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Subject[PATCH] genirq: Avoid NULL OOPS in irq handling
Date
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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