serial: 8250_dma: no need to sync RX buffer
RX buffer is allocated from DMA coherent memory. Thus there is no need to call DMA sync API for it. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -54,9 +54,6 @@ static void __dma_rx_complete(void *param)
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struct dma_tx_state state;
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int count;
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dma_sync_single_for_cpu(dma->rxchan->device->dev, dma->rx_addr,
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dma->rx_size, DMA_FROM_DEVICE);
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dma->rx_running = 0;
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dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state);
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@ -156,9 +153,6 @@ int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
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dma->rx_cookie = dmaengine_submit(desc);
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dma_sync_single_for_device(dma->rxchan->device->dev, dma->rx_addr,
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dma->rx_size, DMA_FROM_DEVICE);
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dma_async_issue_pending(dma->rxchan);
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return 0;
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