powerpc/eeh: Fix invalid cached PE primary bus

[Michael Ellerman]

On Fri, 2016-17-06 at 03:05:11 UTC, Gavin Shan wrote:
> The PE primary bus cannot be got from its child devices when having
> full hotplug in error recovery. The PE primary bus is cached, which
> is done in commit <05ba75f84864> ("powerpc/eeh: Fix stale cached primary
> bus"). In eeh_reset_device(), the flag (EEH_PE_PRI_BUS) is cleared
> before the PCI hot remove. eeh_pe_bus_get() then returns NULL as the
> PE primary bus in pnv_eeh_reset() and it crashes the kernel eventually.
> 
> This fixes the issue by clearing the flag (EEH_PE_PRI_BUS) before the
> PCI hot add. With it, the PowerNV EEH reset backend (pnv_eeh_reset())
> can get valid PE primary bus through eeh_pe_bus_get().
> 
> Fixes: 67086e32b564 ("powerpc/eeh: powerpc/eeh: Support error recovery for VF PE")
> Reported-by: Pridhiviraj Paidipeddi <ppaiddipe at in.ibm.com>
> Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/a3aa256b7258b3d19f8b44557c

cheers