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

[ Upstream commit 95af8f4fdce8349a5fe75264007f1af2aa1082ea ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
index d692e279d9fbfd42181b780400d87e745620ea1f..7619b48dbfe43116150051de5bb43df6a52ec4f0 100644 (file)
--- a/drivers/gpu/drm/xe/xe_guc_ct.c
+++ b/drivers/gpu/drm/xe/xe_guc_ct.c
@@ -188,6 +188,9 @@ 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);