linux-kernel - [net-next,1/1] net: stmmac: Set OWN bit last in dwmac4_set_rx

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Message-Id: <20240809153138.1865681-1-ende.tan@starfivetech.com>
Date: Fri,  9 Aug 2024 23:31:38 +0800
From: ende.tan@...rfivetech.com
To: netdev@...r.kernel.org
Cc: alexandre.torgue@...s.st.com,
	joabreu@...opsys.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	mcoquelin.stm32@...il.com,
	linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	leyfoon.tan@...rfivetech.com,
	minda.chen@...rfivetech.com,
	Tan En De <ende.tan@...rfivetech.com>
Subject: [net-next,1/1] net: stmmac: Set OWN bit last in dwmac4_set_rx_owner()

From: Tan En De <ende.tan@...rfivetech.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@...rfivetech.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