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Subject[PATCH 06/10] dmaengine: dma-jz4780: Use vchan_terminate_vdesc() instead of desc_free
Date
To avoid race with vchan_complete, use the race free way to terminate
running transfer.

Implement the device_synchronize callback to make sure that the terminated
descriptor is freed.

CC: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
drivers/dma/dma-jz4780.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
index 7373b7a555ec..85820a2d69d4 100644
--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c
@@ -511,7 +511,7 @@ static int jz4780_dma_terminate_all(struct dma_chan *chan)
/* Clear the DMA status and stop the transfer. */
jz4780_dma_writel(jzdma, JZ_DMA_REG_DCS(jzchan->id), 0);
if (jzchan->desc) {
- jz4780_dma_desc_free(&jzchan->desc->vdesc);
+ vchan_terminate_vdesc(&jzchan->desc->vdesc);
jzchan->desc = NULL;
}

@@ -523,6 +523,13 @@ static int jz4780_dma_terminate_all(struct dma_chan *chan)
return 0;
}

+static void jz4780_dma_synchronize(struct dma_chan *chan)
+{
+ struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
+
+ vchan_synchronize(&jzchan->vchan);
+}
+
static int jz4780_dma_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
@@ -813,6 +820,7 @@ static int jz4780_dma_probe(struct platform_device *pdev)
dd->device_prep_dma_memcpy = jz4780_dma_prep_dma_memcpy;
dd->device_config = jz4780_dma_config;
dd->device_terminate_all = jz4780_dma_terminate_all;
+ dd->device_synchronize = jz4780_dma_synchronize;
dd->device_tx_status = jz4780_dma_tx_status;
dd->device_issue_pending = jz4780_dma_issue_pending;
dd->src_addr_widths = JZ_DMA_BUSWIDTHS;
--
Peter
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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