Seems to be done this way in other drivers (ch341, 8250, ...).
And get tty reference only if dcd_change need to be called.
Signed-off-by: Paul Chavent <paul.chavent@xxxxxxxx>
---
drivers/usb/serial/pl2303.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index e7a84f0..8b81188 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -854,15 +854,16 @@ static void pl2303_update_line_status(struct usb_serial_port *port,
spin_unlock_irqrestore(&priv->lock, flags);
if (priv->line_status & UART_BREAK_ERROR)
usb_serial_handle_break(port);
- wake_up_interruptible(&port->port.delta_msr_wait);
- tty = tty_port_tty_get(&port->port);
- if (!tty)
- return;
- if ((priv->line_status ^ prev_line_status) & UART_DCD)
- usb_serial_handle_dcd_change(port, tty,
- priv->line_status & UART_DCD);
- tty_kref_put(tty);
+ if ((priv->line_status ^ prev_line_status) & UART_DCD) {
+ tty = tty_port_tty_get(&port->port);
+ if (tty)
+ usb_serial_handle_dcd_change(port, tty,
+ priv->line_status & UART_DCD);
+ tty_kref_put(tty);
+ }
+
+ wake_up_interruptible(&port->port.delta_msr_wait);
}
static void pl2303_read_int_callback(struct urb *urb)
--
1.7.12.1
--
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