Commit d9211a3e authored Oct 09, 2018 by Maria Yu Committed by Tengfei Fan Nov 13, 2018

tty: serial: msm: Avoid to start tx when port suspended



No need to start uart tx when the port is suspended.
Also there is a race condition during system suspend process
and flush_to_ldisc work. When uart port suspended, it
will disable clocks and if the flush_to_ldisc work try to
do a uart start tx it will cause a noc error.

Change-Id: Ia1327837de03fc1bf827b891f8a0fc4b1bfdcfec
Signed-off-by: Maria Yu <aiquny@codeaurora.org>
Signed-off-by: Tengfei Fan <tengfeif@codeaurora.org>

parent 2fbf73da

drivers/tty/serial/msm_serial.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -428,6 +428,12 @@ static void msm_start_tx(struct uart_port *port)
		struct msm_port *msm_port = UART_TO_MSM(port);
		struct msm_dma *dma = &msm_port->tx_dma;

		/* No need to start tx when system suspended. */
		if (port->suspended) {
		printk_deferred("port suspended!\n");
		return;
		}

		/* Already started in DMA mode */
		if (dma->count)
		return;