[PATCH 13/16] mmc: queue: issue struct mmc_queue_req items

[Linus Walleij <linus.walleij@linaro.org>]

Instead of passing two pointers around and messing and reassigning
to the left and right, issue mmc_queue_req and dereference
the queue from the request where needed. The struct mmc_queue_req
is the thing that has a lifecycle after all: this is what we are
keepin in out queue. Augment all users to be passed the struct
mmc_queue_req as well.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/mmc/core/block.c | 88 ++++++++++++++++++++++++------------------------
 drivers/mmc/core/block.h |  5 ++-
 drivers/mmc/core/queue.c |  6 ++--
 3 files changed, 50 insertions(+), 49 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 4952a105780e..628a22b9bf41 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1151,9 +1151,9 @@ int mmc_access_rpmb(struct mmc_queue *mq)
 	return false;
 }
 
-static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
+static void mmc_blk_issue_discard_rq(struct mmc_queue_req *mq_rq)
 {
-	struct mmc_blk_data *md = mq->blkdata;
+	struct mmc_blk_data *md = mq_rq->mq->blkdata;
 	struct mmc_card *card = md->queue.card;
 	unsigned int from, nr, arg;
 	int err = 0, type = MMC_BLK_DISCARD;
@@ -1163,8 +1163,8 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 		goto fail;
 	}
 
-	from = blk_rq_pos(req);
-	nr = blk_rq_sectors(req);
+	from = blk_rq_pos(mq_rq->req);
+	nr = blk_rq_sectors(mq_rq->req);
 
 	if (mmc_can_discard(card))
 		arg = MMC_DISCARD_ARG;
@@ -1188,13 +1188,12 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 	if (!err)
 		mmc_blk_reset_success(md, type);
 fail:
-	blk_end_request(req, err, blk_rq_bytes(req));
+	blk_end_request(mq_rq->req, err, blk_rq_bytes(mq_rq->req));
 }
 
-static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
-				       struct request *req)
+static void mmc_blk_issue_secdiscard_rq(struct mmc_queue_req *mq_rq)
 {
-	struct mmc_blk_data *md = mq->blkdata;
+	struct mmc_blk_data *md = mq_rq->mq->blkdata;
 	struct mmc_card *card = md->queue.card;
 	unsigned int from, nr, arg;
 	int err = 0, type = MMC_BLK_SECDISCARD;
@@ -1204,8 +1203,8 @@ static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
 		goto out;
 	}
 
-	from = blk_rq_pos(req);
-	nr = blk_rq_sectors(req);
+	from = blk_rq_pos(mq_rq->req);
+	nr = blk_rq_sectors(mq_rq->req);
 
 	if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
 		arg = MMC_SECURE_TRIM1_ARG;
@@ -1253,12 +1252,12 @@ static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
 	if (!err)
 		mmc_blk_reset_success(md, type);
 out:
-	blk_end_request(req, err, blk_rq_bytes(req));
+	blk_end_request(mq_rq->req, err, blk_rq_bytes(mq_rq->req));
 }
 
-static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
+static void mmc_blk_issue_flush(struct mmc_queue_req *mq_rq)
 {
-	struct mmc_blk_data *md = mq->blkdata;
+	struct mmc_blk_data *md = mq_rq->mq->blkdata;
 	struct mmc_card *card = md->queue.card;
 	int ret = 0;
 
@@ -1266,7 +1265,7 @@ static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
 	if (ret)
 		ret = -EIO;
 
-	blk_end_request_all(req, ret);
+	blk_end_request_all(mq_rq->req, ret);
 }
 
 /*
@@ -1614,11 +1613,13 @@ static void mmc_blk_rw_cmd_abort(struct mmc_card *card, struct request *req)
  * @mq: the queue with the card and host to restart
  * @req: a new request that want to be started after the current one
  */
-static void mmc_blk_rw_try_restart(struct mmc_queue *mq)
+static void mmc_blk_rw_try_restart(struct mmc_queue_req *mq_rq)
 {
+	struct mmc_queue *mq = mq_rq->mq;
+
 	/* Proceed and try to restart the current async request */
-	mmc_blk_rw_rq_prep(mq->mqrq_cur, mq->card, 0, mq);
-	mmc_restart_areq(mq->card->host, &mq->mqrq_cur->areq);
+	mmc_blk_rw_rq_prep(mq_rq, mq->card, 0, mq);
+	mmc_restart_areq(mq->card->host, &mq_rq->areq);
 }
 
