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net: systemport: Simplify circular pointer arithmetic 

Similar to c298ede2fe ("net: bcmgenet: simplify circular pointer
arithmetic") we don't need to complex arthimetic since we always have a
ring size that is a power of 2.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2017-03-23 10:36:48 -07:00 committed by David S. Miller
parent 6baa785a9c
commit e9d7af78b2
1 changed files with 1 additions and 5 deletions
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6
drivers/net/ethernet/broadcom/bcmsysport.c
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@ -682,11 +682,7 @@ static unsigned int bcm_sysport_desc_rx(struct bcm_sysport_priv *priv,
p_index = rdma_readl(priv, RDMA_CONS_INDEX);
p_index &= RDMA_PROD_INDEX_MASK;
if (p_index < priv->rx_c_index)
to_process = (RDMA_CONS_INDEX_MASK + 1) -
priv->rx_c_index + p_index;
else
to_process = p_index - priv->rx_c_index;
to_process = (p_index - priv->rx_c_index) & RDMA_CONS_INDEX_MASK;
netif_dbg(priv, rx_status, ndev,
"p_index=%d rx_c_index=%d to_process=%d\n",