diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 2a586e6489da..9bf9430209b0 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -4899,14 +4899,14 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
 		seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf);
 
 		ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2);
-		if (ret) {
+		if (ret != 2) {
 			seq_printf(m, "faux/mst read failed\n");
 			goto out;
 		}
 		seq_printf(m, "faux/mst: %*ph\n", 2, buf);
 
 		ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1);
-		if (ret) {
+		if (ret != 1) {
 			seq_printf(m, "mst ctrl read failed\n");
 			goto out;
 		}
@@ -4914,7 +4914,7 @@ void drm_dp_mst_dump_topology(struct seq_file *m,
 
 		/* dump the standard OUI branch header */
 		ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE);
-		if (ret) {
+		if (ret != DP_BRANCH_OUI_HEADER_SIZE) {
 			seq_printf(m, "branch oui read failed\n");
 			goto out;
 		}