Re: SCSI aic7xxx driver: Initialization Failure over a kdump reboot

[Andrew Morton <akpm@osdl.org>]

Arjan van de Ven <arjan@infradead.org> wrote:
>
> On Thu, 2005-01-06 at 18:05 +0530, Vivek Goyal wrote:
>  > 
>  > In my machine Adaptec SCSI controller is not managing any devices. It
>  > is
>  > a lonely controller.
>  > 
> 
>  looks like the following is happening:
>  the controller wants to send an irq (probably from previous life)
>  then suddenly the driver gets loaded
>  * which registers an irq handler
>  * which does pci_enable_device()
>  and .. the irq goes through. 
>  the irq handler just is not yet expecting this irq, so
>  returns "uh dunno not mine"
>  the kernel then decides to disable the irq on the apic level
>  and then the driver DOES need an irq during init
>  ... which never happens.
> 

yes, that's exactly what e100 was doing on my laptop last month.  Fixed
that by arranging for the NIC to be reset before the call to
pci_set_master().

I expect the adaptec driver could be fixed by calling ahc_reset() from a
strategic place in either ahc_linux_pci_dev_probe() or in the shutdown
handler.  (Does the crashdump code call shutdown handlers?  Sounds like a
bad idea...)