diff mbox series

[2/4] serial: qcom-geni: fix DMA mapping leak on shutdown

Message ID 20230307164405.14218-3-johan+linaro@kernel.org
State New
Headers
Series serial: qcom-geni: fix console shutdown hang |

Commit Message

Johan Hovold March 7, 2023, 4:44 p.m. UTC 
  Fix what appears to be a copy-paste error that can lead to a leaked DMA
mapping on close() and failure to restart TX after the port is reopened.

Note that rx_dma_addr is generally NULL when
qcom_geni_serial_stop_tx_dma() is called as part of shutdown() (but
tx_dma_addr need not be).

Fixes: 2aaa43c70778 ("tty: serial: qcom-geni-serial: add support for serial engine DMA")
Cc: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 drivers/tty/serial/qcom_geni_serial.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Doug Anderson March 7, 2023, 6:36 p.m. UTC | #1 
Hi,

On Tue, Mar 7, 2023 at 8:43 AM Johan Hovold <johan+linaro@kernel.org> wrote:
>
> Fix what appears to be a copy-paste error that can lead to a leaked DMA
> mapping on close() and failure to restart TX after the port is reopened.
>
> Note that rx_dma_addr is generally NULL when
> qcom_geni_serial_stop_tx_dma() is called as part of shutdown() (but
> tx_dma_addr need not be).
>
> Fixes: 2aaa43c70778 ("tty: serial: qcom-geni-serial: add support for serial engine DMA")
> Cc: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
> ---
>  drivers/tty/serial/qcom_geni_serial.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Douglas Anderson <dianders@chromium.org>
diff mbox series

Patch

diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index 11da05d8f848..2aa3872e6283 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -596,7 +596,7 @@  static void qcom_geni_serial_stop_tx_dma(struct uart_port *uport)
 	if (!qcom_geni_serial_main_active(uport))
 		return;
 
-	if (port->rx_dma_addr) {
+	if (port->tx_dma_addr) {
 		geni_se_tx_dma_unprep(&port->se, port->tx_dma_addr,
 				      port->tx_remaining);
 		port->tx_dma_addr = 0;