[Intel-gfx] [PATCH 1/4] drm/i915/gt: Cleanup partial engine discovery failures

[Matt Roper]

From: Chris Wilson <chris.p.wil...@intel.com>

If we abort driver initialisation in the middle of gt/engine discovery,
some engines will be fully setup and some not. Those incompletely setup
engines only have 'engine->release == NULL' and so will leak any of the
common objects allocated.

Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Janusz Krzysztofik <janusz.krzyszto...@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.ro...@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine_cs.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c 
b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 1f7188129cd1..bff12b4ec314 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -1196,6 +1196,12 @@ void intel_engine_destroy_pinned_context(struct 
intel_context *ce)
        intel_context_put(ce);
 }
 
+static void destroy_pinned_context(struct intel_context *ce)
+{
+       if (ce)
+               intel_engine_destroy_pinned_context(ce);
+}
+
 static struct intel_context *
 create_kernel_context(struct intel_engine_cs *engine)
 {
@@ -1274,8 +1280,13 @@ int intel_engines_init(struct intel_gt *gt)
                        return err;
 
                err = setup(engine);
-               if (err)
+               if (err) {
+                       intel_engine_cleanup_common(engine);
                        return err;
+               }
+
+               /* The backend should now be responsible for cleanup */
+               GEM_BUG_ON(engine->release == NULL);
 
                err = engine_init_common(engine);
                if (err)
@@ -1307,8 +1318,7 @@ void intel_engine_cleanup_common(struct intel_engine_cs 
*engine)
        if (engine->default_state)
                fput(engine->default_state);
 
-       if (engine->kernel_context)
-               intel_engine_destroy_pinned_context(engine->kernel_context);
+       destroy_pinned_context(engine->kernel_context);
 
        GEM_BUG_ON(!llist_empty(&engine->barrier_tasks));
        cleanup_status_page(engine);
-- 
2.37.3