Messages in this thread Patch in this message | | | From | Huacai Chen <> | Subject | [PATCH] genirq: Avoid NULL OOPS in irq handling | Date | Sat, 28 Sep 2013 10:11:24 +0800 |
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Some devices (e.g. serial port) setup irq handler at dev open and free it at dev close. So, sometimes there is no irqaction for a specific irq. But some buggy devices may send irqs at any time. This patch avoid the NULL OOPS when irqaction isn't registered.
Signed-off-by: Huacai Chen <chenhc@lemote.com> --- kernel/irq/handle.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 131ca17..1c78e69 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -135,6 +135,9 @@ handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action) irqreturn_t retval = IRQ_NONE; unsigned int flags = 0, irq = desc->irq_data.irq; + if (!action) + goto out; + do { irqreturn_t res; @@ -174,6 +177,7 @@ handle_irq_event_percpu(struct irq_desc *desc, struct irqaction *action) add_interrupt_randomness(irq, flags); +out: if (!noirqdebug) note_interrupt(irq, desc, retval); return retval; -- 1.7.7.3
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