mmc: block: inline command abortions

Setting rqc to NULL followed by a goto to cmd_abort is just a way
to do unconditional abort without starting any new command.
Inline the calls to mmc_blk_rw_cmd_abort() and return immediately
in those cases.

Add some comments to the code flow so it is clear that this is
where the asynchronous requests come back in and the result of
them gets handled.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 13e6fe0..ea86a23 100644 (file)
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1649,9 +1649,8 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
                                !IS_ALIGNED(blk_rq_sectors(rqc), 8)) {
                                pr_err("%s: Transfer size is not 4KB sector size aligned\n",
                                        rqc->rq_disk->disk_name);
-                               req = rqc;
-                               rqc = NULL;
-                               goto cmd_abort;
+                               mmc_blk_rw_cmd_abort(card, rqc);
+                               return 0;
                        }
 
                        mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
@@ -1660,11 +1659,20 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
                        areq = NULL;
                areq = mmc_start_req(card->host, areq, &status);
                if (!areq) {
+                       /*
+                        * We have just put the first request into the pipeline
+                        * and there is nothing more to do until it is
+                        * complete.
+                        */
                        if (status == MMC_BLK_NEW_REQUEST)
                                mq->flags |= MMC_QUEUE_NEW_REQUEST;
                        return 0;
                }
 
+               /*
+                * An asynchronous request has been completed and we proceed
+                * to handle the result of it.
+                */
                mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
                brq = &mq_rq->brq;
                req = mq_rq->req;
@@ -1691,8 +1699,8 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
                                pr_err("%s BUG rq_tot %d d_xfer %d\n",
                                       __func__, blk_rq_bytes(req),
                                       brq->data.bytes_xfered);
-                               rqc = NULL;
-                               goto cmd_abort;
+                               mmc_blk_rw_cmd_abort(card, req);
+                               return 0;
                        }
                        break;
                case MMC_BLK_CMD_ERR: