drm/i915/selftests: Reorder error cleanup for whitelist checking

Reorder the error paths so that we unwind all the locals from any error
path and so avoid setting off divers alarum in case we find an error in
case we find an error.

References: https://bugs.freedesktop.org/show_bug.cgi?id=111048Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190708152321.22187-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gt/selftest_workarounds.c

@@ -287,7 +287,7 @@ static int check_whitelist_across_reset(struct intel_engine_cs *engine,
 					const char *name)
 {
 	struct drm_i915_private *i915 = engine->i915;
-	struct i915_gem_context *ctx;
+	struct i915_gem_context *ctx, *tmp;
 	struct igt_spinner spin;
 	intel_wakeref_t wakeref;
 	int err;
@@ -295,56 +295,59 @@ static int check_whitelist_across_reset(struct intel_engine_cs *engine,
 	pr_info("Checking %d whitelisted registers (RING_NONPRIV) [%s]\n",
 		engine->whitelist.count, name);
 
-	err = igt_spinner_init(&spin, i915);
-	if (err)
-		return err;
-
 	ctx = kernel_context(i915);
 	if (IS_ERR(ctx))
 		return PTR_ERR(ctx);
 
+	err = igt_spinner_init(&spin, i915);
+	if (err)
+		goto out_ctx;
+
 	err = check_whitelist(ctx, engine);
 	if (err) {
 		pr_err("Invalid whitelist *before* %s reset!\n", name);
-		goto out;
+		goto out_spin;
 	}
 
 	err = switch_to_scratch_context(engine, &spin);
 	if (err)
-		goto out;
+		goto out_spin;
 
 	with_intel_runtime_pm(&i915->runtime_pm, wakeref)
 		err = reset(engine);
 
 	igt_spinner_end(&spin);
-	igt_spinner_fini(&spin);
 
 	if (err) {
 		pr_err("%s reset failed\n", name);
-		goto out;
+		goto out_spin;
 	}
 
 	err = check_whitelist(ctx, engine);
 	if (err) {
 		pr_err("Whitelist not preserved in context across %s reset!\n",
 		       name);
-		goto out;
+		goto out_spin;
 	}
 
+	tmp = kernel_context(i915);
+	if (IS_ERR(tmp)) {
+		err = PTR_ERR(tmp);
+		goto out_spin;
+	}
 	kernel_context_close(ctx);
-
-	ctx = kernel_context(i915);
-	if (IS_ERR(ctx))
-		return PTR_ERR(ctx);
+	ctx = tmp;
 
 	err = check_whitelist(ctx, engine);
 	if (err) {
 		pr_err("Invalid whitelist *after* %s reset in fresh context!\n",
 		       name);
-		goto out;
+		goto out_spin;
 	}
 
-out:
+out_spin:
+	igt_spinner_fini(&spin);
+out_ctx:
 	kernel_context_close(ctx);
 	return err;
 }