[PATCH 1/1] qlcnic: add wmb() call in transmit data path.
From: Sony Chacko <hidden>
Date: 2016-06-29 23:04:43
Subsystem:
networking drivers, qlogic qlcnic (1/10)gb ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Shahed Shaikh, Manish Chopra, Linus Torvalds
Call wmb() to ensure writes are complete before hardware fetches updated Tx descriptors. Signed-off-by: Sony Chacko <redacted> --- drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
index 607bb7d..87c642d 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c@@ -772,6 +772,8 @@ netdev_tx_t qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) tx_ring->tx_stats.tx_bytes += skb->len; tx_ring->tx_stats.xmit_called++; + /* Ensure writes are complete before HW fetches Tx descriptors */ + wmb(); qlcnic_update_cmd_producer(tx_ring); return NETDEV_TX_OK;
--
1.7.1