netdev - Re: [PATCH v3 net-next 04/15] net: aquantia: link interrupt handling function

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Date:   Sat, 27 Apr 2019 06:10:23 +0000
From:   Igor Russkikh <Igor.Russkikh@...antia.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "David S . Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Nikita Danilov <Nikita.Danilov@...antia.com>,
        Dmitry Bogdanov <Dmitry.Bogdanov@...antia.com>
Subject: Re: [PATCH v3 net-next 04/15] net: aquantia: link interrupt handling
 function


>> +static irqreturn_t aq_linkstate_threaded_isr(int irq, void *private)
>> +{
>> +	struct aq_nic_s *self = private;
>> +
>> +	if (!self)
>> +		return IRQ_NONE;
>> +
>> +	aq_nic_update_link_status(self);
>> +
>> +	self->aq_hw_ops->hw_irq_enable(self->aq_hw,
>> +				       BIT(self->aq_nic_cfg.link_irq_vec));
> 
> So does this mean the hardware disables interrupts when they fire?  Is
> this an ack, not an enable?

Right, hw has a feature of interrupts automasking on trigger.
This is essentially an unmasking operation.

> Can you loose interrupts this way? Or are the internally level
> interrupts, so it could immediately fire again if the source has not
> been services?

Pending masked ISR will trigger as soon as we enable it again.
So it won't be lost.

Regards,
  Igor