mmc: deprecate mmc bus topology

The classic MMC bus was defined as multi card bus
system, which is reflected in the design in the MMC
layer.

When SD showed up, the bus topology was abandoned
and a star topology (one card per host) was mandated.
MMC version 4 has followed this, officially deprecating
the bus topology.

As we do not have any known users of the bus
topology we can remove support for it. This will
simplify the code and rectify some incorrect
assumptions in the newer additions.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

drivers/mmc/card/block.c

@@ -226,8 +226,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 	struct mmc_blk_request brq;
 	int ret = 1, sg_pos, data_size;
 
-	if (mmc_card_claim_host(card))
-		goto flush_queue;
+	mmc_claim_host(card->host);
 
 	do {
 		struct mmc_command cmd;
@@ -357,7 +356,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 		spin_unlock_irq(&md->lock);
 	} while (ret);
 
-	mmc_card_release_host(card);
+	mmc_release_host(card->host);
 
 	return 1;
 
@@ -393,9 +392,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 		spin_unlock_irq(&md->lock);
 	}
 
-flush_queue:
-
-	mmc_card_release_host(card);
+	mmc_release_host(card->host);
 
 	spin_lock_irq(&md->lock);
 	while (ret) {
@@ -526,12 +523,12 @@ mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 	if (mmc_card_blockaddr(card))
 		return 0;
 
-	mmc_card_claim_host(card);
+	mmc_claim_host(card->host);
 	cmd.opcode = MMC_SET_BLOCKLEN;
 	cmd.arg = 1 << md->block_bits;
 	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 	err = mmc_wait_for_cmd(card->host, &cmd, 5);
-	mmc_card_release_host(card);
+	mmc_release_host(card->host);
 
 	if (err) {
 		printk(KERN_ERR "%s: unable to set block size to %d: %d\n",