[PATCH][next] drm/i915/query: Use struct_size() helper

[Gustavo A. R. Silva]

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

This code was detected with the help of Coccinelle and, audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_query.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index e75c528ebbe0..c1ebda9b5627 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -109,8 +109,7 @@ query_engine_info(struct drm_i915_private *i915,
 	for_each_uabi_engine(engine, i915)
 		num_uabi_engines++;
 
-	len = sizeof(struct drm_i915_query_engine_info) +
-	      num_uabi_engines * sizeof(struct drm_i915_engine_info);
+	len = struct_size(query_ptr, engines, num_uabi_engines);
 
 	ret = copy_query_item(&query, sizeof(query), len, query_item);
 	if (ret != 0)
-- 
2.27.0