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Subject[PATCH v3 06/12] mmc: move error code in mmc_block_issue_rw_rq to a separate function.
Date
Break out code without functional changes. This simplifies the code and
makes way for handle two parallel request.

Signed-off-by: Per Forlin <per.forlin@linaro.org>
---
drivers/mmc/card/block.c | 225 +++++++++++++++++++++++++++-------------------
1 files changed, 132 insertions(+), 93 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index e606dec..9444243 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -79,6 +79,13 @@ struct mmc_blk_data {

static DEFINE_MUTEX(open_lock);

+enum mmc_blk_status {
+ MMC_BLK_SUCCESS = 0,
+ MMC_BLK_RETRY,
+ MMC_BLK_DATA_ERR,
+ MMC_BLK_CMD_ERR,
+};
+
module_param(perdev_minors, int, 0444);
MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");

@@ -413,116 +420,148 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
mmc_queue_bounce_pre(mqrq);
}

+static enum mmc_blk_status mmc_blk_get_status(struct mmc_blk_request *brq,
+ struct request *req,
+ struct mmc_card *card,
+ struct mmc_blk_data *md)
+{
+ struct mmc_command cmd;
+ u32 status = 0;
+ enum mmc_blk_status ret = MMC_BLK_SUCCESS;
+
+ /*
+ * Check for errors here, but don't jump to cmd_err
+ * until later as we need to wait for the card to leave
+ * programming mode even when things go wrong.
+ */
+ if (brq->cmd.error || brq->data.error || brq->stop.error) {
+ if (brq->data.blocks > 1 && rq_data_dir(req) == READ) {
+ /* Redo read one sector at a time */
+ printk(KERN_WARNING "%s: retrying using single "
+ "block read, brq %p\n",
+ req->rq_disk->disk_name, brq);
+ ret = MMC_BLK_RETRY;
+ goto out;
+ }
+ status = get_card_status(card, req);
+ }
+
+ if (brq->cmd.error) {
+ printk(KERN_ERR "%s: error %d sending read/write "
+ "command, response %#x, card status %#x\n",
+ req->rq_disk->disk_name, brq->cmd.error,
+ brq->cmd.resp[0], status);
+ }
+
+ if (brq->data.error) {
+ if (brq->data.error == -ETIMEDOUT && brq->mrq.stop)
+ /* 'Stop' response contains card status */
+ status = brq->mrq.stop->resp[0];
+ printk(KERN_ERR "%s: error %d transferring data,"
+ " sector %u, nr %u, card status %#x\n",
+ req->rq_disk->disk_name, brq->data.error,
+ (unsigned)blk_rq_pos(req),
+ (unsigned)blk_rq_sectors(req), status);
+ }
+
+ if (brq->stop.error) {
+ printk(KERN_ERR "%s: error %d sending stop command, "
+ "response %#x, card status %#x\n",
+ req->rq_disk->disk_name, brq->stop.error,
+ brq->stop.resp[0], status);
+ }
+
+ if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
+ do {
+ int err;
+
+ cmd.opcode = MMC_SEND_STATUS;
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+ err = mmc_wait_for_cmd(card->host, &cmd, 5);
+ if (err) {
+ printk(KERN_ERR "%s: error %d requesting status\n",
+ req->rq_disk->disk_name, err);
+ ret = MMC_BLK_CMD_ERR;
+ goto out;
+ }
+ /*
+ * Some cards mishandle the status bits,
+ * so make sure to check both the busy
+ * indication and the card state.
+ */
+ } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
+ (R1_CURRENT_STATE(cmd.resp[0]) == 7));
+
+#if 0
+ if (cmd.resp[0] & ~0x00000900)
+ printk(KERN_ERR "%s: status = %08x\n",
+ req->rq_disk->disk_name, cmd.resp[0]);
+ if (mmc_decode_status(cmd.resp)) {
+ ret = MMC_BLK_CMD_ERR;
+ goto out;
+ }
+
+#endif
+ }
+
+ if (brq->cmd.error || brq->stop.error || brq->data.error) {
+ if (rq_data_dir(req) == READ)
+ ret = MMC_BLK_DATA_ERR;
+ else
+ ret = MMC_BLK_CMD_ERR;
+ }
+ out:
+ return ret;
+
+}
+
static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
{
struct mmc_blk_data *md = mq->data;
struct mmc_card *card = md->queue.card;
struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
int ret = 1, disable_multi = 0;
+ enum mmc_blk_status status;

mmc_claim_host(card->host);

do {
- struct mmc_command cmd;
- u32 status = 0;
-
mmc_blk_rw_rq_prep(mq->mqrq_cur, card, disable_multi, mq);
mmc_wait_for_req(card->host, &brq->mrq);

mmc_queue_bounce_post(mq->mqrq_cur);
+ status = mmc_blk_get_status(brq, req, card, md);

