logind: filter out input devices that have none of the keys/switche we care about

Let's check what keys are there, before we actually hang on to the
opened devices.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/login/logind-core.c b/src/login/logind-core.c
index e505fcb0e..7e6b63f12 100644
--- a/src/login/logind-core.c
+++ b/src/login/logind-core.c
@@ -269,7 +269,11 @@ int manager_process_button_device(Manager *m, struct udev_device *d) {
                         sn = "seat0";
 
                 button_set_seat(b, sn);
-                button_open(b);
+
+                r = button_open(b);
+                if (r < 0) /* event device doesn't have any keys or switches relevant to us? (or any other error
+                            * opening the device?) let's close the button again. */
+                        button_free(b);
         }
 
         return 0;