request_irq called too soon ? What's the limit ?

request_irq called too soon ? What's the limit ?

[Sylvain Munaut]

Hello

I was wondering why some test ISR I put up didn't get called. Finally I
found out that the "enable" function of the interrupt controller was not
called. So the interrupt showed in /proc/interrupts with the good name /
number but was not enabled.

At which point may I call this function ? These calls where from the
setup_arch function.


Thanks,

    Sylvain

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Re: request_irq called too soon ? What's the limit ?

[Dan Malek]

On Aug 27, 2004, at 2:27 PM, Sylvain Munaut wrote:

> I was wondering why some test ISR I put up didn't get called. Finally I
> found out that the "enable" function of the interrupt controller was
> not
> called.

The interrupt is enabled when you call request_irq().

> At which point may I call this function ? These calls where from the
> setup_arch function.

That's too early.  Interrupts are expected to be installed from
device drivers, so calling it earlier than normal device set up
isn't likely to work and could vary from one kernel version
to another.  Just create some trivial driver that does the interrupt
set up for you.  You can't use it any earlier than that, anyway.


	-- Dan


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