linux-kernel - Re: [PATCH v2] pinctrl: baytrail: lock IRQs when starting them

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Message-ID: <20131204132613.GD2982@book.gsilab.sittig.org>
Date:	Wed, 4 Dec 2013 14:26:13 +0100
From:	Gerhard Sittig <gsi@...x.de>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Stephen Warren <swarren@...dia.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: Re: [PATCH v2] pinctrl: baytrail: lock IRQs when starting them

On Tue, Dec 03, 2013 at 16:00 +0100, Linus Walleij wrote:
> 
> --- a/drivers/pinctrl/pinctrl-baytrail.c
> +++ b/drivers/pinctrl/pinctrl-baytrail.c
> @@ -372,11 +372,33 @@ static void byt_irq_mask(struct irq_data *d)
>  {
>  }
>  
> +static unsigned int byt_irq_startup(struct irq_data *d)
> +{
> +	struct byt_gpio *vg = irq_data_get_irq_handler_data(d);
> +
> +	if (gpio_lock_as_irq(&vg->chip, irqd_to_hwirq(d)))
> +		dev_err(vg->chip.dev,
> +			"unable to lock HW IRQ %lu for IRQ\n",
> +			irqd_to_hwirq(d));
> +	byt_irq_unmask(d);
> +	return 0;
> +}

Just a thought:  If failure to lock is non-fatal, should the
message be a warning then?

I do agree that failure to lock the GPIO should be non-fatal, as
there was debate and still might be concerns about how strict
locking should be.


virtually yours
Gerhard Sittig
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