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genirq: Warn if enable_irq is called before irq is set up 

The recent changes in the genirq core unearthed a bug in arch/um which
called enable_irq() before the interrupt was set up.

Warn and return instead of crashing the machine with a NULL pointer
dereference.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Weinberger <richard@nod.at>
This commit is contained in:
Thomas Gleixner 2010-10-22 14:47:57 +02:00
parent d4429f608a
commit 2656c36699
1 changed files with 4 additions and 0 deletions
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4
kernel/irq/manage.c
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@ -324,6 +324,10 @@ void enable_irq(unsigned int irq)
if (!desc)
return;
if (WARN(!desc->irq_data.chip || !desc->irq_data.chip->irq_enable,
KERN_ERR "enable_irq before setup/request_irq: irq %u\n", irq))
return;
chip_bus_lock(desc);
raw_spin_lock_irqsave(&desc->lock, flags);
__enable_irq(desc, irq, false);