linux-kernel - [PATCH 22/30] scsi: aic7xxx: aic7xxx_osm: Fix 'amount

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Date:   Wed,  8 Jul 2020 13:02:13 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        Lee Jones <lee.jones@...aro.org>,
        Hannes Reinecke <hare@...e.com>,
        "Daniel M. Eischen" <deischen@...rks.InterWorks.org>,
        Doug Ledford <dledford@...hat.com>
Subject: [PATCH 22/30] scsi: aic7xxx: aic7xxx_osm: Fix 'amount_xferred' set but not used issue

'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@...e.com>
Cc: "Daniel M. Eischen" <deischen@...rks.InterWorks.org>
Cc: Doug Ledford <dledford@...hat.com>
Signed-off-by: Lee Jones <lee.jones@...aro.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) {
-- 
2.25.1