USB: serial: add special case for processing of empty read urbs
Return immediately from generic process_read_urb if urb is empty.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index fcd30b8..a817ced 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -324,6 +324,9 @@
char *ch = (char *)urb->transfer_buffer;
int i;
+ if (!urb->actual_length)
+ return;
+
tty = tty_port_tty_get(&port->port);
if (!tty)
return;