diff options
| author | Doug Berger <opendmb@gmail.com> | 2017-03-13 17:41:33 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-13 21:51:49 -0700 |
| commit | c298ede2fe21e034ab6ba4f15340fadc03ae9663 (patch) | |
| tree | 8201f36ecb488e401e01e8a3cdd52f1149aaa891 | |
| parent | 83ee102a6998f808ac4c626e8f72344f0a355527 (diff) | |
| download | linux-c298ede2fe21e034ab6ba4f15340fadc03ae9663.tar.bz2 | |
net: bcmgenet: simplify circular pointer arithmetic
A 2's complement subtraction will always do a borrow, so masking
off the sign bits is the same as conditionally adding (mask+1).
Signed-off-by: Doug Berger <opendmb@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/broadcom/genet/bcmgenet.c | 19 |
1 files changed, 5 insertions, 14 deletions
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c index f92896835d2a..2c008b09c4e3 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c @@ -1,7 +1,7 @@ /* * Broadcom GENET (Gigabit Ethernet) controller driver * - * Copyright (c) 2014 Broadcom Corporation + * Copyright (c) 2014-2017 Broadcom * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -1175,13 +1175,9 @@ static unsigned int __bcmgenet_tx_reclaim(struct net_device *dev, unsigned int txbds_processed = 0; /* Compute how many buffers are transmitted since last xmit call */ - c_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_CONS_INDEX); - c_index &= DMA_C_INDEX_MASK; - - if (likely(c_index >= ring->c_index)) - txbds_ready = c_index - ring->c_index; - else - txbds_ready = (DMA_C_INDEX_MASK + 1) - ring->c_index + c_index; + c_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_CONS_INDEX) + & DMA_C_INDEX_MASK; + txbds_ready = (c_index - ring->c_index) & DMA_C_INDEX_MASK; netif_dbg(priv, tx_done, dev, "%s ring=%d old_c_index=%u c_index=%u txbds_ready=%u\n", @@ -1611,12 +1607,7 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring, } p_index &= DMA_P_INDEX_MASK; - - if (likely(p_index >= ring->c_index)) - rxpkttoprocess = p_index - ring->c_index; - else - rxpkttoprocess = (DMA_C_INDEX_MASK + 1) - ring->c_index + - p_index; + rxpkttoprocess = (p_index - ring->c_index) & DMA_C_INDEX_MASK; netif_dbg(priv, rx_status, dev, "RDMA: rxpkttoprocess=%d\n", rxpkttoprocess); |