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37 lines
1.3 KiB
Diff
37 lines
1.3 KiB
Diff
From 94425de9ede5ef0eafbfced65140c30e7c0b6c0d Mon Sep 17 00:00:00 2001
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From: John Crispin <john@phrozen.org>
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Date: Tue, 3 May 2016 03:01:13 +0200
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Subject: [PATCH 090/102] net-next: mediatek: fix off by one in the TX ring
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allocation
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The TX ring setup has an off by one error causing it to not utilise all
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descriptors. This has the side effect that we need to reset the next
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pointer at runtime to make it work. Fix the off by one and remove the
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code fixing the ring at runtime.
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Signed-off-by: Sean Wang <keyhaede@gmail.com>
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Signed-off-by: John Crispin <john@phrozen.org>
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---
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drivers/net/ethernet/mediatek/mtk_eth_soc.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
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+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
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@@ -934,7 +934,6 @@ static int mtk_poll_tx(struct mtk_eth *e
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}
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mtk_tx_unmap(eth->dev, tx_buf);
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- ring->last_free->txd2 = next_cpu;
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ring->last_free = desc;
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atomic_inc(&ring->free_count);
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@@ -1042,7 +1041,7 @@ static int mtk_tx_alloc(struct mtk_eth *
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atomic_set(&ring->free_count, MTK_DMA_SIZE - 2);
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ring->next_free = &ring->dma[0];
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- ring->last_free = &ring->dma[MTK_DMA_SIZE - 2];
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+ ring->last_free = &ring->dma[MTK_DMA_SIZE - 1];
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ring->thresh = MAX_SKB_FRAGS;
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/* make sure that all changes to the dma ring are flushed before we
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