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serial: imx: always wake up the processes in the TX callback
The current code only wakes up the processes when the circle buffer has less data then the WAKEUP_CHARS. But sometimes, the circle buffer may has data more then the WAKEUP_CHARS, in such case, the processes will hang. This patch makes it always wakes up the processes in the TX callback. Signed-off-by: Huang Shijie <b32955@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -496,8 +496,7 @@ static void dma_tx_callback(void *data)
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dev_dbg(sport->port.dev, "we finish the TX DMA.\n");
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(&sport->port);
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uart_write_wakeup(&sport->port);
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if (waitqueue_active(&sport->dma_wait)) {
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wake_up(&sport->dma_wait);
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