net: mediatek: fix TX locking

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Inside the TX path there is a lock inside the tx_map function. This is
however too late. The patch moves the lock to the start of the xmit
function right before the free count check of the DMA ring happens.
If we do not do this, the code becomes racy leading to TX stalls and
dropped packets. This happens as there are 2 netdevs running on the
same physical DMA ring.

Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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John Crispin 2016-04-08 00:54:08 +02:00 • committed by David S. Miller

parent 13c822f6d4

commit 34c2e4c9e9

1 changed files with 10 additions and 10 deletions

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drivers/net/ethernet/mediatek/mtk_eth_soc.c

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