diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 3f1aa77..76b633a 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -3287,6 +3287,7 @@
 	qc->n_elem = 1;
 	qc->orig_n_elem = 1;
 	qc->buf_virt = buf;
+	qc->nbytes = buflen;
 
 	sg = qc->__sg;
 	sg_init_one(sg, buf, buflen);