[PATCH 1/1] powerpc/eeh: fix deadlock handling dead PHB

[Michael Ellerman]

On Fri, 2020-02-07 at 04:57:31 UTC, Sam Bobroff wrote:
> Recovering a dead PHB can currently cause a deadlock as the PCI
> rescan/remove lock is taken twice.
> 
> This is caused as part of an existing bug in
> eeh_handle_special_event(). The pe is processed while traversing the
> PHBs even though the pe is unrelated to the loop. This causes the pe
> to be, incorrectly, processed more than once.
> 
> Untangling this section can move the pe processing out of the loop and
> also outside the locked section, correcting both problems.
> 
> Signed-off-by: Sam Bobroff <sbobroff at linux.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/d4f194ed9eb9841a8f978710e4d24296f791a85b

cheers