[PATCH] serial: tegra: read DMA status before terminating
From: Kartik <hidden>
Date: 2022-10-18 06:25:45
Also in:
linux-tegra, lkml
Subsystem:
tegra serial driver, the rest, tty layer and serial drivers · Maintainers:
Laxman Dewangan, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
To get the valid data, read DMA status before terminating the DMA. As
dmaengine_terminate_all() deletes the DMA desc.
Fixes: e9ea096dd225 ("serial: tegra: add serial driver")
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Signed-off-by: Kartik <redacted>
---
drivers/tty/serial/serial-tegra.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index b7170cb9a544..2779b4491f02 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c@@ -619,8 +619,8 @@ static void tegra_uart_stop_tx(struct uart_port *u) 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); + dmaengine_terminate_all(tup->tx_dma_chan); count = tup->tx_bytes_requested - state.residue; async_tx_ack(tup->tx_dma_desc); uart_xmit_advance(&tup->uport, count);
@@ -763,8 +763,8 @@ static void tegra_uart_terminate_rx_dma(struct tegra_uart_port *tup) return; } - dmaengine_terminate_all(tup->rx_dma_chan); dmaengine_tx_status(tup->rx_dma_chan, tup->rx_cookie, &state); + dmaengine_terminate_all(tup->rx_dma_chan); tegra_uart_rx_buffer_push(tup, state.residue); tup->rx_dma_active = false;
--
2.17.1