[PATCH 5.4 35/80] mmc: block: fix read single on recovery logic

Greg Kroah-Hartman
2022-02-21T09:10:05Z

From: Christian Löhle <CLoehle@hyperstone.com>

commit 54309fde1a352ad2674ebba004a79f7d20b9f037 upstream.

On reads with MMC_READ_MULTIPLE_BLOCK that fail,
the recovery handler will use MMC_READ_SINGLE_BLOCK for
each of the blocks, up to MMC_READ_SINGLE_RETRIES times each.
The logic for this is fixed to never report unsuccessful reads
as success to the block layer.

On command error with retries remaining, blk_update_request was
called with whatever value error was set last to.
In case it was last set to BLK_STS_OK (default), the read will be
reported as success, even though there was no data read from the device.
This could happen on a CRC mismatch for the response,
a card rejecting the command (e.g. again due to a CRC mismatch).
In case it was last set to BLK_STS_IOERR, the error is reported correctly,
but no retries will be attempted.

Fixes: 81196976ed946c ("mmc: block: Add blk-mq support")
Cc: stable@vger.kernel.org
Signed-off-by: Christian Loehle <cloehle@hyperstone.com>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/bc706a6ab08c4fe2834ba0c05a804672@hyperstone.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/mmc/core/block.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)

--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1671,31 +1671,31 @@ static void mmc_blk_read_single(struct m
struct mmc_card *card = mq->card;
struct mmc_host *host = card->host;
blk_status_t error = BLK_STS_OK;
- int retries = 0;

do {
u32 status;
int err;
+ int retries = 0;

- mmc_blk_rw_rq_prep(mqrq, card, 1, mq);
+ while (retries++ <= MMC_READ_SINGLE_RETRIES) {
+ mmc_blk_rw_rq_prep(mqrq, card, 1, mq);

- mmc_wait_for_req(host, mrq);
+ mmc_wait_for_req(host, mrq);

- err = mmc_send_status(card, &status);
- if (err)
- goto error_exit;
-
- if (!mmc_host_is_spi(host) &&
- !mmc_blk_in_tran_state(status)) {
- err = mmc_blk_fix_state(card, req);
+ err = mmc_send_status(card, &status);
if (err)
goto error_exit;
- }

- if (mrq->cmd->error && retries++ < MMC_READ_SINGLE_RETRIES)
- continue;
+ if (!mmc_host_is_spi(host) &&
+ !mmc_blk_in_tran_state(status)) {
+ err = mmc_blk_fix_state(card, req);
+ if (err)
+ goto error_exit;
+ }

- retries = 0;
+ if (!mrq->cmd->error)
+ break;
+ }

if (mrq->cmd->error ||
mrq->data->error ||