From: Linus Walleij <linus.walleij@linaro.org>
Date: Fri, 19 May 2017 15:37:27 +0200
Subject: mmc: block: remove req back pointer
Git-commit: 67e69d5220c904238f94bb2e6001d7c590f5a0bb
Patch-mainline: v4.13-rc1
References: FATE#324519

Just as we can use blk_mq_rq_from_pdu() to get the per-request
tag we can use blk_mq_rq_to_pdu() to get a request from a tag.
Introduce a static inline helper so we are on the clear what
is happening.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.com>
---
 drivers/mmc/core/block.c |    8 ++++----
 drivers/mmc/core/queue.c |   13 +++++--------
 drivers/mmc/core/queue.h |    8 +++++++-
 3 files changed, 16 insertions(+), 13 deletions(-)

--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1371,7 +1371,7 @@ static enum mmc_blk_status mmc_blk_err_c
 	struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
 						    areq);
 	struct mmc_blk_request *brq = &mq_mrq->brq;
-	struct request *req = mq_mrq->req;
+	struct request *req = mmc_queue_req_to_req(mq_mrq);
 	int need_retune = card->host->need_retune;
 	bool ecc_err = false;
 	bool gen_err = false;
@@ -1478,7 +1478,7 @@ static void mmc_blk_data_prep(struct mmc
 	struct mmc_blk_data *md = mq->blkdata;
 	struct mmc_card *card = md->queue.card;
 	struct mmc_blk_request *brq = &mqrq->brq;
-	struct request *req = mqrq->req;
+	struct request *req = mmc_queue_req_to_req(mqrq);
 
 	/*
 	 * Reliable writes are used to implement Forced Unit Access and
@@ -1583,7 +1583,7 @@ static void mmc_blk_rw_rq_prep(struct mm
 {
 	u32 readcmd, writecmd;
 	struct mmc_blk_request *brq = &mqrq->brq;
-	struct request *req = mqrq->req;
+	struct request *req = mmc_queue_req_to_req(mqrq);
 	struct mmc_blk_data *md = mq->blkdata;
 	bool do_rel_wr, do_data_tag;
 
@@ -1765,7 +1765,7 @@ static void mmc_blk_issue_rw_rq(struct m
 		 */
 		mq_rq =	container_of(old_areq, struct mmc_queue_req, areq);
 		brq = &mq_rq->brq;
-		old_req = mq_rq->req;
+		old_req = mmc_queue_req_to_req(mq_rq);
 		type = rq_data_dir(old_req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
 		mmc_queue_bounce_post(mq_rq);
 
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -184,8 +184,6 @@ static int mmc_init_request(struct reque
 	struct mmc_card *card = mq->card;
 	struct mmc_host *host = card->host;
 
-	mq_rq->req = req;
-
 	if (card->bouncesz) {
 		mq_rq->bounce_buf = kmalloc(card->bouncesz, gfp);
 		if (!mq_rq->bounce_buf)
@@ -223,8 +221,6 @@ static void mmc_exit_request(struct requ
 
 	kfree(mq_rq->sg);
 	mq_rq->sg = NULL;
-
-	mq_rq->req = NULL;
 }
 
 /**
@@ -373,12 +369,13 @@ unsigned int mmc_queue_map_sg(struct mmc
 	unsigned int sg_len;
 	size_t buflen;
 	struct scatterlist *sg;
+	struct request *req = mmc_queue_req_to_req(mqrq);
 	int i;
 
 	if (!mqrq->bounce_buf)
-		return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
+		return blk_rq_map_sg(mq->queue, req, mqrq->sg);
 
-	sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
+	sg_len = blk_rq_map_sg(mq->queue, req, mqrq->bounce_sg);
 
 	mqrq->bounce_sg_len = sg_len;
 
@@ -400,7 +397,7 @@ void mmc_queue_bounce_pre(struct mmc_que
 	if (!mqrq->bounce_buf)
 		return;
 
-	if (rq_data_dir(mqrq->req) != WRITE)
+	if (rq_data_dir(mmc_queue_req_to_req(mqrq)) != WRITE)
 		return;
 
 	sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
@@ -416,7 +413,7 @@ void mmc_queue_bounce_post(struct mmc_qu
 	if (!mqrq->bounce_buf)
 		return;
 
-	if (rq_data_dir(mqrq->req) != READ)
+	if (rq_data_dir(mmc_queue_req_to_req(mqrq)) != READ)
 		return;
 
 	sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
--- a/drivers/mmc/core/queue.h
+++ b/drivers/mmc/core/queue.h
@@ -20,6 +20,13 @@ static inline bool mmc_req_is_special(st
 		 req_op(req) == REQ_OP_SECURE_ERASE);
 }
 
+struct mmc_queue_req;
+
+static inline struct request *mmc_queue_req_to_req(struct mmc_queue_req *mqr)
+{
+	return blk_mq_rq_from_pdu(mqr);
+}
+
 struct task_struct;
 struct mmc_blk_data;
 struct mmc_blk_ioc_data;
@@ -34,7 +41,6 @@ struct mmc_blk_request {
 };
 
 struct mmc_queue_req {
-	struct request		*req;
 	struct mmc_blk_request	brq;
 	struct scatterlist	*sg;
 	char			*bounce_buf;