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mmc: block: Don't do single-sector reads during recovery

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See https://github.com/raspberrypi/linux/issues/5019

If an SD card has degraded performance such that IO operations time out
then the MMC block layer will leak SG DMA mappings in the swiotlb during
recovery. It retries the same SG and this causes the leak, as it is
mapped twice - once in sdhci_pre_req() and again during single-block
reads in sdhci_prepare_data().

Resetting the card (including power-cycling if a regulator for vmmc is
present) ought to be enough to recover a stuck state, so for now don't
try single-block reads in the recovery path.

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
This commit is contained in:
Jonathan Bell
2022-05-16 10:28:27 +01:00
committed by Dom Cobley
parent be587b3f24
commit 214539ef02
1 changed files with 1 additions and 1 deletions
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2
drivers/mmc/core/block.c
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@@ -1949,7 +1949,7 @@ static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
return; return;
} }
if (rq_data_dir(req) == READ && brq->data.blocks > if (0 && rq_data_dir(req) == READ && brq->data.blocks >
queue_physical_block_size(mq->queue) >> 9) { queue_physical_block_size(mq->queue) >> 9) {
/* Read one (native) sector at a time */ /* Read one (native) sector at a time */
mmc_blk_read_single(mq, req); mmc_blk_read_single(mq, req);