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Diffstat (limited to 'target/linux/mediatek/patches-4.4/0090-net-next-mediatek-fix-off-by-one-in-the-TX-ring-allo.patch')
-rw-r--r--target/linux/mediatek/patches-4.4/0090-net-next-mediatek-fix-off-by-one-in-the-TX-ring-allo.patch41
1 files changed, 41 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches-4.4/0090-net-next-mediatek-fix-off-by-one-in-the-TX-ring-allo.patch b/target/linux/mediatek/patches-4.4/0090-net-next-mediatek-fix-off-by-one-in-the-TX-ring-allo.patch
new file mode 100644
index 0000000000..7a58bfb3e4
--- /dev/null
+++ b/target/linux/mediatek/patches-4.4/0090-net-next-mediatek-fix-off-by-one-in-the-TX-ring-allo.patch
@@ -0,0 +1,41 @@
+From 94425de9ede5ef0eafbfced65140c30e7c0b6c0d Mon Sep 17 00:00:00 2001
+From: John Crispin <john@phrozen.org>
+Date: Tue, 3 May 2016 03:01:13 +0200
+Subject: [PATCH 090/102] net-next: mediatek: fix off by one in the TX ring
+ allocation
+
+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: Sean Wang <keyhaede@gmail.com>
+Signed-off-by: John Crispin <john@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 52cdb3a..87b48c0 100644
+--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+@@ -934,7 +934,6 @@ 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);
+
+@@ -1042,7 +1041,7 @@ 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
+