[PATCH] kernel/irq: Reset IRQ desc->depth to 1 when __free_irq disables the line

[Shmulik Ladkani <shmulik.ladkani@gmail.com>]

Reset irq_desc's depth field to 1, indicating IRQ line is disabled, when
__free_irq disables/shuts-down the line (i.e. upon unregistration of
last interrupt handler).

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
---
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index eb6078c..642a98c 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -877,6 +877,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
 
 	/* If this was the last handler, shut down the IRQ line: */
 	if (!desc->action) {
+		desc->depth = 1;
 		desc->status |= IRQ_DISABLED;
 		if (desc->chip->shutdown)
 			desc->chip->shutdown(irq);
-- 
Shmulik Ladkani