drivers/misc/ti-st: Prefer tty_driver_flush_buffer

The tty core provides an interface for flushing the driver's
write buffer: tty_driver_flush_buffer(); prefer the provided
interface over open-coded. Open-coding can lead to errors
such as the duplicated call in the st_kim driver.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c
index 8d64b68..3aed525 100644
--- a/drivers/misc/ti-st/st_core.c
+++ b/drivers/misc/ti-st/st_core.c
@@ -812,7 +812,7 @@
 	kfree_skb(st_gdata->tx_skb);
 	st_gdata->tx_skb = NULL;
 
-	tty->ops->flush_buffer(tty);
+	tty_driver_flush_buffer(tty);
 	return;
 }
 
diff --git a/drivers/misc/ti-st/st_kim.c b/drivers/misc/ti-st/st_kim.c
index 96853a0..9d3dbb2 100644
--- a/drivers/misc/ti-st/st_kim.c
+++ b/drivers/misc/ti-st/st_kim.c
@@ -531,7 +531,6 @@
 		/* Flush any pending characters in the driver and discipline. */
 		tty_ldisc_flush(tty);
 		tty_driver_flush_buffer(tty);
-		tty->ops->flush_buffer(tty);
 	}
 
 	/* send uninstall notification to UIM */