USB: cp210x: add support for Corsair usb dongle

[pandora-kernel.git] / drivers / tty / n_tty.c

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 39d6ab6..bac83d8 100644 (file)
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1530,6 +1530,14 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
                        tty->real_raw = 0;
        }
        n_tty_set_room(tty);
+       /*
+        * Fix tty hang when I_IXON(tty) is cleared, but the tty
+        * been stopped by STOP_CHAR(tty) before it.
+        */
+       if (!I_IXON(tty) && old && (old->c_iflag & IXON) && !tty->flow_stopped) {
+               start_tty(tty);
+       }
+
        /* The termios change make the tty ready for I/O */
        wake_up_interruptible(&tty->write_wait);
        wake_up_interruptible(&tty->read_wait);
@@ -1728,7 +1736,8 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 
 do_it_again:
 
-       BUG_ON(!tty->read_buf);
+       if (WARN_ON(!tty->read_buf))
+               return -EAGAIN;
 
        c = job_control(tty, file);
        if (c < 0)
@@ -1988,7 +1997,9 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
                                tty->ops->flush_chars(tty);
                } else {
                        while (nr > 0) {
+                               mutex_lock(&tty->output_lock);
                                c = tty->ops->write(tty, b, nr);
+                               mutex_unlock(&tty->output_lock);
                                if (c < 0) {
                                        retval = c;
                                        goto break_out;