Mailing List Archive: call request_irq before or after hardware initialization?

On Fri, 2007-06-29 at 12:35 -0700, Li Juen Hwang wrote:
>
> Hi,
>
> Most 1394 drivers on Linux, ohci1394 for instance, calls
> request_irq() before
> initializing/enabling hardware chip. I'd like to reverse the order
> so that driver
> can exit the kernel without calling free_irq() if hardware failed.
> Is that ok?
> will it cause side effect? Thanks.

well you have to be able to handle interrupts the moment the hardware
will generate them... so the request_irq has to happen before that
point.

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