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serial: imx: change the wait even to interruptiable 

The wait_event() makes the application hang for ever in the following case:
 [1] the hardware flow control is enabled.
 [2] the other end (or the remote end) is terminated, and the TX is still
     waiting for the hardware flow control signal to become asserted.

This patch fixes it by changing the wait_event to wait_event_interruptible.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huang Shijie 2014-09-19 15:42:57 +08:00 committed by Greg Kroah-Hartman
parent 45564a6656
commit a4688bcd34
1 changed files with 10 additions and 1 deletions
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11
drivers/tty/serial/imx.c
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@ -1219,9 +1219,18 @@ static void imx_shutdown(struct uart_port *port)
unsigned long flags;
if (sport->dma_is_enabled) {
int ret;
/* We have to wait for the DMA to finish. */
wait_event(sport->dma_wait,
ret = wait_event_interruptible(sport->dma_wait,
!sport->dma_is_rxing && !sport->dma_is_txing);
if (ret != 0) {
sport->dma_is_rxing = 0;
sport->dma_is_txing = 0;
dmaengine_terminate_all(sport->dma_chan_tx);
dmaengine_terminate_all(sport->dma_chan_rx);
}
imx_stop_tx(port);
imx_stop_rx(port);
imx_disable_dma(sport);
imx_uart_dma_exit(sport);