diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 5820943..30fb979 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -2552,8 +2552,7 @@
 
 	dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
 		     &pfxdata, sizeof(pfxdata), total_data_size);
-
-	return rc;
+	return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
 }
 
 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(