linux-kernel - Re: mfd: Simulate active high IRQs with wm831x

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Date:	Wed, 21 Sep 2011 13:23:01 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Ian Lartey <ian@...nsource.wolfsonmicro.com>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: mfd: Simulate active high IRQs with wm831x

On Wed, Sep 21, 2011 at 09:44:15AM +0300, Dan Carpenter wrote:

>    518                  /* Simulate an edge triggered IRQ by polling the input
>    519                   * status.  This is sucky but improves interoperability.
>    520                   */
>    521                  if (primary == WM831X_GP_INT &&
>    522                      wm831x->gpio_level[i - WM831X_IRQ_GPIO_1]) {
>                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

> We're inside a for loop over ARRAY_SIZE(wm831x_irqs) which has 58
> elements (so "i" is 0-57) and we subtract WM831X_IRQ_GPIO_1 (1) which
> gives us a max of 56.  The ->gpio_level[] array only has 16 elements

> In wm831x_irq_set_type() it only sets the first 11 elements of the
> ->gpio_level[] array.  Perhaps something similar is needed here.  I
> don't know the code well enough to say.

There's no need for any additional checks, the check for the primary IRQ
ensures that we know we're dealing with a GPIO IRQ.
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