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33 lines
1.3 KiB
Diff
33 lines
1.3 KiB
Diff
From 868357c3e554378ff86d1cf2438bfea5e2d95c94 Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.com>
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Date: Mon, 16 May 2022 10:28:27 +0100
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Subject: [PATCH] mmc: block: Don't do single-sector reads during recovery
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See https://github.com/raspberrypi/linux/issues/5019
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If an SD card has degraded performance such that IO operations time out
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then the MMC block layer will leak SG DMA mappings in the swiotlb during
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recovery. It retries the same SG and this causes the leak, as it is
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mapped twice - once in sdhci_pre_req() and again during single-block
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reads in sdhci_prepare_data().
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Resetting the card (including power-cycling if a regulator for vmmc is
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present) ought to be enough to recover a stuck state, so for now don't
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try single-block reads in the recovery path.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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drivers/mmc/core/block.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/mmc/core/block.c
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+++ b/drivers/mmc/core/block.c
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@@ -1926,7 +1926,7 @@ static void mmc_blk_mq_rw_recovery(struc
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return;
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}
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- if (rq_data_dir(req) == READ && brq->data.blocks >
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+ if (0 && rq_data_dir(req) == READ && brq->data.blocks >
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queue_physical_block_size(mq->queue) >> 9) {
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/* Read one (native) sector at a time */
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mmc_blk_read_single(mq, req);
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