On Llu, 2006-05-15 at 17:18 -0700, Linus Torvalds wrote:
> The irq auto-detection should work with shared interrupts, but yes, it
> won't _detect_ them if they are already in use (but it's ok with them
> becoming shared later).
>
> That said, true ISA cards obviously won't ever have a shared irq, in any
> normal circumstances.
It really isn't that simple. ISAPnP and later ISA cards often allowed
the IRQ to be configured at runtime. Drivers doing this depend upon the
request_irq failing to decide which interrupt line to assign. The
resource management side of exclusive IRQ allocation is for better or
worse deeply embedded in the current interrupt design.
Alan
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