qlcnic: cleanup skb allocation

No need to maintian separate state for alloced and freed skb.
This can be done by null check.

Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 13 insertions, 21 deletions

diff --git a/drivers/net/qlcnic/qlcnic.h b/drivers/net/qlcnic/qlcnic.h
index 99ccdd8ac41..86e47811c25 100644
--- a/drivers/net/qlcnic/qlcnic.h
+++ b/drivers/net/qlcnic/qlcnic.h
@@ -381,7 +381,6 @@ struct qlcnic_rx_buffer {
         struct sk_buff *skb;
         u64 dma;
         u16 ref_handle;
-        u16 state;
 };
 
 /* Board types */
@@ -423,7 +422,6 @@ struct qlcnic_adapter_stats {
         u64  xmit_on;
         u64  xmit_off;
         u64  skb_alloc_failure;
-        u64  null_skb;
         u64  null_rxbuf;
         u64  rx_dma_map_error;
         u64  tx_dma_map_error;
diff --git a/drivers/net/qlcnic/qlcnic_ethtool.c b/drivers/net/qlcnic/qlcnic_ethtool.c
index 3e4822ad5a8..a4f11202271 100644
--- a/drivers/net/qlcnic/qlcnic_ethtool.c
+++ b/drivers/net/qlcnic/qlcnic_ethtool.c
@@ -69,8 +69,6 @@ static const struct qlcnic_stats qlcnic_gstrings_stats[] = {
                 QLC_SIZEOF(stats.xmit_off), QLC_OFF(stats.xmit_off)},
         {"skb_alloc_failure", QLC_SIZEOF(stats.skb_alloc_failure),
                 QLC_OFF(stats.skb_alloc_failure)},
-        {"null skb",
-                QLC_SIZEOF(stats.null_skb), QLC_OFF(stats.null_skb)},
         {"null rxbuf",
                 QLC_SIZEOF(stats.null_rxbuf), QLC_OFF(stats.null_rxbuf)},
         {"rx dma map error", QLC_SIZEOF(stats.rx_dma_map_error),
diff --git a/drivers/net/qlcnic/qlcnic_init.c b/drivers/net/qlcnic/qlcnic_init.c
index 058ce61501c..1c3d5a90d21 100644
--- a/drivers/net/qlcnic/qlcnic_init.c
+++ b/drivers/net/qlcnic/qlcnic_init.c
@@ -112,14 +112,15 @@ void qlcnic_release_rx_buffers(struct qlcnic_adapter *adapter)
                 rds_ring = &recv_ctx->rds_rings[ring];
                 for (i = 0; i < rds_ring->num_desc; ++i) {
                         rx_buf = &(rds_ring->rx_buf_arr[i]);
-                        if (rx_buf->state == QLCNIC_BUFFER_FREE)
+                        if (rx_buf->skb == NULL)
                                 continue;
+
                         pci_unmap_single(adapter->pdev,
                                         rx_buf->dma,
                                         rds_ring->dma_size,
                                         PCI_DMA_FROMDEVICE);
-                        if (rx_buf->skb != NULL)
-                                dev_kfree_skb_any(rx_buf->skb);
+
+                        dev_kfree_skb_any(rx_buf->skb);
                 }
         }
 }
@@ -266,7 +267,6 @@ int qlcnic_alloc_sw_resources(struct qlcnic_adapter *adapter)
                         list_add_tail(&rx_buf->list,
                                         &rds_ring->free_list);
                         rx_buf->ref_handle = i;
-                        rx_buf->state = QLCNIC_BUFFER_FREE;
                         rx_buf++;
                 }
                 spin_lock_init(&rds_ring->lock);
@@ -1281,14 +1281,12 @@ qlcnic_alloc_rx_skb(struct qlcnic_adapter *adapter,
         dma_addr_t dma;
         struct pci_dev *pdev = adapter->pdev;
 
-        buffer->skb = dev_alloc_skb(rds_ring->skb_size);
-        if (!buffer->skb) {
+        skb = dev_alloc_skb(rds_ring->skb_size);
+        if (!skb) {
                 adapter->stats.skb_alloc_failure++;
                 return -ENOMEM;
         }
 
-        skb = buffer->skb;
-
         skb_reserve(skb, 2);
 
         dma = pci_map_single(pdev, skb->data,
@@ -1297,13 +1295,11 @@ qlcnic_alloc_rx_skb(struct qlcnic_adapter *adapter,
         if (pci_dma_mapping_error(pdev, dma)) {
                 adapter->stats.rx_dma_map_error++;
                 dev_kfree_skb_any(skb);
-                buffer->skb = NULL;
                 return -ENOMEM;
         }
 
         buffer->skb = skb;
         buffer->dma = dma;
-        buffer->state = QLCNIC_BUFFER_BUSY;
 
         return 0;
 }
@@ -1316,14 +1312,15 @@ static struct sk_buff *qlcnic_process_rxbuf(struct qlcnic_adapter *adapter,
 
         buffer = &rds_ring->rx_buf_arr[index];
 
+        if (unlikely(buffer->skb == NULL)) {
+                WARN_ON(1);
+                return NULL;
+        }
+
         pci_unmap_single(adapter->pdev, buffer->dma, rds_ring->dma_size,
                         PCI_DMA_FROMDEVICE);
 
         skb = buffer->skb;
-        if (!skb) {
-                adapter->stats.null_skb++;
-                goto no_skb;
-        }
 
         if (likely(adapter->rx_csum && cksum == STATUS_CKSUM_OK)) {
                 adapter->stats.csummed++;
@@ -1335,8 +1332,7 @@ static struct sk_buff *qlcnic_process_rxbuf(struct qlcnic_adapter *adapter,
         skb->dev = adapter->netdev;
 
         buffer->skb = NULL;
-no_skb:
-        buffer->state = QLCNIC_BUFFER_FREE;
+
         return skb;
 }
 
@@ -1511,7 +1507,7 @@ qlcnic_process_rcv_ring(struct qlcnic_host_sds_ring *sds_ring, int max)
 
                 WARN_ON(desc_cnt > 1);
 
-                if (rxbuf)
+                if (likely(rxbuf))
                         list_add_tail(&rxbuf->list, &sds_ring->free_list[ring]);
                 else
                         adapter->stats.null_rxbuf++;