pch_uart: Fix duplicate memory release issue

Add initialize variable to prevent duplicate free memory.

Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index e7d91d973d52f8e499da8869c3dc17f49b346b29..6e96304b7c8feb436d4c6dbeaac8037266c3c52a 100644 (file)
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -656,10 +656,13 @@ static void pch_free_dma(struct uart_port *port)
                dma_release_channel(priv->chan_rx);
                priv->chan_rx = NULL;
        }
-       if (sg_dma_address(&priv->sg_rx))
-               dma_free_coherent(port->dev, port->fifosize,
-                                 sg_virt(&priv->sg_rx),
-                                 sg_dma_address(&priv->sg_rx));
+
+       if (priv->rx_buf_dma) {
+               dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt,
+                                 priv->rx_buf_dma);
+               priv->rx_buf_virt = NULL;
+               priv->rx_buf_dma = 0;
+       }
 
        return;
 }