[PATCH v9 4/9] drm/i915/gt: Pass the -EINVAL when emit_pte doesn't update any PTE

[Ramalingam C]

When emit_pte doesn't update any PTE with return value as 0, interpret
it as -EINVAL.

v2:
  Add missing goto [Thomas]

Signed-off-by: Ramalingam C <ramalinga...@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_migrate.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_migrate.c 
b/drivers/gpu/drm/i915/gt/intel_migrate.c
index e0f1c727662e..6378d4450e1a 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -577,7 +577,11 @@ intel_context_migrate_copy(struct intel_context *ce,
 
                len = emit_pte(rq, &it_src, src_cache_level, src_is_lmem,
                               src_offset, CHUNK_SZ);
-               if (len <= 0) {
+               if (!len) {
+                       err = -EINVAL;
+                       goto out_rq;
+               }
+               if (len < 0) {
                        err = len;
                        goto out_rq;
                }
-- 
2.20.1