1 files changed, 18 insertions, 13 deletions

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 6b8d5cd7dbf6..f336a9b85576 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -73,7 +73,7 @@ static void blktrans_dev_put(struct mtd_blktrans_dev *dev)
 }
 
 
-static int do_blktrans_request(struct mtd_blktrans_ops *tr,
+static blk_status_t do_blktrans_request(struct mtd_blktrans_ops *tr,
 			       struct mtd_blktrans_dev *dev,
 			       struct request *req)
 {
@@ -84,33 +84,37 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
 	nsect = blk_rq_cur_bytes(req) >> tr->blkshift;
 	buf = bio_data(req->bio);
 
-	if (req_op(req) == REQ_OP_FLUSH)
-		return tr->flush(dev);
+	if (req_op(req) == REQ_OP_FLUSH) {
+		if (tr->flush(dev))
+			return BLK_STS_IOERR;
+		return BLK_STS_OK;
+	}
 
 	if (blk_rq_pos(req) + blk_rq_cur_sectors(req) >
 	    get_capacity(req->rq_disk))
-		return -EIO;
+		return BLK_STS_IOERR;
 
 	switch (req_op(req)) {
 	case REQ_OP_DISCARD:
-		return tr->discard(dev, block, nsect);
+		if (tr->discard(dev, block, nsect))
+			return BLK_STS_IOERR;
+		return BLK_STS_OK;
 	case REQ_OP_READ:
 		for (; nsect > 0; nsect--, block++, buf += tr->blksize)
 			if (tr->readsect(dev, block, buf))
-				return -EIO;
+				return BLK_STS_IOERR;
 		rq_flush_dcache_pages(req);
-		return 0;
+		return BLK_STS_OK;
 	case REQ_OP_WRITE:
 		if (!tr->writesect)
-			return -EIO;
+			return BLK_STS_IOERR;
 
 		rq_flush_dcache_pages(req);
 		for (; nsect > 0; nsect--, block++, buf += tr->blksize)
 			if (tr->writesect(dev, block, buf))
-				return -EIO;
-		return 0;
+				return BLK_STS_IOERR;
 	default:
-		return -EIO;
+		return BLK_STS_IOERR;
 	}
 }
 
@@ -132,7 +136,7 @@ static void mtd_blktrans_work(struct work_struct *work)
 	spin_lock_irq(rq->queue_lock);
 
 	while (1) {
-		int res;
+		blk_status_t res;
 
 		dev->bg_stop = false;
 		if (!req && !(req = blk_fetch_request(rq))) {
@@ -178,7 +182,7 @@ static void mtd_blktrans_request(struct request_queue *rq)
 
 	if (!dev)
 		while ((req = blk_fetch_request(rq)) != NULL)
-			__blk_end_request_all(req, -ENODEV);
+			__blk_end_request_all(req, BLK_STS_IOERR);
 	else
 		queue_work(dev->wq, &dev->work);
 }
@@ -413,6 +417,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
 	new->rq->queuedata = new;
 	blk_queue_logical_block_size(new->rq, tr->blksize);
 
+	blk_queue_bounce_limit(new->rq, BLK_BOUNCE_HIGH);
 	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, new->rq);
 	queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, new->rq);