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 37f7d34..e8332f3 100644
--- a/drivers/char/n_hdlc.c
+++ b/drivers/char/n_hdlc.c
@@ -400,7 +400,12 @@
/* 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)