netdev - Re: [PATCH v6 net-next 07/19] ionic: Add basic adminq support

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Date:   Fri, 30 Aug 2019 12:31:07 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH v6 net-next 07/19] ionic: Add basic adminq support

On 8/29/19 3:52 PM, Jakub Kicinski wrote:
> On Thu, 29 Aug 2019 11:27:08 -0700, Shannon Nelson wrote:
>> +static void ionic_lif_qcq_deinit(struct ionic_lif *lif, struct ionic_qcq *qcq)
>> +{
>> +	struct ionic_dev *idev = &lif->ionic->idev;
>> +	struct device *dev = lif->ionic->dev;
>> +
>> +	if (!qcq)
>> +		return;
>> +
>> +	ionic_debugfs_del_qcq(qcq);
>> +
>> +	if (!(qcq->flags & IONIC_QCQ_F_INITED))
>> +		return;
>> +
>> +	if (qcq->flags & IONIC_QCQ_F_INTR) {
>> +		ionic_intr_mask(idev->intr_ctrl, qcq->intr.index,
>> +				IONIC_INTR_MASK_SET);
>> +		synchronize_irq(qcq->intr.vector);
>> +		devm_free_irq(dev, qcq->intr.vector, &qcq->napi);
> Doesn't free_irq() basically imply synchronize_irq()?

The synchronize_irq() waits for any threaded handlers to finish, while 
free_irq() only waits for HW handling.  This helps makes sure we don't 
have anything still running before we remove resources.

sln

>
>> +		netif_napi_del(&qcq->napi);
>> +	}
>> +
>> +	qcq->flags &= ~IONIC_QCQ_F_INITED;