From ed183ee689058775b24021272c3a01d356fe8e2e Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Sat, 9 Apr 2016 22:14:34 -0700 Subject: [PATCH] serial: omap8250: Drop rx buffer sync commit 27c310c5c312 ("serial: 8250_dma: no need to sync RX buffer") notes the RX DMA buffer is allocated from DMA coherent memory, and thus does not need sync'd for each transaction. The same is true for OMAP RX DMA. Signed-off-by: Peter Hurley Reviewed-by: Heikki Krogerus Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_omap.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index abeaf5e..ca2a850 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -754,9 +754,6 @@ static void __dma_rx_do_complete(struct uart_8250_port *p, bool error) unsigned long flags; int ret; - dma_sync_single_for_cpu(dma->rxchan->device->dev, dma->rx_addr, - dma->rx_size, DMA_FROM_DEVICE); - spin_lock_irqsave(&priv->rx_dma_lock, flags); if (!dma->rx_running) @@ -868,9 +865,6 @@ static int omap_8250_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); out: spin_unlock_irqrestore(&priv->rx_dma_lock, flags); -- 2.7.4