[net-next,1/1] net: stmmac: Set OWN bit last in dwmac4_set_rx_owner()

[net-next,1/1] net: stmmac: Set OWN bit last in dwmac4_set_rx_owner()

[ende.tan]

From: Tan En De <ende.tan@starfivetech.com>

Ensure that all other bits in the RDES3 descriptor are configured before
transferring ownership of the descriptor to DMA via the OWN bit.

Signed-off-by: Tan En De <ende.tan@starfivetech.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
index 1c5802e0d7f4..95aea6ad485b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
@@ -186,10 +186,13 @@ static void dwmac4_set_tx_owner(struct dma_desc *p)
 
 static void dwmac4_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
 {
-	p->des3 |= cpu_to_le32(RDES3_OWN | RDES3_BUFFER1_VALID_ADDR);
+	p->des3 |= cpu_to_le32(RDES3_BUFFER1_VALID_ADDR);
 
 	if (!disable_rx_ic)
 		p->des3 |= cpu_to_le32(RDES3_INT_ON_COMPLETION_EN);
+
+	dma_wmb();
+	p->des3 |= cpu_to_le32(RDES3_OWN);
 }
 
 static int dwmac4_get_tx_ls(struct dma_desc *p)
-- 
2.34.1

Re: [net-next,1/1] net: stmmac: Set OWN bit last in dwmac4_set_rx_owner()

[Andrew Lunn]

On Fri, Aug 09, 2024 at 11:31:38PM +0800, ende.tan@starfivetech.com wrote:
> From: Tan En De <ende.tan@starfivetech.com>
> 
> Ensure that all other bits in the RDES3 descriptor are configured before
> transferring ownership of the descriptor to DMA via the OWN bit.

Please leave at least 24 hours between versions. If you notice
something wrong with your own patch, please reply to it and point out
the problem. And then wait the needed 24 hours before posting a new
version.

Also, this should be v2, and you should include under the --- how this
version is different to v1.

    Andrew

---
pw-bot: cr