block: convert blkdev_issue_flush() to use empty barriers

Then we can get rid of ->issue_flush_fn() and all the driver private
implementations of that.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 0 insertions, 22 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 0a3a528212c2..69f542c4923c 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -826,27 +826,6 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
         return 0;
 }
 
-static int sd_issue_flush(struct request_queue *q, struct gendisk *disk,
-                          sector_t *error_sector)
-{
-        int ret = 0;
-        struct scsi_device *sdp = q->queuedata;
-        struct scsi_disk *sdkp;
-
-        if (sdp->sdev_state != SDEV_RUNNING)
-                return -ENXIO;
-
-        sdkp = scsi_disk_get_from_dev(&sdp->sdev_gendev);
-
-        if (!sdkp)
-               return -ENODEV;
-
-        if (sdkp->WCE)
-                ret = sd_sync_cache(sdkp);
-        scsi_disk_put(sdkp);
-        return ret;
-}
-
 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
 {
         memset(rq->cmd, 0, sizeof(rq->cmd));
@@ -1697,7 +1676,6 @@ static int sd_probe(struct device *dev)
         sd_revalidate_disk(gd);
 
         blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
-        blk_queue_issue_flush_fn(sdp->request_queue, sd_issue_flush);
 
         gd->driverfs_dev = &sdp->sdev_gendev;
         gd->flags = GENHD_FL_DRIVERFS;