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>

diff --git a/drivers/char/n_hdlc.c b/drivers/char/n_hdlc.c
index 37f7d3403040395bd1a5abfb484c5b76c77fc015..e8332f305d72a77b9e8d0579b8b222d5e66ea0ea 100644 (file)
--- 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)