diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index a52cc7fe45e..c18bbbf04e4 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -323,6 +323,9 @@ static int cciss_seq_show(struct seq_file *seq, void *v)
 	if (*pos > h->highest_lun)
 		return 0;
 
+	if (drv == NULL) /* it's possible for h->drv[] to have holes. */
+		return 0;
+
 	if (drv->heads == 0)
 		return 0;