config/udev: ignore change on drm devices

for input devices we handle change like remove/add, but for
drm devices we get change events when we hotplug outputs,
so lets just ignore change at this level, and let the drivers
handle it. We may in the future want to route driver udev
from here instead.

Reported-by: Timo Aaltonen <[email protected]>
Reviewed-by: Keith Packard <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>

Author: airlied

config/udev.c

@@ -300,9 +300,15 @@ wakeup_handler(pointer data, int err, pointer read_mask)
             return;
         action = udev_device_get_action(udev_device);
         if (action) {
-            if (!strcmp(action, "add") || !strcmp(action, "change")) {
+            if (!strcmp(action, "add")) {
                 device_removed(udev_device);
                 device_added(udev_device);
+            } else if (!strcmp(action, "change")) {
+                /* ignore change for the drm devices */
+                if (strcmp(udev_device_get_subsystem(udev_device), "drm")) {
+                    device_removed(udev_device);
+                    device_added(udev_device);
+                }
             }
             else if (!strcmp(action, "remove"))
                 device_removed(udev_device);