Query hardware-buffer status in chars_in_buffer should the write fifo be
empty.
This is needed to make the tty layer wait for hardware buffers to drain
on close.
Signed-off-by: Johan Hovold <jhov...@gmail.com>
---
drivers/usb/serial/io_ti.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index 3abbdaa..590f27d 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -2088,6 +2088,7 @@ static int edge_chars_in_buffer(struct tty_struct *tty)
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
int chars = 0;
unsigned long flags;
+ int ret;
if (edge_port == NULL)
return 0;
@@ -2098,6 +2099,12 @@ static int edge_chars_in_buffer(struct tty_struct *tty)
chars = kfifo_len(&edge_port->write_fifo);
spin_unlock_irqrestore(&edge_port->ep_lock, flags);
+ if (!chars) {
+ ret = tx_active(edge_port);
+ if (ret > 0)
+ chars = ret;
+ }
+
dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
return chars;
}
--
1.8.1
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