Devices, IRQs and handlers

Rajaram Suryanarayanan <rajaram_linux@xxxxxxxxx> · Sun, 8 Jan 2006 23:03:44 -0800 (PST)

Hi,

  I am confused about the mapping between devices, IRQs and the handlers. I am following Robert Love's "Linux Kernel Development" book.

  1. I see that different handlers can share the same IRQ with SA_SHIRQ flag. So does it mean there can be different interrupt handlers for the same device...? As I think each device has a unique IRQ ( strict 1-to-1 mapping between device and its IRQ ).

  2. Related to the first question, can different devices share the same IRQ ?

  3. Regarding dev_id parameter, is it unique to each device ? I mean is each device has a strict 1-to-1 mapping with dev_id ? 

  Please explain.

  Thanks,
  Rajaram.

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