#ifdef AHC_REPORT_UNDERFLOWS
>   		uint32_t amount_xferred;
>   
>   		amount_xferred =
>   		    ahc_get_transfer_length(scb) - ahc_get_residual(scb);
> +#endif
>   		if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
>   #ifdef AHC_DEBUG
>   			if ((ahc_debug & AHC_SHOW_MISC) != 0) {
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke            Teamlead Storage & Networking
hare@suse.de                               +49 911 74053 688
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