drm: Small optimization to intel_dp_mst_atomic_master_trans_check

If we want to return from for_each_intel_connector_iter(), one
way is calling drm_connector_list_iter_end() before returning
to avoid memleak. The other way is just breaking from the bracket
and then returning after the outside drm_connector_list_iter_end().
Obviously, the second way makes code smaller and more clear.
Apply it to the function intel_dp_mst_atomic_master_trans_check().

Signed-off-by: He Ying <heying24@huawei.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211022022243.138860-1-heying24@huawei.com

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 0de0b4f..1662017 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -231,6 +231,7 @@ intel_dp_mst_atomic_master_trans_check(struct intel_connector *connector,
        struct drm_i915_private *dev_priv = to_i915(state->base.dev);
        struct drm_connector_list_iter connector_list_iter;
        struct intel_connector *connector_iter;
+       int ret = 0;
 
        if (DISPLAY_VER(dev_priv) < 12)
                return  0;
@@ -243,7 +244,6 @@ intel_dp_mst_atomic_master_trans_check(struct intel_connector *connector,
                struct intel_digital_connector_state *conn_iter_state;
                struct intel_crtc_state *crtc_state;
                struct intel_crtc *crtc;
-               int ret;
 
                if (connector_iter->mst_port != connector->mst_port ||
                    connector_iter == connector)
@@ -252,8 +252,8 @@ intel_dp_mst_atomic_master_trans_check(struct intel_connector *connector,
                conn_iter_state = intel_atomic_get_digital_connector_state(state,
                                                                           connector_iter);
                if (IS_ERR(conn_iter_state)) {
-                       drm_connector_list_iter_end(&connector_list_iter);
-                       return PTR_ERR(conn_iter_state);
+                       ret = PTR_ERR(conn_iter_state);
+                       break;
                }
 
                if (!conn_iter_state->base.crtc)
@@ -262,20 +262,18 @@ intel_dp_mst_atomic_master_trans_check(struct intel_connector *connector,
                crtc = to_intel_crtc(conn_iter_state->base.crtc);
                crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
                if (IS_ERR(crtc_state)) {
-                       drm_connector_list_iter_end(&connector_list_iter);
-                       return PTR_ERR(crtc_state);
+                       ret = PTR_ERR(crtc_state);
+                       break;
                }
 
                ret = drm_atomic_add_affected_planes(&state->base, &crtc->base);
-               if (ret) {
-                       drm_connector_list_iter_end(&connector_list_iter);
-                       return ret;
-               }
+               if (ret)
+                       break;
                crtc_state->uapi.mode_changed = true;
        }
        drm_connector_list_iter_end(&connector_list_iter);
 
-       return 0;
+       return ret;
 }
 
 static int