On Monday 11 February 2008, Andi Kleen wrote:
quoted text
> 
> Without this patch a Opteron test system here oopses at boot with currentg git. 
> 
> Calling to_pci_dev() on a NULL pointer gives a negative value so the following NULL 
> pointer check never triggers and then an illegal address is referenced. Check the 
> unadjusted original device pointer for NULL instead.
> 
> Signed-off-by: Andi Kleen <ak@suse.de>

Thanks Andi!

This may explain+resolve ide_generic OOPS-es reported by Pavel/Kamalesh/Nish.

[ I also see that Linus has already merged the patch and you've followed
  up on pcibus_to_node() issue so there is nothing left for me to do...

  I really love when things turn out like this... ;) ]

quoted text
> Index: linux/include/linux/ide.h
> ===================================================================
> --- linux.orig/include/linux/ide.h
> +++ linux/include/linux/ide.h
> @@ -1294,7 +1294,7 @@ static inline void ide_dump_identify(u8 
>  static inline int hwif_to_node(ide_hwif_t *hwif)
>  {
>  	struct pci_dev *dev = to_pci_dev(hwif->dev);
> -	return dev ? pcibus_to_node(dev->bus) : -1;
> +	return hwif->dev ? pcibus_to_node(dev->bus) : -1;
>  }
>  
>  static inline ide_drive_t *ide_get_paired_drive(ide_drive_t *drive)
--
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