- /*
- * Check for errors here, but don't jump to cmd_err
- * until later as we need to wait for the card to leave
- * programming mode even when things go wrong.
- */
- if (brq->cmd.error || brq->data.error || brq->stop.error) {
- if (brq->data.blocks > 1 && rq_data_dir(req) == READ) {
- /* Redo read one sector at a time */
- printk(KERN_WARNING "%s: retrying using single "
- "block read\n", req->rq_disk->disk_name);
- disable_multi = 1;
- continue;
- }
- status = get_card_status(card, req);
- }
-
- if (brq->cmd.error) {
- printk(KERN_ERR "%s: error %d sending read/write "
- "command, response %#x, card status %#x\n",
- req->rq_disk->disk_name, brq->cmd.error,
- brq->cmd.resp[0], status);
- }
-
- if (brq->data.error) {
- if (brq->data.error == -ETIMEDOUT && brq->mrq.stop)
- /* 'Stop' response contains card status */
- status = brq->mrq.stop->resp[0];
- printk(KERN_ERR "%s: error %d transferring data,"
- " sector %u, nr %u, card status %#x\n",
- req->rq_disk->disk_name, brq->data.error,
- (unsigned)blk_rq_pos(req),
- (unsigned)blk_rq_sectors(req), status);
- }
-
- if (brq->stop.error) {
- printk(KERN_ERR "%s: error %d sending stop command, "
- "response %#x, card status %#x\n",
- req->rq_disk->disk_name, brq->stop.error,
- brq->stop.resp[0], status);
- }
-
- if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
- do {
- int err;
-
- cmd.opcode = MMC_SEND_STATUS;
- cmd.arg = card->rca << 16;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
- err = mmc_wait_for_cmd(card->host, &cmd, 5);
- if (err) {
- printk(KERN_ERR "%s: error %d requesting status\n",
- req->rq_disk->disk_name, err);
- goto cmd_err;
- }
- /*
- * Some cards mishandle the status bits,
- * so make sure to check both the busy
- * indication and the card state.
- */
- } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
- (R1_CURRENT_STATE(cmd.resp[0]) == 7));
-
-#if 0
- if (cmd.resp[0] & ~0x00000900)
- printk(KERN_ERR "%s: status = %08x\n",
- req->rq_disk->disk_name, cmd.resp[0]);
- if (mmc_decode_status(cmd.resp))
- goto cmd_err;
-#endif
- }
-
- if (brq->cmd.error || brq->stop.error || brq->data.error) {
- if (rq_data_dir(req) == READ) {
- /*
- * After an error, we redo I/O one sector at a
- * time, so we only reach here after trying to
- * read a single sector.
- */
- spin_lock_irq(&md->lock);
- ret = __blk_end_request(req, -EIO, brq->data.blksz);
- spin_unlock_irq(&md->lock);
- continue;
- }
+ switch (status) {
+ case MMC_BLK_CMD_ERR:
goto cmd_err;
- }
+ break;
+ case MMC_BLK_RETRY:
+ disable_multi = 1;
+ ret = 1;
+ break;
+ case MMC_BLK_DATA_ERR:
+ /*
+ * After an error, we redo I/O one sector at a
+ * time, so we only reach here after trying to
+ * read a single sector.
+ */
+ spin_lock_irq(&md->lock);
+ ret = __blk_end_request(req, -EIO,
+ brq->data.blksz);
+ spin_unlock_irq(&md->lock);

- /*
- * A block was successfully transferred.
- */
- spin_lock_irq(&md->lock);
- ret = __blk_end_request(req, 0, brq->data.bytes_xfered);
- spin_unlock_irq(&md->lock);
+ break;
+ case MMC_BLK_SUCCESS:
+ /*
+ * A block was successfully transferred.
+ */
+ spin_lock_irq(&md->lock);
+ ret = __blk_end_request(req, 0, brq->data.bytes_xfered);
+ spin_unlock_irq(&md->lock);
+ break;
+ }
} while (ret);

mmc_release_host(card->host);
--
1.7.4.1


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