drm/i915/selftests: Markup impossible error pointers

If we create a new live_context() we should have a mapping for each
engine. Document that assumption with an assertion.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190827094933.13778-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
index 3adb60c..37a177e 100644 (file)
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
@@ -397,6 +397,7 @@ static int igt_ctx_exec(void *arg)
                        }
 
                        ce = i915_gem_context_get_engine(ctx, engine->legacy_idx);
+                       GEM_BUG_ON(IS_ERR(ce));
 
                        if (!obj) {
                                obj = create_test_object(ce->vm, file, &objects);
@@ -521,6 +522,8 @@ static int igt_shared_ctx_exec(void *arg)
                        __assign_ppgtt(ctx, parent->vm);
 
                        ce = i915_gem_context_get_engine(ctx, engine->legacy_idx);
+                       GEM_BUG_ON(IS_ERR(ce));
+
                        if (!obj) {
                                obj = create_test_object(parent->vm, file, &objects);
                                if (IS_ERR(obj)) {