From: Andy Shevchenko Date: Wed, 30 Sep 2015 07:04:17 +0000 (+0300) Subject: serial: 8250_dma: no need to sync RX buffer X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=27c310c5c312;p=linux-beck.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c index 21d01a491405..b50307129901 100644 --- a/drivers/tty/serial/8250/8250_dma.c +++ b/drivers/tty/serial/8250/8250_dma.c @@ -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;