From 5e3dbfca3b14a4a2950255c1628cd53b384d963e Mon Sep 17 00:00:00 2001 From: Pradeep Goudagunta Date: Fri, 6 Jun 2014 16:48:08 +0530 Subject: [PATCH] serial: tegra: update tx_circular buffer only when TX_DMA is in progress When channel is require to stop transmit then update the Tx circular buffer only when DMA based transfer is in progress. If there is no DMA based transfer then no need to update the Tx buffer. Signed-off-by: Pradeep Goudagunta Signed-off-by: Laxman Dewangan Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/serial-tegra.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index d5c2a287b7e7..117d8d1382f9 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -482,6 +482,9 @@ static void tegra_uart_stop_tx(struct uart_port *u) struct dma_tx_state state; int count; + if (tup->tx_in_progress != TEGRA_UART_TX_DMA) + return; + dmaengine_terminate_all(tup->tx_dma_chan); dmaengine_tx_status(tup->tx_dma_chan, tup->tx_cookie, &state); count = tup->tx_bytes_requested - state.residue; -- 2.34.1