[PATCH v3 6/6] drm/amdgpu/ras: Cancel delayed work before ACA teardown in amdgpu_ras_fini

[Sreeraj S Kurup <sreekuttan2156239@gmail.com>]

In amdgpu_ras_fini(), cancel_delayed_work_sync() is currently called
after ACA subsystems and locks are destroyed. If the delayed work
(ras_counte_delay_work) runs concurrently during teardown, it can
evaluate aca_handle_is_valid() right before remove_aca_handle()
frees the handle and destroys its mutex, resulting in a use-after-free
and locking violation.

Move cancel_delayed_work_sync() to the beginning of amdgpu_ras_fini()
to ensure all pending work is flushed and stopped before resource
deallocation starts.

Signed-off-by: Sreeraj S Kurup <sreekuttan2156239@gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index 764cd4950408..118716ad0437 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -4751,6 +4751,7 @@ int amdgpu_ras_fini(struct amdgpu_device *adev)
 	if (!adev->ras_enabled || !con)
 		return 0;
 
+	cancel_delayed_work_sync(&con->ras_counte_delay_work);
 	amdgpu_ras_critical_region_fini(adev);
 	mutex_destroy(&con->critical_region_lock);
 
@@ -4785,8 +4786,6 @@ int amdgpu_ras_fini(struct amdgpu_device *adev)
 	if (AMDGPU_RAS_GET_FEATURES(con->features))
 		amdgpu_ras_disable_all_features(adev, 0);
 
-	cancel_delayed_work_sync(&con->ras_counte_delay_work);
-
 	amdgpu_ras_set_context(adev, NULL);
 	kfree(con);
 
-- 
2.54.0