mmc: queue: Factor out mmc_queue_alloc_bounce_sgs()

In preparation for supporting a queue of requests, factor out
mmc_queue_alloc_bounce_sgs().

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Harjani Ritesh <riteshh@codeaurora.org>
[Ulf: Fixed compiler warning]
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/card/queue.c

@@ -211,6 +211,30 @@ static bool mmc_queue_alloc_bounce_bufs(struct mmc_queue *mq,
 
 	return true;
 }
+
+static int mmc_queue_alloc_bounce_sgs(struct mmc_queue *mq,
+				      unsigned int bouncesz)
+{
+	struct mmc_queue_req *mqrq_cur = mq->mqrq_cur;
+	struct mmc_queue_req *mqrq_prev = mq->mqrq_prev;
+	int ret;
+
+	mqrq_cur->sg = mmc_alloc_sg(1, &ret);
+	if (ret)
+		return ret;
+
+	mqrq_cur->bounce_sg = mmc_alloc_sg(bouncesz / 512, &ret);
+	if (ret)
+		return ret;
+
+	mqrq_prev->sg = mmc_alloc_sg(1, &ret);
+	if (ret)
+		return ret;
+
+	mqrq_prev->bounce_sg = mmc_alloc_sg(bouncesz / 512, &ret);
+
+	return ret;
+}
 #endif
 
 /**
@@ -227,6 +251,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
 {
 	struct mmc_host *host = card->host;
 	u64 limit = BLK_BOUNCE_HIGH;
+	bool bounce = false;
 	int ret;
 	struct mmc_queue_req *mqrq_cur = &mq->mqrq[0];
 	struct mmc_queue_req *mqrq_prev = &mq->mqrq[1];
@@ -269,28 +294,15 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
 			blk_queue_max_segments(mq->queue, bouncesz / 512);
 			blk_queue_max_segment_size(mq->queue, bouncesz);
 
-			mqrq_cur->sg = mmc_alloc_sg(1, &ret);
-			if (ret)
-				goto cleanup_queue;
-
-			mqrq_cur->bounce_sg =
-				mmc_alloc_sg(bouncesz / 512, &ret);
-			if (ret)
-				goto cleanup_queue;
-
-			mqrq_prev->sg = mmc_alloc_sg(1, &ret);
-			if (ret)
-				goto cleanup_queue;
-
-			mqrq_prev->bounce_sg =
-				mmc_alloc_sg(bouncesz / 512, &ret);
+			ret = mmc_queue_alloc_bounce_sgs(mq, bouncesz);
 			if (ret)
 				goto cleanup_queue;
+			bounce = true;
 		}
 	}
 #endif
 
-	if (!mqrq_cur->bounce_buf && !mqrq_prev->bounce_buf) {
+	if (!bounce) {
 		blk_queue_bounce_limit(mq->queue, limit);
 		blk_queue_max_hw_sectors(mq->queue,
 			min(host->max_blk_count, host->max_req_size / 512));