Check the return value chip of irq_data_get_irq_chip(), which could be
NULL and result in null pointer dereference if unchecked.

Signed-off-by: Li Zhong <floridsleeves@gmail.com>
---
 kernel/irq/manage.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 40fe7806cc8c..1f967050338b 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -202,6 +202,8 @@ static void irq_validate_effective_affinity(struct irq_data *data)
 
 	if (!cpumask_empty(m))
 		return;
+	if (!chip)
+		return;
 	pr_warn_once("irq_chip %s did not update eff. affinity mask of irq %u\n",
 		     chip->name, data->irq);
 }
-- 
2.25.1