drm/xe/guc: Synchronize Dead CT worker with unbind

Cancel and wait for any Dead CT worker to complete before continuing
with device unbinding. Else the worker will end up using resources freed
by the undind operation.

Cc: Zhanjun Dong <zhanjun.dong@intel.com>
Fixes: d2c5a5a926f4 ("drm/xe/guc: Dead CT helper")
Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Link: https://patch.msgid.link/20251103123144.3231829-6-balasubramani.vivekanandan@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
(cherry picked from commit 492671339114e376aaa38626d637a2751cdef263)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
index 18f6327..283d846 100644 (file)
--- a/drivers/gpu/drm/xe/xe_guc_ct.c
+++ b/drivers/gpu/drm/xe/xe_guc_ct.c
@@ -200,6 +200,9 @@ static void guc_ct_fini(struct drm_device *drm, void *arg)
 {
        struct xe_guc_ct *ct = arg;
 
+#if IS_ENABLED(CONFIG_DRM_XE_DEBUG)
+       cancel_work_sync(&ct->dead.worker);
+#endif
        ct_exit_safe_mode(ct);
        destroy_workqueue(ct->g2h_wq);
        xa_destroy(&ct->fence_lookup);