qlcnic: Disable INT-x interrupt for 83xx on driver unload

o Set HW mask for 8300 Series adapter, in INT-x mode, to
  stop generating interrupt during driver unload.
Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: Shahed Shaikh <shahed.shaikh@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.c

@@ -312,6 +312,11 @@ inline void qlcnic_83xx_clear_legacy_intr_mask(struct qlcnic_adapter *adapter)
 	writel(0, adapter->tgt_mask_reg);
 }
 
+inline void qlcnic_83xx_set_legacy_intr_mask(struct qlcnic_adapter *adapter)
+{
+	writel(1, adapter->tgt_mask_reg);
+}
+
 /* Enable MSI-x and INT-x interrupts */
 void qlcnic_83xx_enable_intr(struct qlcnic_adapter *adapter,
 			     struct qlcnic_host_sds_ring *sds_ring)
@@ -458,6 +463,9 @@ void qlcnic_83xx_free_mbx_intr(struct qlcnic_adapter *adapter)
 {
 	u32 num_msix;
 
+	if (!(adapter->flags & QLCNIC_MSIX_ENABLED))
+		qlcnic_83xx_set_legacy_intr_mask(adapter);
+
 	qlcnic_83xx_disable_mbx_intr(adapter);
 
 	if (adapter->flags & QLCNIC_MSIX_ENABLED)