[SCSI] mvsas: check subsystem id

add support for mv6480 chip which subsystem id is 6480 in spite of device id is 6440.

Signed-off-by: Ke Wei <kewei@marvell.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/mvsas.c b/drivers/scsi/mvsas.c
index b5de3d0..e55b903 100644
--- a/drivers/scsi/mvsas.c
+++ b/drivers/scsi/mvsas.c
@@ -3163,6 +3163,15 @@
 static struct pci_device_id __devinitdata mvs_pci_table[] = {
 	{ PCI_VDEVICE(MARVELL, 0x6320), chip_6320 },
 	{ PCI_VDEVICE(MARVELL, 0x6340), chip_6440 },
+	{
+		.vendor 	= PCI_VENDOR_ID_MARVELL,
+		.device 	= 0x6440,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= 0x6480,
+		.class		= 0,
+		.class_mask	= 0,
+		.driver_data	= chip_6480,
+	},
 	{ PCI_VDEVICE(MARVELL, 0x6440), chip_6440 },
 	{ PCI_VDEVICE(MARVELL, 0x6480), chip_6480 },