[PATCH] gpu: drm: i915: fix error return code of igt_threaded_blt()

[Jia-Ju Bai <baijiaju1990@gmail.com>]

When kcalloc() returns NULL to tsk or thread, no error code of 
igt_threaded_blt() is returned.
To fix this bug, -ENOMEM is returned as error code.

Fixes: 0e99f939f08f ("drm/i915/selftests/blt: add some kthreads into the mix")
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
---
 drivers/gpu/drm/i915/gem/selftests/i915_gem_object_blt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_object_blt.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_object_blt.c
index 23b6e11bbc3e..b54ba8a1fcec 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_object_blt.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_object_blt.c
@@ -471,11 +471,13 @@ static int igt_threaded_blt(struct intel_engine_cs *engine,
 
 	tsk = kcalloc(n_cpus, sizeof(struct task_struct *), GFP_KERNEL);
 	if (!tsk)
-		return 0;
+		return -ENOMEM;
 
 	thread = kcalloc(n_cpus, sizeof(struct igt_thread_arg), GFP_KERNEL);
-	if (!thread)
+	if (!thread) {
+		err = -ENOMEM;
 		goto out_tsk;
+	}
 
 	thread[0].file = mock_file(engine->i915);
 	if (IS_ERR(thread[0].file)) {
-- 
2.17.1