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-rw-r--r--kernel/irq/manage.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 3f9cd4799da7..2e9425889fa8 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -883,6 +883,8 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
if (desc->irq_data.chip == &no_irq_chip)
return -ENOSYS;
+ if (!try_module_get(desc->owner))
+ return -ENODEV;
/*
* Some drivers like serial.c use request_irq() heavily,
* so we have to be careful not to interfere with a
@@ -906,8 +908,10 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
*/
nested = irq_settings_is_nested_thread(desc);
if (nested) {
- if (!new->thread_fn)
- return -EINVAL;
+ if (!new->thread_fn) {
+ ret = -EINVAL;
+ goto out_mput;
+ }
/*
* Replace the primary handler which was provided from
* the driver for non nested interrupt handling by the
@@ -929,8 +933,10 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
t = kthread_create(irq_thread, new, "irq/%d-%s", irq,
new->name);
- if (IS_ERR(t))
- return PTR_ERR(t);
+ if (IS_ERR(t)) {
+ ret = PTR_ERR(t);
+ goto out_mput;
+ }
/*
* We keep the reference to the task struct even if
* the thread dies to avoid that the interrupt code
@@ -1095,6 +1101,8 @@ out_thread:
kthread_stop(t);
put_task_struct(t);
}
+out_mput:
+ module_put(desc->owner);
return ret;
}
@@ -1203,6 +1211,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
put_task_struct(action->thread);
}
+ module_put(desc->owner);
return action;
}