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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>
This commit is contained in:
Huang Shijie 2014-01-22 16:23:37 +08:00 committed by Greg Kroah-Hartman
parent c972d806fd
commit 2ad28e3efe
1 changed files with 1 additions and 2 deletions
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3
drivers/tty/serial/imx.c
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@ -496,8 +496,7 @@ static void dma_tx_callback(void *data)
dev_dbg(sport->port.dev, "we finish the TX DMA.\n");
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
uart_write_wakeup(&sport->port);
if (waitqueue_active(&sport->dma_wait)) {
wake_up(&sport->dma_wait);