mfd: Always initialise WM831x IRQ mutex

This avoids crashes when running without interrupt support.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
index d3015dfb9134..ac056ea6b66e 100644
--- a/drivers/mfd/wm831x-irq.c
+++ b/drivers/mfd/wm831x-irq.c
@@ -507,6 +507,8 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq)
 {
         int i, ret;
 
+        mutex_init(&wm831x->irq_lock);
+
         if (!irq) {
                 dev_warn(wm831x->dev,
                          "No interrupt specified - functionality limited\n");
@@ -521,7 +523,6 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq)
         }
 
         wm831x->irq = irq;
-        mutex_init(&wm831x->irq_lock);
         INIT_WORK(&wm831x->irq_work, wm831x_irq_worker);
 
         /* Mask the individual interrupt sources */