[PATCH] USB console: fix disconnection issues
Prevent sending further output to a USB-serial console after the dongle is
disconnected, take care not to leak kref.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
index fc4a0f7..f3404e1 100644
--- a/drivers/usb/serial/console.c
+++ b/drivers/usb/serial/console.c
@@ -202,7 +202,7 @@
struct usb_serial *serial;
int retval = -ENODEV;
- if (!port)
+ if (!port || port->serial->dev->state == USB_STATE_NOTATTACHED)
return;
serial = port->serial;
@@ -255,6 +255,14 @@
.index = -1,
};
+void usb_serial_console_disconnect(struct usb_serial *serial)
+{
+ if (serial && serial->port && serial->port[0] && serial->port[0] == usbcons_info.port) {
+ usb_serial_console_exit();
+ usb_serial_put(serial);
+ }
+}
+
void usb_serial_console_init (int serial_debug, int minor)
{
debug = serial_debug;
@@ -280,6 +288,11 @@
void usb_serial_console_exit (void)
{
- unregister_console(&usbcons);
+ if (usbcons_info.port) {
+ unregister_console(&usbcons);
+ if (usbcons_info.port->open_count)
+ usbcons_info.port->open_count--;
+ usbcons_info.port = NULL;
+ }
}