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Message-ID: <20220503225104.12108-7-Sergey.Semin@baikalelectronics.ru>
Date: Wed, 4 May 2022 01:50:44 +0300
From: Serge Semin <Sergey.Semin@...kalelectronics.ru>
To: Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
Vinod Koul <vkoul@...nel.org>,
Jingoo Han <jingoohan1@...il.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Frank Li <Frank.Li@....com>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
CC: Serge Semin <Sergey.Semin@...kalelectronics.ru>,
Serge Semin <fancer.lancer@...il.com>,
Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
Rob Herring <robh@...nel.org>,
Krzysztof WilczyĆski <kw@...ux.com>,
<linux-pci@...r.kernel.org>, <dmaengine@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>
Subject: [PATCH v2 06/26] dmaengine: dw-edma: Don't permit non-inc interleaved xfers
DW eDMA controller always increments both source and destination
addresses. Permitting DMA interleaved transfers with no src_inc/dst_inc
flags set may lead to unexpected behaviour for the device users. Let's fix
that by terminating the interleaved transfers if at least one of the
dma_interleaved_template.{src_inc,dst_inc} flag is initialized with false
value. Note in addition to that we need to increase the source and
destination addresses accordingly after each iteration.
Fixes: 85e7518f42c8 ("dmaengine: dw-edma: Add device_prep_interleave_dma() support")
Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
---
drivers/dma/dw-edma/dw-edma-core.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index f0ef87d75ea9..225eab58acb7 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -386,6 +386,8 @@ dw_edma_device_transfer(struct dw_edma_transfer *xfer)
return NULL;
if (xfer->xfer.il->numf > 0 && xfer->xfer.il->frame_size > 0)
return NULL;
+ if (!xfer->xfer.il->src_inc || !xfer->xfer.il->dst_inc)
+ return NULL;
} else {
return NULL;
}
@@ -485,15 +487,13 @@ dw_edma_device_transfer(struct dw_edma_transfer *xfer)
struct dma_interleaved_template *il = xfer->xfer.il;
struct data_chunk *dc = &il->sgl[i];
- if (il->src_sgl) {
- src_addr += burst->sz;
+ src_addr += burst->sz;
+ if (il->src_sgl)
src_addr += dmaengine_get_src_icg(il, dc);
- }
- if (il->dst_sgl) {
- dst_addr += burst->sz;
+ dst_addr += burst->sz;
+ if (il->dst_sgl)
dst_addr += dmaengine_get_dst_icg(il, dc);
- }
}
}
--
2.35.1
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