diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
index bec9f3193f60..80a8cb26cdea 100644
--- a/drivers/scsi/aacraid/commsup.c
+++ b/drivers/scsi/aacraid/commsup.c
@@ -2482,8 +2482,8 @@ int aac_command_thread(void *data)
 			/* Synchronize our watches */
 			if (((NSEC_PER_SEC - (NSEC_PER_SEC / HZ)) > now.tv_nsec)
 			 && (now.tv_nsec > (NSEC_PER_SEC / HZ)))
-				difference = (((NSEC_PER_SEC - now.tv_nsec) * HZ)
-				  + NSEC_PER_SEC / 2) / NSEC_PER_SEC;
+				difference = HZ + HZ / 2 -
+					     now.tv_nsec / (NSEC_PER_SEC / HZ);
 			else {
 				if (now.tv_nsec > NSEC_PER_SEC / 2)
 					++now.tv_sec;
@@ -2507,6 +2507,10 @@ int aac_command_thread(void *data)
 		if (kthread_should_stop())
 			break;
 
+		/*
+		 * we probably want usleep_range() here instead of the
+		 * jiffies computation
+		 */
 		schedule_timeout(difference);
 
 		if (kthread_should_stop())