From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jon Hunter <jonathanh@nvidia.com>
Subject: Re: [PATCH net-next 3/3] net: stmmac: Convert to phylink and remove
 phylib logic
Date: Tue, 18 Jun 2019 11:18:53 +0100
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To: Jose Abreu <Jose.Abreu@synopsys.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "netdev@vger.kernel.org" <netdev@vger.kernel.org>
Cc: Joao Pinto <Joao.Pinto@synopsys.com>, "David S . Miller" <davem@davemloft.net>, Giuseppe Cavallaro <peppe.cavallaro@st.com>, Alexandre Torgue <alexandre.torgue@st.com>, Russell King <linux@armlinux.org.uk>, Andrew Lunn <andrew@lunn.ch>, Florian Fainelli <f.fainelli@gmail.com>, Heiner Kallweit <hkallweit1@gmail.com>, linux-tegra <linux-tegra@vger.kernel.org>
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On 18/06/2019 10:46, Jose Abreu wrote:
> From: Jon Hunter <jonathanh@nvidia.com>
> 
>> I am not certain but I don't believe so. We are using a static IP address
>> and mounting the root file-system via NFS when we see this ...
> 
> Can you please add a call to napi_synchronize() before every 
> napi_disable() calls, like this:
> 
> if (queue < rx_queues_cnt) {
> 	napi_synchronize(&ch->rx_napi);
> 	napi_disable(&ch->rx_napi);
> }
> 
> if (queue < tx_queues_cnt) {
> 	napi_synchronize(&ch->tx_napi);
> 	napi_disable(&ch->tx_napi);
> }
> 
> [ I can send you a patch if you prefer ]

Yes I can try this and for completeness you mean ...

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 4ca46289a742..d4a12cb64d8e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -146,10 +146,15 @@ static void stmmac_disable_all_queues(struct stmmac_priv *priv)
        for (queue = 0; queue < maxq; queue++) {
                struct stmmac_channel *ch = &priv->channel[queue];
 
-               if (queue < rx_queues_cnt)
+               if (queue < rx_queues_cnt) {
+                       napi_synchronize(&ch->rx_napi);
                        napi_disable(&ch->rx_napi);
-               if (queue < tx_queues_cnt)
+               }
+
+               if (queue < tx_queues_cnt) {
+                       napi_synchronize(&ch->tx_napi);
                        napi_disable(&ch->tx_napi);
+               }
        }
 }

Cheers
Jon

-- 
nvpublic