[Blackfin] serial driver: Fix bug Free rx dma buffer in shutdown.
Kernel crash for the serial driver in DMA mode: http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3679 Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
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@ -704,6 +704,7 @@ static void bfin_serial_shutdown(struct uart_port *port)
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disable_dma(uart->rx_dma_channel);
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free_dma(uart->rx_dma_channel);
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del_timer(&(uart->rx_dma_timer));
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dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
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#else
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#ifdef CONFIG_KGDB_UART
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if (uart->port.line != CONFIG_KGDB_UART_PORT)
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