diff options
Diffstat (limited to 'drivers/net/ethernet/hisilicon/hns3/hns3_enet.h')
| -rw-r--r-- | drivers/net/ethernet/hisilicon/hns3/hns3_enet.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h index cec56a505e85..2b4f5ea3fddf 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h @@ -581,8 +581,11 @@ union l4_hdr_info { static inline int ring_space(struct hns3_enet_ring *ring) { - int begin = ring->next_to_clean; - int end = ring->next_to_use; + /* This smp_load_acquire() pairs with smp_store_release() in + * hns3_nic_reclaim_one_desc called by hns3_clean_tx_ring. + */ + int begin = smp_load_acquire(&ring->next_to_clean); + int end = READ_ONCE(ring->next_to_use); return ((end >= begin) ? (ring->desc_num - end + begin) : (begin - end)) - 1; |