[PATCH V2 14/22] net-next: mediatek: fix off by one in the TX ring allocation
John Crispin
john at phrozen.org
Mon May 9 03:04:06 PDT 2016
The TX ring setup has an off by one error causing it to not utilise all
descriptors. This has the side effect that we need to reset the next
pointer at runtime to make it work. Fix the off by one and remove the
code fixing the ring at runtime.
Signed-off-by: John Crispin <john at phrozen.org>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 3ece159..9f4b533 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -921,7 +921,6 @@ static int mtk_poll_tx(struct mtk_eth *eth, int budget, bool *tx_again)
}
mtk_tx_unmap(eth->dev, tx_buf);
- ring->last_free->txd2 = next_cpu;
ring->last_free = desc;
atomic_inc(&ring->free_count);
@@ -1029,7 +1028,7 @@ static int mtk_tx_alloc(struct mtk_eth *eth)
atomic_set(&ring->free_count, MTK_DMA_SIZE - 2);
ring->next_free = &ring->dma[0];
- ring->last_free = &ring->dma[MTK_DMA_SIZE - 2];
+ ring->last_free = &ring->dma[MTK_DMA_SIZE - 1];
ring->thresh = MAX_SKB_FRAGS;
/* make sure that all changes to the dma ring are flushed before we
--
1.7.10.4
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