[SCSI] aic79xx: use tcq functions

This patch converts aic79xx to use the midlayer-supplied tcq
functions.

We also set the queuedepth to '1' if tcq is disabled; the
aic79xx driver gets confused otherwise. Will set it back to
'2' once I figure out how to queue requests in the driver.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/aic7xxx/aic79xx_osm.c

@@ -1336,14 +1336,12 @@ ahd_platform_set_tags(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
 
 	switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
 	case AHD_DEV_Q_BASIC:
-		scsi_adjust_queue_depth(sdev,
-					MSG_SIMPLE_TASK,
-					dev->openings + dev->active);
+		scsi_set_tag_type(sdev, MSG_SIMPLE_TASK);
+		scsi_activate_tcq(sdev, dev->openings + dev->active);
 		break;
 	case AHD_DEV_Q_TAGGED:
-		scsi_adjust_queue_depth(sdev,
-					MSG_ORDERED_TASK,
-					dev->openings + dev->active);
+		scsi_set_tag_type(sdev, MSG_ORDERED_TASK);
+		scsi_activate_tcq(sdev, dev->openings + dev->active);
 		break;
 	default:
 		/*
@@ -1352,9 +1350,7 @@ ahd_platform_set_tags(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
 		 * serially on the controller/device.  This should
 		 * remove some latency.
 		 */
-		scsi_adjust_queue_depth(sdev,
-					/*NON-TAGGED*/0,
-					/*queue depth*/2);
+		scsi_deactivate_tcq(sdev, 1);
 		break;
 	}
 }