This is a note to let you know that I've just added the patch titled
dmaengine: qcom-adm: fix wrong calling convention for prep_slave_sg
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dmaengine-qcom-adm-fix-wrong-calling-convention-for-prep_slave_sg.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b9d2140c3badf4107973ad77c5a0ec3075705c85 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@xxxxxxxxx>
Date: Fri, 16 Sep 2022 06:12:56 +0200
Subject: dmaengine: qcom-adm: fix wrong calling convention for prep_slave_sg
From: Christian Marangi <ansuelsmth@xxxxxxxxx>
commit b9d2140c3badf4107973ad77c5a0ec3075705c85 upstream.
The calling convention for pre_slave_sg is to return NULL on error and
provide an error log to the system. Qcom-adm instead provide error
pointer when an error occur. This indirectly cause kernel panic for
example for the nandc driver that checks only if the pointer returned by
device_prep_slave_sg is not NULL. Returning an error pointer makes nandc
think the device_prep_slave_sg function correctly completed and makes
the kernel panics later in the code.
While nandc is the one that makes the kernel crash, it was pointed out
that the real problem is qcom-adm not following calling convention for
that function.
To fix this, drop returning error pointer and return NULL with an error
log.
Fixes: 03de6b273805 ("dmaengine: qcom-adm: stop abusing slave_id config")
Fixes: 5c9f8c2dbdbe ("dmaengine: qcom: Add ADM driver")
Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v5.11+
Link: https://lore.kernel.org/r/20220916041256.7104-1-ansuelsmth@xxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dma/qcom/qcom_adm.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
--- a/drivers/dma/qcom/qcom_adm.c
+++ b/drivers/dma/qcom/qcom_adm.c
@@ -379,13 +379,13 @@ static struct dma_async_tx_descriptor *a
if (blk_size < 0) {
dev_err(adev->dev, "invalid burst value: %d\n",
burst);
- return ERR_PTR(-EINVAL);
+ return NULL;
}
crci = achan->crci & 0xf;
if (!crci || achan->crci > 0x1f) {
dev_err(adev->dev, "invalid crci value\n");
- return ERR_PTR(-EINVAL);
+ return NULL;
}
}
@@ -403,8 +403,10 @@ static struct dma_async_tx_descriptor *a
}
async_desc = kzalloc(sizeof(*async_desc), GFP_NOWAIT);
- if (!async_desc)
- return ERR_PTR(-ENOMEM);
+ if (!async_desc) {
+ dev_err(adev->dev, "not enough memory for async_desc struct\n");
+ return NULL;
+ }
async_desc->mux = achan->mux ? ADM_CRCI_CTL_MUX_SEL : 0;
async_desc->crci = crci;
@@ -414,8 +416,10 @@ static struct dma_async_tx_descriptor *a
sizeof(*cple) + 2 * ADM_DESC_ALIGN;
async_desc->cpl = kzalloc(async_desc->dma_len, GFP_NOWAIT);
- if (!async_desc->cpl)
+ if (!async_desc->cpl) {
+ dev_err(adev->dev, "not enough memory for cpl struct\n");
goto free;
+ }
async_desc->adev = adev;
@@ -437,8 +441,10 @@ static struct dma_async_tx_descriptor *a
async_desc->dma_addr = dma_map_single(adev->dev, async_desc->cpl,
async_desc->dma_len,
DMA_TO_DEVICE);
- if (dma_mapping_error(adev->dev, async_desc->dma_addr))
+ if (dma_mapping_error(adev->dev, async_desc->dma_addr)) {
+ dev_err(adev->dev, "dma mapping error for cpl\n");
goto free;
+ }
cple_addr = async_desc->dma_addr + ((void *)cple - async_desc->cpl);
@@ -454,7 +460,7 @@ static struct dma_async_tx_descriptor *a
free:
kfree(async_desc);
- return ERR_PTR(-ENOMEM);
+ return NULL;
}
/**
Patches currently in stable-queue which might be from ansuelsmth@xxxxxxxxx are
queue-6.0/dmaengine-qcom-adm-fix-wrong-sizeof-config-in-slave_config.patch
queue-6.0/dmaengine-qcom-adm-fix-wrong-calling-convention-for-prep_slave_sg.patch