 void mmc_blk_rw_done(struct mmc_async_req *areq,
@@ -1676,11 +1677,11 @@ void mmc_blk_rw_done(struct mmc_async_req *areq,
 		req_pending = mmc_blk_rw_cmd_err(md, card, brq, old_req, req_pending);
 		if (mmc_blk_reset(md, host, type)) {
 			mmc_blk_rw_cmd_abort(card, old_req);
-			mmc_blk_rw_try_restart(mq);
+			mmc_blk_rw_try_restart(mq_rq);
 			return;
 		}
 		if (!req_pending) {
-			mmc_blk_rw_try_restart(mq);
+			mmc_blk_rw_try_restart(mq_rq);
 			return;
 		}
 		break;
@@ -1693,7 +1694,7 @@ void mmc_blk_rw_done(struct mmc_async_req *areq,
 		if (!mmc_blk_reset(md, host, type))
 			break;
 		mmc_blk_rw_cmd_abort(card, old_req);
-		mmc_blk_rw_try_restart(mq);
+		mmc_blk_rw_try_restart(mq_rq);
 		return;
 	case MMC_BLK_DATA_ERR: {
 		int err;
@@ -1702,7 +1703,7 @@ void mmc_blk_rw_done(struct mmc_async_req *areq,
 			break;
 		if (err == -ENODEV) {
 			mmc_blk_rw_cmd_abort(card, old_req);
-			mmc_blk_rw_try_restart(mq);
+			mmc_blk_rw_try_restart(mq_rq);
 			return;
 		}
 		/* Fall through */
@@ -1723,19 +1724,19 @@ void mmc_blk_rw_done(struct mmc_async_req *areq,
 		req_pending = blk_end_request(old_req, -EIO,
 					      brq->data.blksz);
 		if (!req_pending) {
-			mmc_blk_rw_try_restart(mq);
+			mmc_blk_rw_try_restart(mq_rq);
 			return;
 		}
 		break;
 	case MMC_BLK_NOMEDIUM:
 		mmc_blk_rw_cmd_abort(card, old_req);
-		mmc_blk_rw_try_restart(mq);
+		mmc_blk_rw_try_restart(mq_rq);
 		return;
 	default:
 		pr_err("%s: Unhandled return value (%d)",
 		       old_req->rq_disk->disk_name, status);
 		mmc_blk_rw_cmd_abort(card, old_req);
-		mmc_blk_rw_try_restart(mq);
+		mmc_blk_rw_try_restart(mq_rq);
 		return;
 	}
 
@@ -1747,15 +1748,16 @@ void mmc_blk_rw_done(struct mmc_async_req *areq,
 		mmc_blk_rw_rq_prep(mq_rq, card,
 				   disable_multi, mq);
 		mq_rq->brq.retune_retry_done = retune_retry_done;
-		mmc_restart_areq(host, &mq->mqrq_cur->areq);
+		mmc_restart_areq(host, &mq_rq->areq);
 	}
 }
 
-static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
+static void mmc_blk_issue_rw_rq(struct mmc_queue_req *mq_rq)
 {
+	struct mmc_queue *mq = mq_rq->mq;
 	struct mmc_card *card = mq->card;
 
-	if (!new_req) {
+	if (!mq_rq->req) {
 		pr_err("%s: NULL request!\n", __func__);
 		return;
 	}
@@ -1765,54 +1767,52 @@ static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
 	 * multiple read or write is allowed
 	 */
 	if (mmc_large_sector(card) &&
-	    !IS_ALIGNED(blk_rq_sectors(new_req), 8)) {
+	    !IS_ALIGNED(blk_rq_sectors(mq_rq->req), 8)) {
 		pr_err("%s: Transfer size is not 4KB sector size aligned\n",
-		       new_req->rq_disk->disk_name);
-		mmc_blk_rw_cmd_abort(card, new_req);
+		       mq_rq->req->rq_disk->disk_name);
+		mmc_blk_rw_cmd_abort(card, mq_rq->req);
 		return;
 	}
 
