Messages in this thread Patch in this message | | | From | Shannon Nelson <> | Subject | [PATCH v4 net-next 4/8] sunvnet: add memory barrier before check for tx enable | Date | Mon, 13 Feb 2017 10:57:00 -0800 |
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In order to allow the underlying LDC and outstanding memory operations to potentially catch up with the driver's Tx requests, add a memory barrier before checking again for available tx descriptors.
Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com> --- drivers/net/ethernet/sun/sunvnet_common.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/drivers/net/ethernet/sun/sunvnet_common.c b/drivers/net/ethernet/sun/sunvnet_common.c index 0f940f0..623363b 100644 --- a/drivers/net/ethernet/sun/sunvnet_common.c +++ b/drivers/net/ethernet/sun/sunvnet_common.c @@ -1427,6 +1427,7 @@ int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev, dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); if (unlikely(vnet_tx_dring_avail(dr) < 1)) { netif_tx_stop_queue(txq); + smp_rmb(); if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) netif_tx_wake_queue(txq); } -- 1.7.1
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