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Commit 2ad28e3e authored by Huang Shijie's avatar Huang Shijie Committed by Greg Kroah-Hartman
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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: default avatarHuang Shijie <b32955@freescale.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c972d806

drivers/tty/serial/imx.c

+1 −2
Original line number Diff line number Diff line
@@ -496,7 +496,6 @@ 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);



	if (waitqueue_active(&sport->dma_wait)) {