diff options
Diffstat (limited to 'drivers/char/n_hdlc.c')
| -rw-r--r-- | drivers/char/n_hdlc.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/char/n_hdlc.c b/drivers/char/n_hdlc.c index 337a87f86a3..e8332f305d7 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) @@ -780,13 +785,14 @@ static unsigned int n_hdlc_tty_poll(struct tty_struct *tty, struct file *filp, poll_wait(filp, &tty->write_wait, wait); /* set bits for operations that won't block */ - if(n_hdlc->rx_buf_list.head) + if (n_hdlc->rx_buf_list.head) mask |= POLLIN | POLLRDNORM; /* readable */ if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) mask |= POLLHUP; - if(tty_hung_up_p(filp)) + if (tty_hung_up_p(filp)) mask |= POLLHUP; - if(n_hdlc->tx_free_buf_list.head) + if (!tty_is_writelocked(tty) && + n_hdlc->tx_free_buf_list.head) mask |= POLLOUT | POLLWRNORM; /* writable */ } return mask; @@ -861,7 +867,7 @@ static void n_hdlc_buf_put(struct n_hdlc_buf_list *list, spin_lock_irqsave(&list->spinlock,flags); buf->link=NULL; - if(list->tail) + if (list->tail) list->tail->link = buf; else list->head = buf; |