mmc: block: add a block request prepare function

Break out code from mmc_blk_issue_rw_rq to create a block request prepare
function. This doesn't change any functionallity. This helps when handling
more than one active block request.
Signed-off-by: Per Forlin <per.forlin@linaro.org>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Venkatraman S <svenkatr@ti.com>
Tested-by: Sourav Poddar <sourav.poddar@ti.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/card/block.c

@@ -812,12 +812,15 @@ static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
 	 R1_CC_ERROR |		/* Card controller error */		\
 	 R1_ERROR)		/* General/unknown error */
 
-static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
+static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
+			       struct mmc_card *card,
+			       int disable_multi,
+			       struct mmc_queue *mq)
 {
+	u32 readcmd, writecmd;
+	struct mmc_blk_request *brq = &mqrq->brq;
+	struct request *req = mqrq->req;
 	struct mmc_blk_data *md = mq->data;
-	struct mmc_card *card = md->queue.card;
-	struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
-	int ret = 1, disable_multi = 0, retry = 0;
 
 	/*
 	 * Reliable writes are used to implement Forced Unit Access and
@@ -828,9 +831,6 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
 		(rq_data_dir(req) == WRITE) &&
 		(md->flags & MMC_BLK_REL_WR);
 
-	do {
-		u32 readcmd, writecmd;
-
 	memset(brq, 0, sizeof(struct mmc_blk_request));
 	brq->mrq.cmd = &brq->cmd;
 	brq->mrq.data = &brq->data;
@@ -917,8 +917,8 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
 
 	mmc_set_data_timeout(&brq->data, card);
 
-		brq->data.sg = mq->mqrq_cur->sg;
-		brq->data.sg_len = mmc_queue_map_sg(mq, mq->mqrq_cur);
+	brq->data.sg = mqrq->sg;
+	brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
 
 	/*
 	 * Adjust the sg list so it is the same size as the
@@ -939,8 +939,18 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
 		brq->data.sg_len = i;
 	}
 
-		mmc_queue_bounce_pre(mq->mqrq_cur);
+	mmc_queue_bounce_pre(mqrq);
+}
 
+static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
+{
+	struct mmc_blk_data *md = mq->data;
+	struct mmc_card *card = md->queue.card;
+	struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
+	int ret = 1, disable_multi = 0, retry = 0;
+
+	do {
+		mmc_blk_rw_rq_prep(mq->mqrq_cur, card, disable_multi, mq);
 		mmc_wait_for_req(card->host, &brq->mrq);
 
 		mmc_queue_bounce_post(mq->mqrq_cur);