linux-kernel - [PATCH 1/3] dmaengine: xilinx: xdma: Fix wrong offsets in the buffers addresses in dma descriptor

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Date: Wed, 27 Mar 2024 10:58:48 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Lizhi Hou <lizhi.hou@....com>, Brian Xu <brian.xu@....com>, 
 Raj Kumar Rampelli <raj.kumar.rampelli@....com>, 
 Vinod Koul <vkoul@...nel.org>, Michal Simek <michal.simek@....com>, 
 Jan Kuliga <jankul@...tek.krakow.pl>, 
 Miquel Raynal <miquel.raynal@...tlin.com>
Cc: dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
 Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH 1/3] dmaengine: xilinx: xdma: Fix wrong offsets in the
 buffers addresses in dma descriptor

From: Miquel Raynal <miquel.raynal@...tlin.com>

The addition of interleaved transfers slightly changed the way
addresses inside DMA descriptors are derived, breaking cyclic
transfers.

Fixes: 3e184e64c2e5 ("dmaengine: xilinx: xdma: Prepare the introduction of interleaved DMA transfers")
Cc: stable@...r.kernel.org
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/dma/xilinx/xdma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/xilinx/xdma.c b/drivers/dma/xilinx/xdma.c
index 170017ff2aad..b9788aa8f6b7 100644
--- a/drivers/dma/xilinx/xdma.c
+++ b/drivers/dma/xilinx/xdma.c
@@ -704,7 +704,7 @@ xdma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t address,
 	desc_num = 0;
 	for (i = 0; i < periods; i++) {
 		desc_num += xdma_fill_descs(sw_desc, *src, *dst, period_size, desc_num);
-		addr += i * period_size;
+		addr += period_size;
 	}
 
 	tx_desc = vchan_tx_prep(&xdma_chan->vchan, &sw_desc->vdesc, flags);

-- 
2.43.0