ipr SATA support is causing problems

[Josh Boyer]

On Fri, 2006-11-10 at 22:37 +1100, Paul Mackerras wrote:
> Brian,
> 
> Today I compiled up a kernel from Linus' git tree and tried it on a
> POWER6 partition.  First I found that my config no longer had the ipr
> driver, because I didn't have CONFIG_ATA and ipr now depends on
> CONFIG_ATA.  So I enabled CONFIG_ATA without enabling any of the ATA
> chip drivers, which seems a little weird, and re-enabled ipr.
> 
> However, the kernel crashed on boot with a null pointer dereference in
> the ata code called from the ipr driver (see stack trace below).
> Other people have also reported such a crash.  I then reverted commit
> 35a39691e4, and the resulting kernel booted without crashing.

John Rose reported this a few days ago.  Brian responded with this:

http://marc.theaimsgroup.com/?l=linux-ide&m=116169938407596&w=2

josh