if (!timeout)
timeout = MAX_SCHEDULE_TIMEOUT;
if (wait_event_interruptible_timeout(tty->write_wait,
- !tty->driver->chars_in_buffer(tty), timeout))
+ !tty->driver->chars_in_buffer(tty), timeout) < 0)
return;
if (tty->driver->wait_until_sent)
tty->driver->wait_until_sent(tty, timeout);
EXPORT_SYMBOL(tty_termios_copy_hw);
+/**
+ * tty_termios_hw_change - check for setting change
+ * @a: termios
+ * @b: termios to compare
+ *
+ * Check if any of the bits that affect a dumb device have changed
+ * between the two termios structures, or a speed change is needed.
+ */
+
+int tty_termios_hw_change(struct ktermios *a, struct ktermios *b)
+{
+ if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed)
+ return 1;
+ if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL))
+ return 1;
+ return 0;
+}
+EXPORT_SYMBOL(tty_termios_hw_change);
+
/**
* change_termios - update termios values
* @tty: tty to update