diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index d067b44f1425..01823ce87801 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1650,17 +1650,19 @@ static void uart_wait_until_sent(struct tty_struct *tty, int timeout) if (timeout && timeout < char_time) char_time = timeout; - /* - * If the transmitter hasn't cleared in twice the approximate - * amount of time to send the entire FIFO, it probably won't - * ever clear. This assumes the UART isn't doing flow - * control, which is currently the case. Hence, if it ever - * takes longer than port->timeout, this is probably due to a - * UART bug of some kind. So, we clamp the timeout parameter at - * 2*port->timeout. - */ - if (timeout == 0 || timeout > 2 * port->timeout) - timeout = 2 * port->timeout; + if (!uart_cts_enabled(port)) { + /* + * If the transmitter hasn't cleared in twice the approximate + * amount of time to send the entire FIFO, it probably won't + * ever clear. This assumes the UART isn't doing flow + * control, which is currently the case. Hence, if it ever + * takes longer than port->timeout, this is probably due to a + * UART bug of some kind. So, we clamp the timeout parameter at + * 2*port->timeout. + */ + if (timeout == 0 || timeout > 2 * port->timeout) + timeout = 2 * port->timeout; + } expire = jiffies + timeout; @@ -1676,7 +1678,7 @@ static void uart_wait_until_sent(struct tty_struct *tty, int timeout) msleep_interruptible(jiffies_to_msecs(char_time)); if (signal_pending(current)) break; - if (time_after(jiffies, expire)) + if (timeout && time_after(jiffies, expire)) break; } uart_port_deref(port); |