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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>
This commit is contained in:
Andy Shevchenko 2015-09-30 10:04:17 +03:00 committed by Greg Kroah-Hartman
parent 10791233e9
commit 27c310c5c3
1 changed files with 0 additions and 6 deletions
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6
drivers/tty/serial/8250/8250_dma.c
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@ -54,9 +54,6 @@ static void __dma_rx_complete(void *param)
struct dma_tx_state state;
int count;
dma_sync_single_for_cpu(dma->rxchan->device->dev, dma->rx_addr,
dma->rx_size, DMA_FROM_DEVICE);
dma->rx_running = 0;
dmaengine_tx_status(dma->rxchan, dma->rx_cookie, &state);
@ -156,9 +153,6 @@ int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir)
dma->rx_cookie = dmaengine_submit(desc);
dma_sync_single_for_device(dma->rxchan->device->dev, dma->rx_addr,
dma->rx_size, DMA_FROM_DEVICE);
dma_async_issue_pending(dma->rxchan);
return 0;