While the .flush_buffer() callback clears sci_port.tx_dma_len since
commit 1cf4a7efdc71cab8 ("serial: sh-sci: Fix race condition causing
garbage during shutdown"), it does not terminate a transmit DMA
operation that may be in progress.
Fix this by terminating any pending DMA operations, and resetting the
corresponding cookie.
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
drivers/tty/serial/sh-sci.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index d4504daff99263f5..d18c680aa64b3427 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1656,11 +1656,18 @@ static void sci_free_dma(struct uart_port *port)
static void sci_flush_buffer(struct uart_port *port)
{
+ struct sci_port *s = to_sci_port(port);
+
/*
* In uart_flush_buffer(), the xmit circular buffer has just been
- * cleared, so we have to reset tx_dma_len accordingly.
+ * cleared, so we have to reset tx_dma_len accordingly, and stop any
+ * pending transfers
*/
- to_sci_port(port)->tx_dma_len = 0;
+ s->tx_dma_len = 0;
+ if (s->chan_tx) {
+ dmaengine_terminate_async(s->chan_tx);
+ s->cookie_tx = -EINVAL;
+ }
}
#else /* !CONFIG_SERIAL_SH_SCI_DMA */
static inline void sci_request_dma(struct uart_port *port)
--
2.17.1
