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Commit ed183ee6 authored by Peter Hurley's avatar Peter Hurley Committed by Greg Kroah-Hartman
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serial: omap8250: Drop rx buffer sync 



commit 27c310c5 ("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: default avatarPeter Hurley <peter@hurleysoftware.com>
Reviewed-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ddedfd82

drivers/tty/serial/8250/8250_omap.c

+0 −6
Original line number Diff line number Diff line
@@ -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);