[PATCH] mfd: Fix off by one in WM831x IRQ code

[Mark Brown <broonie@opensource.wolfsonmicro.com>]

From: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>

The GPIO IRQs aren't the first IRQs defined, we need to subtract the base
for the GPIOs as well to use them for array indexes.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
 drivers/mfd/wm831x-irq.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
index 1808deb..6c3408c 100644
--- a/drivers/mfd/wm831x-irq.c
+++ b/drivers/mfd/wm831x-irq.c
@@ -408,6 +408,11 @@ static int wm831x_irq_set_type(struct irq_data *data, unsigned int type)
 			return -EINVAL;
 	}
 
+	/* Rebase the IRQ into the GPIO range so we've got a sensible array
+	 * index.
+	 */
+	irq -= WM831X_IRQ_GPIO_1;
+
 	/* We set the high bit to flag that we need an update; don't
 	 * do the update here as we can be called with the bus lock
 	 * held.
-- 
1.7.5.4