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

[Jia-Ju Bai]

When i915_random_order() returns NULL to order, no error return code of
igt_buddy_alloc_smoke() is assigned.
To fix this bug, err is assigned with -EINVAL in this case.

Fixes: 1fe3818d17c9 ("drm/i915/selftests: try to rein in alloc_smoke")
Reported-by: TOTE Robot <os...@tsinghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com>
---
 drivers/gpu/drm/i915/selftests/i915_buddy.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/selftests/i915_buddy.c 
b/drivers/gpu/drm/i915/selftests/i915_buddy.c
index 632b912b0bc9..cf9b551b77e1 100644
--- a/drivers/gpu/drm/i915/selftests/i915_buddy.c
+++ b/drivers/gpu/drm/i915/selftests/i915_buddy.c
@@ -318,8 +318,10 @@ static int igt_buddy_alloc_smoke(void *arg)
        }
 
        order = i915_random_order(mm.max_order + 1, &prng);
-       if (!order)
+       if (!order) {
+               err = -EINVAL;
                goto out_fini;
+       }
 
        for (i = 0; i <= mm.max_order; ++i) {
                struct i915_buddy_block *block;
-- 
2.17.1