Commit b36b5f07 authored Jan 23, 2014 by Dilip Kota Committed by Gerrit - the friendly Code Review server Jan 31, 2014

msm_serial_hs: Initialize tty_flush_recieve while Port Open



Initialize the tty_flush_recieve to default value during
Port Open to avoid a corner case where Tx bytes may get queued
twice by UART in the absence of initialization.

Corner Case:
UART client calls uart_flush_buffer() API to flush the
data on Tx while UART Tx is in middle of operation.
If client immediately calls UART Port close followed by UART Tx
after Port-Open, it may result in queueing same bytes twice

CRs-Fixed: 590459
Change-Id: Ied9d33265060e1fde7fc98e29f58d3eff6ddc3c4
Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>

parent 62bf7693

drivers/tty/serial/msm_serial_hs.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2643,6 +2643,8 @@ static int msm_hs_startup(struct uart_port *uport)
		/* Initialize the tx */
		tx->tx_ready_int_en = 0;
		tx->dma_in_flight = 0;
		msm_uport->tty_flush_receive = false;
		MSM_HS_DBG("%s: Setting tty_flush_receive to false\n", __func__);

		if (!is_blsp_uart(msm_uport)) {
		tx->xfer.complete_func = msm_hs_dmov_tx_callback;