netdev - Re: [PATCH 2/2] net/smsc911x: Move interrupt allocation to open/stop

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Date:   Thu, 1 Sep 2016 13:47:44 -0500
From:   Jeremy Linton <jeremy.linton@....com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, steve.glendinning@...well.net,
        sergei.shtylyov@...entembedded.com
Subject: Re: [PATCH 2/2] net/smsc911x: Move interrupt allocation to open/stop

Hi Andrew,

	Thanks for taking a look at this!

On 09/01/2016 12:06 PM, Andrew Lunn wrote:
> Hi Jeremy
>
> Please don't add forward references. Move the function earlier in the
> file.

Ok, but I thought it was a fairly large move due to further dependent 
functions..

>
>>  static inline u32 __smsc911x_reg_read(struct smsc911x_data *pdata, u32 reg)
>>  {
>>  	if (pdata->config.flags & SMSC911X_USE_32BIT)
>> @@ -1514,6 +1516,7 @@ static int smsc911x_open(struct net_device *dev)
>>  	unsigned int temp;
>>  	unsigned int intcfg;
>>  	int retval;
>> +	int irq_flags;
>>
>>  	/* find and start the given phy */
>>  	if (!dev->phydev) {
>> @@ -1584,6 +1587,14 @@ static int smsc911x_open(struct net_device *dev)
>>  	pdata->software_irq_signal = 0;
>>  	smp_wmb();
>>
>> +	irq_flags = irq_get_trigger_type(dev->irq);
>> +	if (request_irq(dev->irq, smsc911x_irqhandler,
>> +			irq_flags | IRQF_SHARED, dev->name, dev)) {
>> +		SMSC_WARN(pdata, probe,
>> +			  "Unable to claim requested irq: %d", dev->irq);
>> +		goto mii_free_out;
>> +	}
>> +
>>  	temp = smsc911x_reg_read(pdata, INT_EN);
>>  	temp |= INT_EN_SW_INT_EN_;
>>  	smsc911x_reg_write(pdata, INT_EN, temp);
>> @@ -1599,7 +1610,7 @@ static int smsc911x_open(struct net_device *dev)
>>  		netdev_warn(dev, "ISR failed signaling test (IRQ %d)\n",
>>  			    dev->irq);
>>  		retval = -ENODEV;
>> -		goto mii_free_out;
>> +		goto irq_stop_out;
>>  	}
>>  	SMSC_TRACE(pdata, ifup, "IRQ handler passed test using IRQ %d",
>>  		   dev->irq);
>> @@ -1645,7 +1656,8 @@ static int smsc911x_open(struct net_device *dev)
>>
>>  	netif_start_queue(dev);
>>  	return 0;
>> -
>> +irq_stop_out:
>> +	free_irq(dev->irq, dev);
>>  mii_free_out:
>>  	phy_disconnect(dev->phydev);
>>  	dev->phydev = NULL;
>> @@ -1672,12 +1684,15 @@ static int smsc911x_stop(struct net_device *dev)
>>  	dev->stats.rx_dropped += smsc911x_reg_read(pdata, RX_DROP);
>>  	smsc911x_tx_update_txcounters(dev);
>>
>> +	free_irq(dev->irq, dev);
>> +
>>  	/* Bring the PHY down */
>>  	if (dev->phydev) {
>>  		phy_stop(dev->phydev);
>>  		phy_disconnect(dev->phydev);
>>  		dev->phydev = NULL;
>>  	}
>> +	netif_carrier_off(dev);
>
> What has this change got to do with interrupt handling?

	This is a whoops, it should be in the previous patch..

>
>> @@ -2479,38 +2491,18 @@ static int smsc911x_drv_probe(struct platform_device *pdev)
>>  	if (retval < 0)
>>  		goto out_disable_resources;
>>
>> -	/* configure irq polarity and type before connecting isr */
>> -	if (pdata->config.irq_polarity == SMSC911X_IRQ_POLARITY_ACTIVE_HIGH)
>> -		intcfg |= INT_CFG_IRQ_POL_;
>> -
>> -	if (pdata->config.irq_type == SMSC911X_IRQ_TYPE_PUSH_PULL)
>> -		intcfg |= INT_CFG_IRQ_TYPE_;
>> -
>> -	smsc911x_reg_write(pdata, INT_CFG, intcfg);
>
>
> I see these removes, but where are the adds?


	The functionality is duplicated in open, when the IRQ handler is tested.