diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index ab383d1f59e2e29489f48e88064093d51e8773e0..3cb68af904561ddeafac166a2b10fb053b3b8398 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -325,6 +325,8 @@ static int aac_biosparm(struct scsi_device *sdev, struct block_device *bdev,
 	 *	translations ( 64/32, 128/32, 255/63 ).
 	 */
 	buf = scsi_bios_ptable(bdev);
+	if (!buf)
+		return 0;
 	if(*(__le16 *)(buf + 0x40) == cpu_to_le16(0xaa55)) {
 		struct partition *first = (struct partition * )buf;
 		struct partition *entry = first;