msm: tty: update receive room just before writing data to the ldisc
There is a corner case in the tty driver where the value of
tty->receive_room is not being updated before writing data to
the line discipline. When this happens, data is lost because
of failure to re-submit any remaining data to the ldisc.
This fix is dependent on a new tty flag that is set only when
the tty driver is used for efs sync betweem the mdm modem and
the applications processor.
CRs-Fixed: 358868
Change-Id: I0ba02980504b4d8187b8c83111c2c883d194efa2
Signed-off-by: Joel King <joelking@codeaurora.org>
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 366df67..c3f741b 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -495,6 +495,7 @@
/* explicitly set the driver mode to raw */
tty->raw = 1;
tty->real_raw = 1;
+ tty->update_room_in_ldisc = 1;
set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
dbg("%s", __func__);