diff --git a/drivers/firmware/cirrus/cs_dsp.c b/drivers/firmware/cirrus/cs_dsp.c
index 6a9aa97373d3..49b70c70dc69 100644
--- a/drivers/firmware/cirrus/cs_dsp.c
+++ b/drivers/firmware/cirrus/cs_dsp.c
@@ -978,7 +978,8 @@ static int cs_dsp_create_control(struct cs_dsp *dsp,
 		    ctl->alg_region.alg == alg_region->alg &&
 		    ctl->alg_region.type == alg_region->type) {
 			if ((!subname && !ctl->subname) ||
-			    (subname && !strncmp(ctl->subname, subname, ctl->subname_len))) {
+			    (subname && (ctl->subname_len == subname_len) &&
+			     !strncmp(ctl->subname, subname, ctl->subname_len))) {
 				if (!ctl->enabled)
 					ctl->enabled = 1;
 				return 0;