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 e7d91d9..6e96304 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -656,10 +656,13 @@
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;
}