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genirq: Check irq_data_get_irq_chip() return value before use
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 <marex@denx.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> To: linux-arm-kernel@lists.infradead.org
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@ -2619,6 +2619,8 @@ int __irq_get_irqchip_state(struct irq_data *data, enum irqchip_irq_state which,
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do {
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chip = irq_data_get_irq_chip(data);
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if (WARN_ON_ONCE(!chip))
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return -ENODEV;
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if (chip->irq_get_irqchip_state)
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break;
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#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
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@ -2696,6 +2698,8 @@ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
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do {
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chip = irq_data_get_irq_chip(data);
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if (WARN_ON_ONCE(!chip))
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return -ENODEV;
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if (chip->irq_set_irqchip_state)
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break;
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#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
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