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| author | Shannon Nelson <shannon.nelson@oracle.com> | 2017-02-13 10:57:00 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-02-14 13:04:09 -0500 |
| commit | fd263fb6e718c5bdf35cbc1de4f781c71794d2a4 (patch) | |
| tree | 8569adf9d2f8d2ebc2db0fb5cd109127ec08d129 | |
| parent | f2f3e210bffe5c8f8b30d0b0c7b0f733ff5db334 (diff) | |
| download | cachepc-linux-fd263fb6e718c5bdf35cbc1de4f781c71794d2a4.tar.gz cachepc-linux-fd263fb6e718c5bdf35cbc1de4f781c71794d2a4.zip | |
sunvnet: add memory barrier before check for tx enable
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | 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 0f940f0e488d..623363bf08df 100644 --- a/drivers/net/ethernet/sun/sunvnet_common.c +++ b/drivers/net/ethernet/sun/sunvnet_common.c @@ -1427,6 +1427,7 @@ ldc_start_done: 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); } |