tty: serial: fsl_lpuart: terminate DMA on buffer flush

On uart buffer flush, serial core resets the circular buffer.
If a DMA transfer is in progress at that time, the callback
lpuart_dma_tx_complete will move buffer's tail unconditionally,
hence tail moves beyond head. Use the flush_buffer hook to
terminate the DMA imeaditely and avoid lpuart_dma_tx_complete
being called in this situation.

This bug often showed up while shutdown and lead to duplicate
serial console output.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index f196a33..b1893f3 100644 (file)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -455,6 +455,15 @@ static int lpuart_dma_rx(struct lpuart_port *sport)
        return 0;
 }
 
+static void lpuart_flush_buffer(struct uart_port *port)
+{
+       struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+       if (sport->lpuart_dma_tx_use) {
+               dmaengine_terminate_all(sport->dma_tx_chan);
+               sport->dma_tx_in_progress = 0;
+       }
+}
+
 static void lpuart_dma_rx_complete(void *arg)
 {
        struct lpuart_port *sport = arg;
@@ -1496,6 +1505,7 @@ static struct uart_ops lpuart_pops = {
        .release_port   = lpuart_release_port,
        .config_port    = lpuart_config_port,
        .verify_port    = lpuart_verify_port,
+       .flush_buffer   = lpuart_flush_buffer,
 };
 
 static struct uart_ops lpuart32_pops = {
@@ -1514,6 +1524,7 @@ static struct uart_ops lpuart32_pops = {
        .release_port   = lpuart_release_port,
        .config_port    = lpuart_config_port,
        .verify_port    = lpuart_verify_port,
+       .flush_buffer   = lpuart_flush_buffer,
 };
 
 static struct lpuart_port *lpuart_ports[UART_NR];