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serial: sh-sci: Fix TX buffer mapping leak

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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@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2015-08-21 20:02:43 +02:00 committed by Greg Kroah-Hartman
parent 79904420b7
commit 2e301474f1
1 changed files with 2 additions and 0 deletions
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2
drivers/tty/serial/sh-sci.c
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@ -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);