linux-kernel - [PATCH V14 18/24] mmc: block: blk-mq: Separate card polling from recovery

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Date:   Tue, 21 Nov 2017 15:42:44 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Bough Chen <haibo.chen@....com>,
        Alex Lemberg <alex.lemberg@...disk.com>,
        Mateusz Nowak <mateusz.nowak@...el.com>,
        Yuliy Izrailov <Yuliy.Izrailov@...disk.com>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Dong Aisheng <dongas86@...il.com>,
        Das Asutosh <asutoshd@...eaurora.org>,
        Zhangfei Gao <zhangfei.gao@...il.com>,
        Sahitya Tummala <stummala@...eaurora.org>,
        Harjani Ritesh <riteshh@...eaurora.org>,
        Venu Byravarasu <vbyravarasu@...dia.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH V14 18/24] mmc: block: blk-mq: Separate card polling from recovery

Recovery is simpler to understand if it is only used for errors. Create a
separate function for card polling.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 drivers/mmc/core/block.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index b1857eee46fd..7eb55f2dffa9 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2162,6 +2162,24 @@ static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq)
 	       brq->data.error || brq->cmd.resp[0] & CMD_ERRORS;
 }
 
+static int mmc_blk_card_busy(struct mmc_card *card, struct request *req)
+{
+	struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
+	bool gen_err = false;
+	int err;
+
+	if (mmc_host_is_spi(card->host) || rq_data_dir(req) == READ)
+		return 0;
+
+	err = card_busy_detect_err(card, true, req, &gen_err);
+
+	/* Copy the general error bit so it will be seen later on */
+	if (gen_err)
+		mqrq->brq.stop.resp[0] |= R1_ERROR;
+
+	return err;
+}
+
 static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq,
 					    struct request *req)
 {
@@ -2218,8 +2236,15 @@ static void mmc_blk_mq_poll_completion(struct mmc_queue *mq,
 				       struct request *req)
 {
 	struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
+	struct mmc_host *host = mq->card->host;
 
-	mmc_blk_mq_rw_recovery(mq, req);
+	if (mmc_blk_rq_error(&mqrq->brq) ||
+	    mmc_blk_card_busy(mq->card, req)) {
+		mmc_blk_mq_rw_recovery(mq, req);
+	} else {
+		mmc_blk_rw_reset_success(mq, req);
+		mmc_retune_release(host);
+	}
 
 	mmc_blk_urgent_bkops(mq, mqrq);
 }
-- 
1.9.1