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dmaengine: xilinx: Fix race condition in axi dma cyclic dma mode

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In cyclic DMA mode need to link the tail bd segment
with the head bd segment to process bd's in cyclic.

Current driver is doing this only for tx channel
needs to update the same for rx channel case also.

This patch fixes the same.

Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Kedareswara rao Appana 2016-07-09 14:09:48 +05:30 committed by Vinod Koul
parent b0cc417c16
commit e598e6eb46
1 changed files with 5 additions and 4 deletions
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9
drivers/dma/xilinx/xilinx_dma.c
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@ -1895,14 +1895,15 @@ static struct dma_async_tx_descriptor *xilinx_dma_prep_dma_cyclic(
reg |= XILINX_DMA_CR_CYCLIC_BD_EN_MASK;
dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
/* For the last DMA_MEM_TO_DEV transfer, set EOP */
if (direction == DMA_MEM_TO_DEV) {
head_segment->hw.control |= XILINX_DMA_BD_SOP;
segment = list_last_entry(&desc->segments,
struct xilinx_axidma_tx_segment,
node);
segment->hw.control |= XILINX_DMA_BD_EOP;
segment->hw.next_desc = (u32) head_segment->phys;
/* For the last DMA_MEM_TO_DEV transfer, set EOP */
if (direction == DMA_MEM_TO_DEV) {
head_segment->hw.control |= XILINX_DMA_BD_SOP;
segment->hw.control |= XILINX_DMA_BD_EOP;
}
return &desc->async_tx;