net: axienet: Fix compilation warnings

Warning log:
xilinx_axienet_main.c: In function 'axienet_start_xmit_done':
xilinx_axienet_main.c:617:16: warning: operation on 'lp->tx_bd_ci' may be undefined [-Wsequence-point]
xilinx_axienet_main.c: In function 'axienet_start_xmit':
xilinx_axienet_main.c:703:18: warning: operation on 'lp->tx_bd_tail' may be undefined [-Wsequence-point]
xilinx_axienet_main.c:719:17: warning: operation on 'lp->tx_bd_tail' may be undefined [-Wsequence-point]
xilinx_axienet_main.c: In function 'axienet_recv':
xilinx_axienet_main.c:792:16: warning: operation on 'lp->rx_bd_ci' may be undefined [-Wsequence-point]
xilinx_axienet_main.c: In function 'axienet_of_probe':
xilinx_axienet_main.c:1501:21: warning: unused variable 'rc' [-Wunused-variable]

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 9fb8ab2..4bfdf8c 100644 (file)
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -601,7 +601,8 @@ static void axienet_start_xmit_done(struct net_device *ndev)
                size += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
                packets++;
 
-               lp->tx_bd_ci = ++lp->tx_bd_ci % TX_BD_NUM;
+               ++lp->tx_bd_ci;
+               lp->tx_bd_ci %= TX_BD_NUM;
                cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
                status = cur_p->status;
        }
@@ -687,7 +688,8 @@ static int axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
                                     skb_headlen(skb), DMA_TO_DEVICE);
 
        for (ii = 0; ii < num_frag; ii++) {
-               lp->tx_bd_tail = ++lp->tx_bd_tail % TX_BD_NUM;
+               ++lp->tx_bd_tail;
+               lp->tx_bd_tail %= TX_BD_NUM;
                cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
                frag = &skb_shinfo(skb)->frags[ii];
                cur_p->phys = dma_map_single(ndev->dev.parent,
@@ -703,7 +705,8 @@ static int axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
        tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
        /* Start the transfer */
        axienet_dma_out32(lp, XAXIDMA_TX_TDESC_OFFSET, tail_p);
-       lp->tx_bd_tail = ++lp->tx_bd_tail % TX_BD_NUM;
+       ++lp->tx_bd_tail;
+       lp->tx_bd_tail %= TX_BD_NUM;
 
        return NETDEV_TX_OK;
 }
@@ -775,7 +778,8 @@ static void axienet_recv(struct net_device *ndev)
                cur_p->status = 0;
                cur_p->sw_id_offset = (u32) new_skb;
 
-               lp->rx_bd_ci = ++lp->rx_bd_ci % RX_BD_NUM;
+               ++lp->rx_bd_ci;
+               lp->rx_bd_ci %= RX_BD_NUM;
                cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
        }