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1eebe72a80
Manually rebased: bcm27xx/patches-5.15/950-0600-xhci-quirks-add-link-TRB-quirk-for-VL805.patch bcm27xx/patches-5.15/950-0606-usb-xhci-add-VLI_TRB_CACHE_BUG-quirk.patch bcm27xx/patches-5.15/950-0717-usb-xhci-add-a-quirk-for-Superspeed-bulk-OUT-transfe.patch bcm53xx/patches-5.15/180-usb-xhci-add-support-for-performing-fake-doorbell.patch lantiq/patches-5.15/0028-NET-lantiq-various-etop-fixes.patch All other patches automatically rebased Build system: x86_64 Build-tested: bcm2711/RPi4B, mt7622/RT3200 Run-tested: bcm2711/RPi4B, mt7622/RT3200 Signed-off-by: John Audia <therealgraysky@proton.me>
39 lines
1.4 KiB
Diff
39 lines
1.4 KiB
Diff
From b70da899940777d92338d8f83f7a6236818ad08a 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
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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 | 6 +++++-
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1 file changed, 5 insertions(+), 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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@@ -1883,7 +1883,11 @@ 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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+ /*
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+ * XXX: don't do single-sector reads, as it leaks a SG DMA
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+ * mapping when reusing the still-pending req.
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+ */
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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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