The DRM scheduler KUnit tests pass NULL for the dev field in drm_sched_init_args, which NULL-pointer dereferences in the drm_sched_job trace event via dev_name() on sched->dev. Give the mock scheduler a device with kunit_device_register(), which is also cleaned up at test exit. A per-function counter keeps the device names unique, since some tests create several mock schedulers. Fixes: 5a99350794fe ("drm/sched: Add scheduler unit testing infrastructure and some basic tests") Cc: stable@vger.kernel.org Signed-off-by: Shixiong Ou <oushixiong@kylinos.cn> Acked-by: Maxime Ripard <mripard@kernel.org> [phasta: removed static variable init to 0 again] Signed-off-by: Philipp Stanner <phasta@kernel.org> Link: https://patch.msgid.link/20260908055941.351486-1-oushixiong1025@163.com