-	mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
-	mmc_start_areq(card->host, &mq->mqrq_cur->areq);
+	mmc_blk_rw_rq_prep(mq_rq, card, 0, mq);
+	mmc_start_areq(card->host, &mq_rq->areq);
 }
 
-void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
+void mmc_blk_issue_rq(struct mmc_queue_req *mq_rq)
 {
 	int ret;
-	struct mmc_blk_data *md = mq->blkdata;
+	struct mmc_blk_data *md = mq_rq->mq->blkdata;
 	struct mmc_card *card = md->queue.card;
 
 	ret = mmc_blk_part_switch(card, md);
 	if (ret) {
-		if (req) {
-			blk_end_request_all(req, -EIO);
-		}
+		blk_end_request_all(mq_rq->req, -EIO);
 		return;
 	}
 
-	if (req && req_op(req) == REQ_OP_DISCARD) {
+	if (req_op(mq_rq->req) == REQ_OP_DISCARD) {
 		/* complete ongoing async transfer before issuing discard */
 		if (card->host->areq) {
 			wait_for_completion(&card->host->areq->complete);
 			card->host->areq = NULL;
 		}
-		mmc_blk_issue_discard_rq(mq, req);
-	} else if (req && req_op(req) == REQ_OP_SECURE_ERASE) {
+		mmc_blk_issue_discard_rq(mq_rq);
+	} else if (req_op(mq_rq->req) == REQ_OP_SECURE_ERASE) {
 		/* complete ongoing async transfer before issuing secure erase*/
 		if (card->host->areq) {
 			wait_for_completion(&card->host->areq->complete);
 			card->host->areq = NULL;
 		}
-		mmc_blk_issue_secdiscard_rq(mq, req);
-	} else if (req && req_op(req) == REQ_OP_FLUSH) {
+		mmc_blk_issue_secdiscard_rq(mq_rq);
+	} else if (req_op(mq_rq->req) == REQ_OP_FLUSH) {
 		/* complete ongoing async transfer before issuing flush */
 		if (card->host->areq) {
 			wait_for_completion(&card->host->areq->complete);
 			card->host->areq = NULL;
 		}
-		mmc_blk_issue_flush(mq, req);
+		mmc_blk_issue_flush(mq_rq);
 	} else {
-		mmc_blk_issue_rw_rq(mq, req);
+		mmc_blk_issue_rw_rq(mq_rq);
 	}
 }
 
diff --git a/drivers/mmc/core/block.h b/drivers/mmc/core/block.h
index b4b489911599..0326fa5d8217 100644
--- a/drivers/mmc/core/block.h
+++ b/drivers/mmc/core/block.h
@@ -3,10 +3,9 @@
 
 struct mmc_async_req;
 enum mmc_blk_status;
-struct mmc_queue;
-struct request;
+struct mmc_queue_req;
 
 void mmc_blk_rw_done(struct mmc_async_req *areq, enum mmc_blk_status status);
-void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req);
+void mmc_blk_issue_rq(struct mmc_queue_req *mq_rq);
 
 #endif
diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index c9f28de7b0f4..c4e1ced55796 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -54,6 +54,7 @@ static int mmc_queue_thread(void *d)
 	struct mmc_queue *mq = d;
 	struct request_queue *q = mq->queue;
 	bool claimed_host = false;
+	struct mmc_queue_req *mq_rq;
 
 	current->flags |= PF_MEMALLOC;
 
@@ -65,7 +66,8 @@ static int mmc_queue_thread(void *d)
 		set_current_state(TASK_INTERRUPTIBLE);
 		req = blk_fetch_request(q);
 		mq->asleep = false;
-		mq->mqrq_cur->req = req;
+		mq_rq = mq->mqrq_cur;
+		mq_rq->req = req;
 		spin_unlock_irq(q->queue_lock);
 
 		if (req) {
@@ -74,7 +76,7 @@ static int mmc_queue_thread(void *d)
 			if (!claimed_host)
 				mmc_get_card(mq->card);
 			set_current_state(TASK_RUNNING);
-			mmc_blk_issue_rq(mq, req);
+			mmc_blk_issue_rq(mq_rq);
 			cond_resched();
 			/*
 			 * Current request becomes previous request
-- 
2.9.3