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net: mediatek: fix off by one in the TX ring allocation

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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@phrozen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Crispin 2016-06-10 13:28:06 +02:00 committed by David S. Miller
parent eaadf9fd3f
commit 12c97c13ea
1 changed files with 1 additions and 2 deletions
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3
drivers/net/ethernet/mediatek/mtk_eth_soc.c
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@ -926,7 +926,6 @@ 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);
@ -1032,7 +1031,7 @@ 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