the tx-poll command may advance the tx descriptor due the HW design.
By adding a pseudo read and proper memory barrier, we can ensure all the
data are ready before TX poll command.
Fixes: 52c0cae87465 ("ftgmac100: Remove tx descriptor accessors")
Signed-off-by: Dylan Hung <dylan_h...@aspeedtech.com>
Signed-off-by: Joel Stanley <j...@jms.id.au>
---
drivers/net/ethernet/faraday/ftgmac100.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/faraday/ftgmac100.c
b/drivers/net/ethernet/faraday/ftgmac100.c
index 7cacbe4aecb7..810bda80f138 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -814,8 +814,8 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff
*skb,
* before setting the OWN bit on the first descriptor.
*/
dma_wmb();
- first->txdes0 = cpu_to_le32(f_ctl_stat);
-
+ WRITE_ONCE(first->txdes0, cpu_to_le32(f_ctl_stat));
+ READ_ONCE(first->txdes0);
/* Update next TX pointer */
priv->tx_pointer = pointer;
--
2.17.1
