Char: n_hdlc, allow RESTARTSYS retval of tty write

Acked-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/char/n_hdlc.c b/drivers/char/n_hdlc.c
index 37f7d3403040..e8332f305d72 100644
--- a/drivers/char/n_hdlc.c
+++ b/drivers/char/n_hdlc.c
@@ -400,7 +400,12 @@ static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)
                 /* Send the next block of data to device */
                 tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
                 actual = tty->driver->write(tty, tbuf->buf, tbuf->count);
-                    
+
+                /* rollback was possible and has been done */
+                if (actual == -ERESTARTSYS) {
+                        n_hdlc->tbuf = tbuf;
+                        break;
+                }
                 /* if transmit error, throw frame away by */
                 /* pretending it was accepted by driver */
                 if (actual < 0)