config/udev: Respect seat assignments when assigned devices

Jonathan Dieter posted a few patches to do this inside the Xorg
server but it makes no sense to do it there, just have the code
we use to probe the device list at startup check seat assignments
using the same code we check at hotplug time.

Bugilla: https://bugzilla.redhat.com/show_bug.cgi?id=1183654
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Jonathan Dieter <jdieter@lesbg.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
(cherry picked from commit 697b696)

config/udev.c

@@ -69,6 +69,24 @@ static const char *itoa(int i)
     return itoa_buf;
 }
 
+static Bool
+check_seat(struct udev_device *udev_device)
+{
+    const char *dev_seat;
+
+    dev_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
+    if (!dev_seat)
+        dev_seat = "seat0";
+
+    if (SeatId && strcmp(dev_seat, SeatId))
+        return FALSE;
+
+    if (!SeatId && strcmp(dev_seat, "seat0"))
+        return FALSE;
+
+    return TRUE;
+}
+
 static void
 device_added(struct udev_device *udev_device)
 {
@@ -83,7 +101,6 @@ device_added(struct udev_device *udev_device)
     struct udev_list_entry *set, *entry;
     struct udev_device *parent;
     int rc;
-    const char *dev_seat;
     dev_t devnum;
 
     path = udev_device_get_devnode(udev_device);
@@ -93,14 +110,7 @@ device_added(struct udev_device *udev_device)
     if (!path || !syspath)
         return;
 
-    dev_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
-    if (!dev_seat)
-        dev_seat = "seat0";
-
-    if (SeatId && strcmp(dev_seat, SeatId))
-        return;
-
-    if (!SeatId && strcmp(dev_seat, "seat0"))
+    if (!check_seat(udev_device))
         return;
 
     devnum = udev_device_get_devnum(udev_device);
@@ -506,6 +516,8 @@ config_udev_odev_probe(config_odev_probe_proc_ptr probe_callback)
             goto no_probe;
         else if (strncmp(sysname, "card", 4) != 0)
             goto no_probe;
+        else if (!check_seat(udev_device))
+            goto no_probe;
 
         config_udev_odev_setup_attribs(path, syspath, major(devnum),
                                        minor(devnum), probe_callback);