[Intel-gfx] [PATCH v8 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.

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_migrate.c | 4 +++-
 1 file changed, 3 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..f9f3b0e7ed87 100644
--- a/drivers/gpu/drm/i915/gt/intel_migrate.c
+++ b/drivers/gpu/drm/i915/gt/intel_migrate.c
@@ -577,7 +577,9 @@ 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;
+		if (len < 0) {
 			err = len;
 			goto out_rq;
 		}
-- 
2.20.1