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| author | Seth Bollinger <sethb@digi.com> | 2014-03-25 12:55:37 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-16 14:17:43 -0700 |
| commit | 717f3bbab3c7628736ef738fdbf3d9a28578c26c (patch) | |
| tree | 3cacb3b09404f9717efe37ba43267655d9a3809b /drivers | |
| parent | 4ea8dafd2475e26b3cee3836bc6e6fddbdfb2721 (diff) | |
| download | linux-717f3bbab3c7628736ef738fdbf3d9a28578c26c.tar.gz linux-717f3bbab3c7628736ef738fdbf3d9a28578c26c.tar.bz2 linux-717f3bbab3c7628736ef738fdbf3d9a28578c26c.zip | |
serial_core: Fix conditional start_tx on ring buffer not empty
If the serial_core ring buffer empties just as the tty layer receives
an XOFF, then start_tx will never be called when the tty layer
receives an XON as the serial_core ring buffer is empty. This will
possibly leave a few bytes trapped in the fifo for drivers that
disable the transmitter when flow controlled.
Signed-off-by: Seth Bollinger <sethb@digi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 2cf5649a6dc0..dd1a7bef6647 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -89,8 +89,7 @@ static void __uart_start(struct tty_struct *tty) struct uart_state *state = tty->driver_data; struct uart_port *port = state->uart_port; - if (!uart_circ_empty(&state->xmit) && state->xmit.buf && - !tty->stopped && !tty->hw_stopped) + if (!tty->stopped && !tty->hw_stopped) port->ops->start_tx(port); } |