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genirq: Check irq_data_get_irq_chip() return value before use

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irq_data_get_irq_chip() can return NULL, however it is expected that this
never happens. If a buggy driver leads to NULL being returned from
irq_data_get_irq_chip(), warn about it instead of crashing the machine.

Signed-off-by: Marek Vasut <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>

To: [email protected]
This commit is contained in:
Marek Vasut authored and Thomas Gleixner committed 2020-05-28 15:58:04 +02:00
1 parent 9cb1fd0efd
commit 1d0326f352
1 file changed
+4
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kernel/irq/manage.c
+4
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@@ -2619,6 +2619,8 @@ int __irq_get_irqchip_state(struct irq_data *data, enum irqchip_irq_state which,
do {
chip = irq_data_get_irq_chip(data);
if (WARN_ON_ONCE(!chip))
return -ENODEV;
if (chip->irq_get_irqchip_state)
break;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
@@ -2696,6 +2698,8 @@ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
do {
chip = irq_data_get_irq_chip(data);
if (WARN_ON_ONCE(!chip))
return -ENODEV;
if (chip->irq_set_irqchip_state)
break;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY