mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 17:18:59 +00:00
35 lines
1.3 KiB
Diff
35 lines
1.3 KiB
Diff
|
From 46b28bf91d411852abb18119c27d73da6064826d Mon Sep 17 00:00:00 2001
|
||
|
|
From: Jonathan Bell <jonathan@raspberrypi.com>
|
||
|
|
Date: Mon, 16 May 2022 10:28:27 +0100
|
||
|
|
Subject: [PATCH] mmc: block: Don't do single-sector reads during
|
||
|
|
recovery
|
||
|
|
|
||
|
|
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>
|
||
|
|
---
|
||
|
|
drivers/mmc/core/block.c | 2 +-
|
||
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
||
|
|
|
||
|
|
--- a/drivers/mmc/core/block.c
|
||
|
|
+++ b/drivers/mmc/core/block.c
|
||
|
|
@@ -1902,7 +1902,7 @@ static void mmc_blk_mq_rw_recovery(struc
|
||
|
|
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) {
|
||
|
|
/* Read one (native) sector at a time */
|
||
|
|
mmc_blk_read_single(mq, req);
|