The mapped transmit buffer is never unmapped. This leaks quite some
mappings, as the mapping is done in uart_ops.startup(), i.e. every time
the device is opened. Unmap the buffer on device close.
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
v3:
- Rebased on top of "serial: sh-sci: Switch to dma_map_single() for
DMA transmission", and thus converted from scatterlist to buffer.
v2:
- Add TODO.
---
drivers/tty/serial/sh-sci.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 5a528b8985052017..4345aa422eed43a1 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1384,6 +1384,8 @@ static void sci_tx_dma_release(struct sci_port *s, bool enable_pio)
s->chan_tx = NULL;
s->cookie_tx = -EINVAL;
+ dma_unmap_single(chan->device->dev, s->tx_dma_addr, UART_XMIT_SIZE,
+ DMA_TO_DEVICE);
dma_release_channel(chan);
if (enable_pio)
sci_start_tx(port);
--
1.9.1
--
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