bnxt_en: Check for NULL rx or tx ring.

Orabug: 23221795

Each bnxt_napi structure may no longer be having both an rx ring and
a tx ring.  Check for a valid ring before using it.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 3b2b7d9db74adb95aa0bd029298a741333eb847e)
Signed-off-by: Brian Maly <brian.maly@oracle.com>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 85b3e7279967b2c371b7ba6375b0032eb562eaaf..0b4e6871869224f263bea4229646f960add969f2 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1870,6 +1870,9 @@ static void bnxt_init_ring_struct(struct bnxt *bp)
                ring->vmem_size = 0;
 
                rxr = bnapi->rx_ring;
+               if (!rxr)
+                       goto skip_rx;
+
                ring = &rxr->rx_ring_struct;
                ring->nr_pages = bp->rx_nr_pages;
                ring->page_size = HW_RXBD_RING_SIZE;
@@ -1886,7 +1889,11 @@ static void bnxt_init_ring_struct(struct bnxt *bp)
                ring->vmem_size = SW_RXBD_AGG_RING_SIZE * bp->rx_agg_nr_pages;
                ring->vmem = (void **)&rxr->rx_agg_ring;
 
+skip_rx:
                txr = bnapi->tx_ring;
+               if (!txr)
+                       continue;
+
                ring = &txr->tx_ring_struct;
                ring->nr_pages = bp->tx_nr_pages;
                ring->page_size = HW_RXBD_RING_SIZE;
@@ -2403,13 +2410,17 @@ static void bnxt_clear_ring_indices(struct bnxt *bp)
                cpr->cp_raw_cons = 0;
 
                txr = bnapi->tx_ring;
-               txr->tx_prod = 0;
-               txr->tx_cons = 0;
+               if (txr) {
+                       txr->tx_prod = 0;
+                       txr->tx_cons = 0;
+               }
 
                rxr = bnapi->rx_ring;
-               rxr->rx_prod = 0;
-               rxr->rx_agg_prod = 0;
-               rxr->rx_sw_agg_prod = 0;
+               if (rxr) {
+                       rxr->rx_prod = 0;
+                       rxr->rx_agg_prod = 0;
+                       rxr->rx_sw_agg_prod = 0;
+               }
        }
 }
 
@@ -5018,6 +5029,9 @@ static void bnxt_dump_tx_sw_state(struct bnxt_napi *bnapi)
        struct bnxt_tx_ring_info *txr = bnapi->tx_ring;
        int i = bnapi->index;
 
+       if (!txr)
+               return;
+
        netdev_info(bnapi->bp->dev, "[%d]: tx{fw_ring: %d prod: %x cons: %x}\n",
                    i, txr->tx_ring_struct.fw_ring_id, txr->tx_prod,
                    txr->tx_cons);
@@ -5028,6 +5042,9 @@ static void bnxt_dump_rx_sw_state(struct bnxt_napi *bnapi)
        struct bnxt_rx_ring_info *rxr = bnapi->rx_ring;
        int i = bnapi->index;
 
+       if (!rxr)
+               return;
+
        netdev_info(bnapi->bp->dev, "[%d]: rx{fw_ring: %d prod: %x} rx_agg{fw_ring: %d agg_prod: %x sw_agg_prod: %x}\n",
                    i, rxr->rx_ring_struct.fw_ring_id, rxr->rx_prod,
                    rxr->rx_agg_ring_struct.fw_ring_id, rxr->rx_agg_prod,