| Message ID | bc706a6ab08c4fe2834ba0c05a804672@hyperstone.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [PATCHv2] mmc: block: fix read single on recovery logic | expand |
On 04/02/2022 17:11, Christian Löhle wrote: > 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> > --- > v2: > - Do not allow data error retries > - Actually retry MMC_READ_SINGLE_RETRIES times instead of > MMC_READ_SINGLE_RETRIES-1 > > > drivers/mmc/core/block.c | 28 ++++++++++++++-------------- > 1 file changed, 14 insertions(+), 14 deletions(-) > > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c > index 4e61b28a002f..8d718aa56d33 100644 > --- a/drivers/mmc/core/block.c > +++ b/drivers/mmc/core/block.c > @@ -1682,31 +1682,31 @@ static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req) > 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_ready_for_data(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_ready_for_data(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 || >
On Tue, 8 Feb 2022 at 07:37, Adrian Hunter <adrian.hunter@intel.com> wrote: > > On 04/02/2022 17:11, Christian Löhle wrote: > > 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> Applied for fixes, thanks to both of you! Kind regards Uffe > > > --- > > v2: > > - Do not allow data error retries > > - Actually retry MMC_READ_SINGLE_RETRIES times instead of > > MMC_READ_SINGLE_RETRIES-1 > > > > > > drivers/mmc/core/block.c | 28 ++++++++++++++-------------- > > 1 file changed, 14 insertions(+), 14 deletions(-) > > > > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c > > index 4e61b28a002f..8d718aa56d33 100644 > > --- a/drivers/mmc/core/block.c > > +++ b/drivers/mmc/core/block.c > > @@ -1682,31 +1682,31 @@ static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req) > > 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_ready_for_data(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_ready_for_data(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 || > > >
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 4e61b28a002f..8d718aa56d33 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -1682,31 +1682,31 @@ static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req) 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_ready_for_data(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_ready_for_data(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 ||
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> --- v2: - Do not allow data error retries - Actually retry MMC_READ_SINGLE_RETRIES times instead of MMC_READ_SINGLE_RETRIES-1 drivers/mmc/core/block.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-)