linux-kernel - Re: [PATCH v2 23/24] scsi: aic7xxx: aic79xx_osm: Fix 'amount

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Date:   Tue, 14 Jul 2020 09:47:00 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Lee Jones <lee.jones@...aro.org>, jejb@...ux.ibm.com,
        martin.petersen@...cle.com
Cc:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        Hannes Reinecke <hare@...e.com>
Subject: Re: [PATCH v2 23/24] scsi: aic7xxx: aic79xx_osm: Fix 'amount_xferred'
 set but not used issue

On 7/13/20 10:00 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/aic79xx_osm.c: In function ‘ahd_done’:
>  drivers/scsi/aic7xxx/aic79xx_osm.c:1796:12: warning: variable ‘amount_xferred’ set but not used [-Wunused-but-set-variable]
> 
> Cc: Hannes Reinecke <hare@...e.com>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/scsi/aic7xxx/aic79xx_osm.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
> index 8e43ff86e0a60..3782a20d58885 100644
> --- a/drivers/scsi/aic7xxx/aic79xx_osm.c
> +++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
> @@ -1787,10 +1787,12 @@ ahd_done(struct ahd_softc *ahd, struct scb *scb)
>  	 */
>  	cmd->sense_buffer[0] = 0;
>  	if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
> +#ifdef AHD_REPORT_UNDERFLOWS
>  		uint32_t amount_xferred;
>  
>  		amount_xferred =
>  		    ahd_get_transfer_length(scb) - ahd_get_residual(scb);
> +#endif
>  		if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
>  #ifdef AHD_DEBUG
>  			if ((ahd_debug & AHD_SHOW_MISC) != 0) {
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@...e.de			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer