diff options
| author |   Chris Boot <bootc@bootc.net> | 2018-10-08 17:07:30 +0200 |
|---|---|---|
| committer |   Ulf Hansson <ulf.hansson@linaro.org> | 2018-10-09 09:23:00 +0200 |
| commit | 41591b38f5f8f78344954b68582b5f00e56ffe61 (patch) | |
| tree | 78a25d39a5515767dea363d066aafc0ee459f1f8 /drivers/mmc | |
| parent | Linux 4.19-rc7 (diff) | |
| download | linux-dev-41591b38f5f8f78344954b68582b5f00e56ffe61.tar.xz linux-dev-41591b38f5f8f78344954b68582b5f00e56ffe61.zip | |
mmc: block: avoid multiblock reads for the last sector in SPI mode
On some SD cards over SPI, reading with the multiblock read command the last
sector will leave the card in a bad state.
Remove last sectors from the multiblock reading cmd.
Signed-off-by: Chris Boot <bootc@bootc.net>
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/core/block.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index a0b9102c4c6e..e201ccb3fda4 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -1371,6 +1371,16 @@ static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq, if (brq->data.blocks > 1) { /* + * Some SD cards in SPI mode return a CRC error or even lock up + * completely when trying to read the last block using a + * multiblock read command. + */ + if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) && + (blk_rq_pos(req) + blk_rq_sectors(req) == + get_capacity(md->disk))) + brq->data.blocks--; + + /* * After a read error, we redo the request one sector * at a time in order to accurately determine which * sectors can be read successfully. |