On Tue, 21 Oct 2014, Oleksij Rempel wrote:

 static void icoll_unmask_irq(struct irq_data *d)
 {
-	__raw_writel(BM_ICOLL_INTR_ENABLE,
-			icoll_priv.intr + SET_REG + HW_ICOLL_INTERRUPTn(d->hwirq));
+	mutex_lock(&icoll_lock);

And how's that supposed to work? You certainly did not run this code
with even the simplest debugging options enabled. Not to talk about
lockdep or such.

Thanks,

	tglx