linux-kernel - [PATCH v2 4/6] dmaengine: sprd: Fix block length overflow

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Message-Id: <8f9a1748488e9d890995c158375482285253cc46.1557127239.git.baolin.wang@linaro.org>
Date:   Mon,  6 May 2019 15:28:31 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     dan.j.williams@...el.com, vkoul@...nel.org
Cc:     eric.long@...soc.com, orsonzhai@...il.com, zhang.lyra@...il.com,
        vincent.guittot@...aro.org, baolin.wang@...aro.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/6] dmaengine: sprd: Fix block length overflow

From: Eric Long <eric.long@...soc.com>

The maximum value of block length is 0xffff, so if the configured transfer length
is more than 0xffff, that will cause block length overflow to lead a configuration
error.

Thus we can set block length as the maximum burst length to avoid this issue, since
the maximum burst length will not be a big value which is more than 0xffff.

Signed-off-by: Eric Long <eric.long@...soc.com>
Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/dma/sprd-dma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 0f92e60..a01c232 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -778,7 +778,7 @@ static int sprd_dma_fill_desc(struct dma_chan *chan,
 	temp |= slave_cfg->src_maxburst & SPRD_DMA_FRG_LEN_MASK;
 	hw->frg_len = temp;
 
-	hw->blk_len = len & SPRD_DMA_BLK_LEN_MASK;
+	hw->blk_len = slave_cfg->src_maxburst & SPRD_DMA_BLK_LEN_MASK;
 	hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK;
 
 	temp = (dst_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET;
-- 
1.7.9.5