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mmc: block: Add error-handling comments 

Add error-handling comments to explain what would also be done for blk-mq
if it used the legacy error-handling.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Adrian Hunter 2017-11-29 15:41:01 +02:00 committed by Ulf Hansson
parent afab1bb8b4
commit 6d3898a6a5
1 changed files with 35 additions and 1 deletions
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36
drivers/mmc/core/block.c
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@ -1911,7 +1911,11 @@ static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
case MMC_BLK_SUCCESS:
case MMC_BLK_PARTIAL:
/*
* A block was successfully transferred.
* Reset success, and accept bytes_xfered. For
* MMC_BLK_PARTIAL re-submit the remaining request. For
* MMC_BLK_SUCCESS error out the remaining request (it
* could not be re-submitted anyway if a next request
* had already begun).
*/
mmc_blk_reset_success(md, type);
@ -1931,6 +1935,14 @@ static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
}
break;
case MMC_BLK_CMD_ERR:
/*
* For SD cards, get bytes written, but do not accept
* bytes_xfered if that fails. For MMC cards accept
* bytes_xfered. Then try to reset. If reset fails then
* error out the remaining request, otherwise retry
* once (N.B mmc_blk_reset() will not succeed twice in a
* row).
*/
req_pending = mmc_blk_rw_cmd_err(md, card, brq, old_req, req_pending);
if (mmc_blk_reset(md, card->host, type)) {
if (req_pending)
@ -1947,11 +1959,20 @@ static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
}
break;
case MMC_BLK_RETRY:
/*
* Do not accept bytes_xfered, but retry up to 5 times,
* otherwise same as abort.
*/
retune_retry_done = brq->retune_retry_done;
if (retry++ < 5)
break;
/* Fall through */
case MMC_BLK_ABORT:
/*
* Do not accept bytes_xfered, but try to reset. If
* reset succeeds, try once more, otherwise error out
* the request.
*/
if (!mmc_blk_reset(md, card->host, type))
break;
mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
@ -1960,6 +1981,13 @@ static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
case MMC_BLK_DATA_ERR: {
int err;
/*
* Do not accept bytes_xfered, but try to reset. If
* reset succeeds, try once more. If reset fails with
* ENODEV which means the partition is wrong, then error
* out the request. Otherwise attempt to read one sector
* at a time.
*/
err = mmc_blk_reset(md, card->host, type);
if (!err)
break;
@ -1971,6 +1999,10 @@ static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
/* Fall through */
}
case MMC_BLK_ECC_ERR:
/*
* Do not accept bytes_xfered. If reading more than one
* sector, try reading one sector at a time.
*/
if (brq->data.blocks > 1) {
/* Redo read one sector at a time */
pr_warn("%s: retrying using single block read\n",
@ -1992,10 +2024,12 @@ static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
}
break;
case MMC_BLK_NOMEDIUM:
/* Do not accept bytes_xfered. Error out the request */
mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
return;
default:
/* Do not accept bytes_xfered. Error out the request */
pr_err("%s: Unhandled return value (%d)",
old_req->rq_disk->disk_name, status);
mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);