kernel/irq/irqdomain.c: before use 'irq_data', need check it whether …

…valid. Since irq_data may be NULL, if so, we WARN_ON(), and continue, 'hwirq' which related with 'irq_data' has to initialize later, or it will cause issue. Signed-off-by: Chen Gang <[email protected]> Signed-off-by: Grant Likely <[email protected]>
klaby · Jun 8, 2013 · 275e31b · 275e31b
1 parent 346dbb7
commit 275e31b
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
@@ -398,11 +398,12 @@ static void irq_domain_disassociate_many(struct irq_domain *domain,
 	while (count--) {
 		int irq = irq_base + count;
 		struct irq_data *irq_data = irq_get_irq_data(irq);
-		irq_hw_number_t hwirq = irq_data->hwirq;
+		irq_hw_number_t hwirq;
 
 		if (WARN_ON(!irq_data || irq_data->domain != domain))
 			continue;
 
+		hwirq = irq_data->hwirq;
 		irq_set_status_flags(irq, IRQ_NOREQUEST);
 
 		/* remove chip and handler */