linux-kernel - Re: [PATCH RESEND] gpio: add MSIC gpio driver

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Date:	Tue, 10 Apr 2012 14:10:56 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	grant.likely@...retlab.ca, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] gpio: add MSIC gpio driver

On Tue, Apr 10, 2012 at 02:18:04PM +0100, Alan Cox wrote:

> +	if (mg->trig_change_mask) {
> +		offset = __ffs(mg->trig_change_mask);
> +
> +		reg = msic_gpio_to_ireg(offset);
> +		if (reg < 0)
> +			goto out;
> +
> +		if (mg->trig_type & IRQ_TYPE_EDGE_RISING)
> +			trig |= MSIC_GPIO_TRIG_RISE;
> +		if (mg->trig_type & IRQ_TYPE_EDGE_FALLING)
> +			trig |= MSIC_GPIO_TRIG_FALL;
> +
> +		intel_msic_reg_update(reg, trig, MSIC_GPIO_INTCNT_MASK);
> +		mg->trig_change_mask = 0;
> +	}

What happens if we manage to get more than one change flagged while the
lock is held?

> +/* Firmware does all the masking and unmasking for us, no masking here. */
> +static void msic_irq_unmask(struct irq_data *data) { }

> +static void msic_irq_mask(struct irq_data *data) { }

Shouldn't these just be omitted if they don't do anything (or
alternatively, how does the firmware figure out that it needs to do the
masking and unmasking)?

> +	mg = kzalloc(sizeof(*mg), GFP_KERNEL);
> +	if (!mg)
> +		return -ENOMEM;

devm_kzalloc()
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