diff --git a/[refs] b/[refs]
index 3f17fa6f1900..744e87631fff 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 05f225dc8729d3e5703b8c34e750fdca67bcefe6
+refs/heads/master: 283fef59d6e934e8da11631446ea8e2e93fce14c
diff --git a/trunk/drivers/char/tty_io.c b/trunk/drivers/char/tty_io.c
index 8b2a59969868..bd74e82d8a72 100644
--- a/trunk/drivers/char/tty_io.c
+++ b/trunk/drivers/char/tty_io.c
@@ -2621,10 +2621,9 @@ int tty_ioctl(struct inode * inode, struct file * file,
 			tty->driver->break_ctl(tty, 0);
 			return 0;
 		case TCSBRK:   /* SVID version: non-zero arg --> no break */
-			/*
-			 * XXX is the above comment correct, or the
-			 * code below correct?  Is this ioctl used at
-			 * all by anyone?
+			/* non-zero arg means wait for all output data
+			 * to be sent (performed above) but don't send break.
+			 * This is used by the tcdrain() termios function.
 			 */
 			if (!arg)
 				return send_break(tty, 250);