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From: Jon Hunter <jonathanh@nvidia.com>
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>
Subject: Re: [PATCH net-next 3/3] net: stmmac: Convert to phylink and remove phylib logic
Date: Tue, 18 Jun 2019 20:44:10 +0100
Message-ID: <6f36b6b6-8209-ed98-e7e1-3dac0a92f6cd@nvidia.com> (raw)
In-Reply-To: <d96f8bea-f7ef-82ae-01ba-9c97aec0ee38@nvidia.com>


On 18/06/2019 16:20, Jon Hunter wrote:
> 
> On 18/06/2019 11:18, Jon Hunter wrote:
>>
>> 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);
>> +               }
>>         }
>>  }
> 
> So good news and bad news ...
> 
> The good news is that the above change does fix the initial crash
> I am seeing. However, even with this change applied on top of
> -next, it is still dying somewhere else and so there appears to
> be a second issue. 

Further testing has shown that actually this does NOT resolve the issue
and I am still seeing the crash. Sorry for the false-positive.

Jon

-- 
nvpublic

  reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-11 15:18 [PATCH net-next 0/3] net: stmmac: Convert to phylink Jose Abreu
2019-06-11 15:18 ` [PATCH net-next 1/3] net: stmmac: Prepare to convert " Jose Abreu
2019-06-11 15:18 ` [PATCH net-next 2/3] net: stmmac: Start adding phylink support Jose Abreu
2019-06-11 15:35   ` Russell King - ARM Linux admin
2019-06-11 15:40     ` Jose Abreu
2019-06-11 15:18 ` [PATCH net-next 3/3] net: stmmac: Convert to phylink and remove phylib logic Jose Abreu
2019-06-18  9:30   ` Jon Hunter
2019-06-18  9:35     ` Jose Abreu
2019-06-18  9:42       ` Jon Hunter
2019-06-18  9:46         ` Jose Abreu
2019-06-18 10:18           ` Jon Hunter
2019-06-18 15:20             ` Jon Hunter
2019-06-18 19:44               ` Jon Hunter [this message]
2019-06-20 14:05                 ` Jon Hunter
2019-06-25  7:37                   ` Jose Abreu
2019-06-25 11:10                     ` Jon Hunter
2019-06-25 11:25                       ` Jose Abreu
2019-06-13 21:02 ` [PATCH net-next 0/3] net: stmmac: Convert to phylink David Miller
2019-06-14 13:40 ` Corentin Labbe
2019-06-14 14:45   ` Jose Abreu
2019-07-22 12:42 ` Ondřej Jirman
2019-07-22 13:28   ` Jose Abreu
2019-07-22 13:40     ` Andrew Lunn
2019-07-22 13:58       ` Jose Abreu
2019-07-22 14:19         ` Andrew Lunn
2019-07-22 14:26           ` Jose Abreu
2019-07-22 14:39             ` Ondřej Jirman
2019-07-23  9:36               ` Jose Abreu
2019-07-22 13:49     ` Ondřej Jirman

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