Subject: Re: [PATCH v4] flexcan: add err_irq handler for flexcan

From: Marc Kleine-Budde <[email-masked]>
Date: Wed, 02 Jul 2014 09:04:12 +0200

On 07/02/2014 04:00 AM, [email-masked] wrote:
>>> +static irqreturn_t flexcan_err_irq(int irq, void *dev_id) {
>>> +	struct net_device *dev = dev_id;
>>> +	struct flexcan_priv *priv = netdev_priv(dev);
>>> +	struct flexcan_regs __iomem *regs = priv->base;
>>> +	u32 reg_ctrl, reg_esr;
>>> +
>>> +	reg_esr = flexcan_read(&regs->esr);
>>> +	reg_ctrl = flexcan_read(&regs->ctrl);
>>> +
>>> +	if (reg_esr & FLEXCAN_ESR_ALL_INT) {
>>> +		if (reg_esr & FLEXCAN_ESR_ERR_INT)
>>> +			flexcan_write(reg_ctrl & ~FLEXCAN_CTRL_ERR_MSK,
>>> +				      &regs->ctrl);
>>> +		flexcan_irq(irq, dev);
>>
>> I still don't understand why you need a special flexcan_err_irq()
>> function. Why don't you just call:
>>
>> request_irq(priv->err_irq, flexcan_irq, IRQF_SHARED, dev->name, dev);
>>
>> instead?
> 
> Flexcan_irq is for flexcan normal interrupt(such as Message Buffer, Wake up and so on).
> And it will return IRQ_HANDLED if flexcan_irq is triggered.
> But err_irq is shared with other devices, it should return IRQ_HANDLED when the interrupt 
> is triggered by flexcan device, if not return IRQ_NONE.

What about fixing flexcan_irq() first and the make use of it?

Marc

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