drm/i915/huc: fix leak of debug object in huc load fence on driver unload

The fence is always initialized in huc_init_early, but the cleanup in
huc_fini is only being run if HuC is enabled. This causes a leaking of
the debug object when HuC is disabled/not supported, which can in turn
trigger a warning if we try to register a new debug offset at the same
address on driver reload.

To fix the issue, make sure to always run the cleanup code.

Reported-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reported-by: Brian Norris <briannorris@chromium.org>
Fixes: 27536e03271d ("drm/i915/huc: track delayed HuC load with a fence")
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Brian Norris <briannorris@chromium.org>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Tested-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221111005651.4160369-1-daniele.ceraolospurio@intel.com

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.c b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
index be85581..0976e91 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/intel_huc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
@@ -329,13 +329,15 @@ out:
 
 void intel_huc_fini(struct intel_huc *huc)
 {
-       if (!intel_uc_fw_is_loadable(&huc->fw))
-               return;
-
+       /*
+        * the fence is initialized in init_early, so we need to clean it up
+        * even if HuC loading is off.
+        */
        delayed_huc_load_complete(huc);
-
        i915_sw_fence_fini(&huc->delayed_load.fence);
-       intel_uc_fw_fini(&huc->fw);
+
+       if (intel_uc_fw_is_loadable(&huc->fw))
+               intel_uc_fw_fini(&huc->fw);
 }
 
 void intel_huc_suspend(struct intel_huc *huc)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
index 1d28286..2a508b1 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.c
@@ -722,6 +722,7 @@ int intel_uc_runtime_resume(struct intel_uc *uc)
 
 static const struct intel_uc_ops uc_ops_off = {
        .init_hw = __uc_check_hw,
+       .fini = __uc_fini, /* to clean-up the init_early initialization */
 };
 
 static const struct intel_uc_ops uc_ops_on = {