qlcnic: Fix panic while dumping TX queues on TX timeout

o In case of non-multi TX queue mode driver does not initialize "crb_intr_mask" pointer
  and driver was accessing that un-initialized pointer while dumping TX queue.
  So dump "crb_intr_mask" only when it is initilaized.

Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
index 0bc914859e38..be789513774c 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
@@ -2943,9 +2943,13 @@ static void qlcnic_dump_tx_rings(struct qlcnic_adapter *adapter)
                             tx_ring->tx_stats.xmit_called,
                             tx_ring->tx_stats.xmit_on,
                             tx_ring->tx_stats.xmit_off);
+
+                if (tx_ring->crb_intr_mask)
+                        netdev_info(netdev, "crb_intr_mask=%d\n",
+                                    readl(tx_ring->crb_intr_mask));
+
                 netdev_info(netdev,
-                            "crb_intr_mask=%d, hw_producer=%d, sw_producer=%d sw_consumer=%d, hw_consumer=%d\n",
-                            readl(tx_ring->crb_intr_mask),
+                            "hw_producer=%d, sw_producer=%d sw_consumer=%d, hw_consumer=%d\n",
                             readl(tx_ring->crb_cmd_producer),
                             tx_ring->producer, tx_ring->sw_consumer,
                             le32_to_cpu(*(tx_ring->hw_consumer)));